1 vecka sedan · f9c0a69c24
--- a/.env.example
+++ b/.env.example
@@ -36,3 +36,22 @@ LOG_TO_FILE=true
 
				 # also store the value separately (otherwise an encrypted backup cannot be
			
 
				 # restored after key loss).
			
 
				 # MFA_ENCRYPTION_KEY=
			
 
				+
			
 
				+# External library folders (GHSA-r2qv follow-up) — colon-separated list of
			
 
				+# host paths that users are permitted to register as external library
			
 
				+# folders via Settings → Library → "Add external folder".
			
 
				+#
			
 
				+# Empty (the default) means the external-folder feature is DISABLED:
			
 
				+# attempts to register one return HTTP 400. Set this to one or more
			
 
				+# absolute paths to opt in. Paths that fall inside Bambuddy's own
			
 
				+# DATA_DIR / LOG_DIR / static dir are always rejected regardless of
			
 
				+# this value.
			
 
				+#
			
 
				+# Example for a single NAS mount:
			
 
				+#   BAMBUDDY_EXTERNAL_ROOTS=/mnt/nas/3d-prints
			
 
				+# Example for two roots:
			
 
				+#   BAMBUDDY_EXTERNAL_ROOTS=/mnt/nas/3d-prints:/srv/library
			
 
				+#
			
 
				+# In Docker, also bind-mount the host path into the container at the same
			
 
				+# location (see docker-compose.yml for the matching volume snippet).
			
 
				+# BAMBUDDY_EXTERNAL_ROOTS=
			
--- a/.gitignore
+++ b/.gitignore
@@ -62,6 +62,11 @@ node_modules/
 
				 
			
 
				 data/
			
 
				 
			
 
				+# Local-dev runtime caches (matplotlib MPLCONFIGDIR lands here when DATA_DIR
			
 
				+# is unset, so base_dir resolves to the repo root). In Docker this sits
			
 
				+# inside the /app/data volume and is already covered.
			
 
				+.cache/
			
 
				+
			
 
				 # JWT secret file (should be in data dir, but protect project root too)
			
 
				 .jwt_secret
			
 
				 
			
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -81,11 +81,108 @@ The following are **out of scope**:
 
				 - Denial of service (DoS) attacks
			
 
				 - Issues requiring physical access to the server
			
 
				 
			
 
				-## Acknowledgments
			
 
				-
			
 
				-We thank the following individuals for responsibly disclosing security issues:
			
 
				-
			
 
				-*No security issues have been reported yet.*
			
 
				+## Bambuddy Security Stance
			
 
				+
			
 
				+The following rules apply to every PR that touches authentication,
			
 
				+authorization, permission gating, secret handling, or any code that
			
 
				+decides whether to allow or deny an action. They are not aspirational —
			
 
				+each one is enforced by a CI test that fails the build on violation.
			
 
				+
			
 
				+### 1. Default-deny, allowlist over denylist
			
 
				+
			
 
				+At any security boundary, the safe default is to deny and the
			
 
				+exceptions are listed explicitly. Denylists fail open on growth — every
			
 
				+new resource added to the codebase is implicitly granted access until
			
 
				+someone remembers to deny it. Allowlists fail closed: an unmapped new
			
 
				+resource gets a 403, which is loud and recoverable.
			
 
				+
			
 
				+Concretely:
			
 
				+
			
 
				+- `_APIKEY_SCOPE_BY_PERMISSION` in `backend/app/core/auth.py` is the
			
 
				+  load-bearing API-key authorization map. Every `Permission` enum value
			
 
				+  must be either present here with a scope flag, or present in
			
 
				+  `_APIKEY_DENIED_PERMISSIONS`. Unmapped permissions return 403.
			
 
				+- Route auth dependencies are explicit, not implicit. A route without a
			
 
				+  `Depends(require_*)` decorator must be listed in the route-audit
			
 
				+  `PUBLIC_ROUTES` allowlist with a justification comment, or CI fails.
			
 
				+
			
 
				+### 2. Fail-closed in auth code
			
 
				+
			
 
				+No `except Exception:` (or bare `except:`) in authentication,
			
 
				+authorization, or permission code may return a permissive value
			
 
				+(`None`, `True`, an admin user, an empty filter that lets everything
			
 
				+through, etc.). The catch-all either re-raises or returns a denial.
			
 
				+This is CWE-636 "Not Failing Securely" — see
			
 
				+<https://cwe.mitre.org/data/definitions/636.html>.
			
 
				+
			
 
				+The lint scope is `backend/app/core/auth.py`,
			
 
				+`backend/app/core/permissions.py`,
			
 
				+`backend/app/api/routes/auth*.py`. Any `except Exception:` block in
			
 
				+those files must be tagged `# SEC-AUTH-EXC: <reason>` on the same
			
 
				+line; CI fails otherwise. (We use a standalone marker rather than
			
 
				+`# noqa: ...` because ruff reserves the latter syntax for its own
			
 
				+error codes.)
			
 
				+
			
 
				+### 3. No hardcoded fallback secrets
			
 
				+
			
 
				+Production secrets (JWT signing keys, encryption keys, OAuth client
			
 
				+secrets, API tokens) have no string-literal fallback in source. The
			
 
				+codebase reads them from env vars or generates them on first run; if a
			
 
				+secret is missing AND cannot be generated, the app refuses to start
			
 
				+rather than booting with a known value. CI greps the source for
			
 
				+`-change-in-production`-shaped strings and fails on any hit.
			
 
				+
			
 
				+### 4. Negative-path tests required for any auth change
			
 
				+
			
 
				+Any PR that adds or modifies an auth dependency, permission check, or
			
 
				+scope flag includes tests for the negative paths:
			
 
				+
			
 
				+- "No credentials → 401"
			
 
				+- "Wrong credentials → 401"
			
 
				+- "Right credentials, wrong scope → 403"
			
 
				+- "Expired / revoked credentials → 401"
			
 
				+
			
 
				+A test asserting the happy path passes is necessary but not sufficient.
			
 
				+The failure modes are where the vulnerabilities live. The structural
			
 
				+backstops above catch *categories* of regression; the negative-path
			
 
				+tests catch *specific* regressions in the new code.
			
 
				+
			
 
				+### 5. Path joins under a trusted parent use the safe-join helper
			
 
				+
			
 
				+Anywhere a Bambuddy code path joins a string from outside the function's
			
 
				+scope (request body, query/path param, `UploadFile.filename`, ZIP
			
 
				+`namelist()` entry, tarfile member, **printer FTP-listing entry**) under
			
 
				+a trusted directory, the join must route through
			
 
				+`backend.app.utils.safe_path.safe_join_under(parent, *parts)`. The helper
			
 
				+resolves the joined path and asserts it is a descendant of the parent —
			
 
				+defeating both absolute-path collapse (`Path("/a") / "/b"` → `Path("/b")`)
			
 
				+and `..` traversal.
			
 
				+
			
 
				+Sites that have an inline guard (an explicit resolve + `is_relative_to`,
			
 
				+a basename-stripping helper like `_safe_filename`, or a pre-validated
			
 
				+alphanumeric filter) carry a `# SEC-PATH-OK: <reason>` marker on the
			
 
				+same line. CI walks **both** `backend/app/api/routes/` and
			
 
				+`backend/app/services/` and fails the build on any
			
 
				+``<dir-like> / <variable>`` join without either the helper or the
			
 
				+marker. The services layer is in scope because it receives values from
			
 
				+the routes verbatim and from external sources Bambuddy has no control
			
 
				+over (the compromised-printer threat model: a malicious printer can
			
 
				+serve crafted FTP-listing entries that flow straight into a path join).
			
 
				+
			
 
				+### Where these rules live in the codebase
			
 
				+
			
 
				+| Rule | Enforcement | Location |
			
 
				+|------|-------------|----------|
			
 
				+| 1. Allowlist over denylist (Permission) | `test_every_permission_has_a_classification` | `backend/tests/integration/test_auth_apikey_rbac.py` |
			
 
				+| 1. Allowlist over denylist (routes) | `test_routes_have_explicit_auth_deps` | `backend/tests/unit/test_route_auth_coverage.py` |
			
 
				+| 2. Fail-closed in auth code | `test_no_fail_open_in_auth_modules` | `backend/tests/unit/test_no_fail_open_in_auth.py` |
			
 
				+| 3. No hardcoded fallback secrets | `test_no_hardcoded_secrets` | `backend/tests/unit/test_no_hardcoded_secrets.py` |
			
 
				+| 4. Negative-path tests required | Reviewer responsibility (no automated CI gate yet) | PR review |
			
 
				+| 5. Safe-join under trusted parent | `test_route_path_arithmetic_is_safe_joined_or_marked` | `backend/tests/unit/test_no_unsafe_path_joins.py` |
			
 
				+
			
 
				+If you are adding a CI rule, update this table. If you are removing a
			
 
				+CI rule, you are removing a security backstop and the PR description
			
 
				+must explain why.
			
 
				 
			
 
				 ---
			
 
				 
			
--- a/backend/app/api/routes/api_keys.py
+++ b/backend/app/api/routes/api_keys.py
@@ -63,6 +63,8 @@ async def create_api_key(
 
				         can_queue=data.can_queue,
			
 
				         can_control_printer=data.can_control_printer,
			
 
				         can_read_status=data.can_read_status,
			
 
				+        can_manage_library=data.can_manage_library,
			
 
				+        can_manage_inventory=data.can_manage_inventory,
			
 
				         can_access_cloud=data.can_access_cloud,
			
 
				         can_update_energy_cost=data.can_update_energy_cost,
			
 
				         printer_ids=data.printer_ids,
			
@@ -82,6 +84,8 @@ async def create_api_key(
 
				         can_queue=api_key.can_queue,
			
 
				         can_control_printer=api_key.can_control_printer,
			
 
				         can_read_status=api_key.can_read_status,
			
 
				+        can_manage_library=api_key.can_manage_library,
			
 
				+        can_manage_inventory=api_key.can_manage_inventory,
			
 
				         can_access_cloud=api_key.can_access_cloud,
			
 
				         can_update_energy_cost=api_key.can_update_energy_cost,
			
 
				         printer_ids=api_key.printer_ids,
			
@@ -131,6 +135,10 @@ async def update_api_key(
 
				         api_key.can_control_printer = data.can_control_printer
			
 
				     if data.can_read_status is not None:
			
 
				         api_key.can_read_status = data.can_read_status
			
 
				+    if data.can_manage_library is not None:
			
 
				+        api_key.can_manage_library = data.can_manage_library
			
 
				+    if data.can_manage_inventory is not None:
			
 
				+        api_key.can_manage_inventory = data.can_manage_inventory
			
 
				     if data.can_access_cloud is not None:
			
 
				         # Same constraint as create — flipping cloud access on a legacy key
			
 
				         # without an owner would be silently broken; reject at the route layer.
			
--- a/backend/app/api/routes/archives.py
+++ b/backend/app/api/routes/archives.py
@@ -30,6 +30,7 @@ from backend.app.schemas.print_log import PrintLogResponse
 
				 from backend.app.schemas.slicer import SliceRequest
			
 
				 from backend.app.services.archive import ArchiveService
			
 
				 from backend.app.utils.http import build_content_disposition
			
 
				+from backend.app.utils.safe_path import safe_join_under
			
 
				 from backend.app.utils.threemf_tools import (
			
 
				     extract_embedded_presets_from_3mf,
			
 
				     extract_nozzle_mapping_from_3mf,
			
@@ -148,7 +149,7 @@ def _apply_run_user_filter(conditions: list, created_by_id: int | None):
 
				             conditions.append(PrintLogEntry.created_by_id == created_by_id)
			
 
				 
			
 
				 
			
 
				-def compute_time_accuracy(archive: PrintArchive) -> dict:
			
 
				+def compute_time_accuracy(archive: PrintArchive, run_aggregate: dict | None = None) -> dict:
			
 
				     """Compute actual print time and accuracy for an archive.
			
 
				 
			
 
				     Returns dict with actual_time_seconds and time_accuracy.
			
@@ -156,8 +157,26 @@ def compute_time_accuracy(archive: PrintArchive) -> dict:
 
				     - 100% = perfect estimate
			
 
				     - >100% = print was faster than estimated
			
 
				     - <100% = print took longer than estimated
			
 
				+
			
 
				+    When ``run_aggregate`` indicates the archive has more than one logged
			
 
				+    run (multi-plate file printed plate-by-plate, or reprints), both
			
 
				+    fields are suppressed: ``archive.started_at / completed_at`` reflect
			
 
				+    the LATEST run only, while ``archive.print_time_seconds`` is the
			
 
				+    whole-file estimate (post-#1593 the parser sums across plates), so
			
 
				+    comparing the two describes different scopes. The card-rendering
			
 
				+    frontend falls through to ``archive.print_time_seconds`` for the
			
 
				+    time display and hides the badge when ``time_accuracy`` is null —
			
 
				+    that's the desired "show estimate, no badge" presentation for
			
 
				+    multi-run archives (#1608). Single-run archives keep the original
			
 
				+    badge behaviour verbatim.
			
 
				     """
			
 
				-    result = {"actual_time_seconds": None, "time_accuracy": None}
			
 
				+    result: dict[str, int | float | None] = {"actual_time_seconds": None, "time_accuracy": None}
			
 
				+
			
 
				+    # Multi-run archives: the per-run actual (started_at..completed_at on
			
 
				+    # the archive row) is incommensurable with the whole-file estimate.
			
 
				+    # Both fields are cleared so the card shows estimate + no badge.
			
 
				+    if run_aggregate and (run_aggregate.get("run_count") or 0) > 1:
			
 
				+        return result
			
 
				 
			
 
				     if archive.started_at and archive.completed_at and archive.status == "completed":
			
 
				         actual_seconds = int((archive.completed_at - archive.started_at).total_seconds())
			
@@ -270,8 +289,11 @@ def archive_to_response(
 
				         "created_by_username": archive.created_by.username if archive.created_by else None,
			
 
				     }
			
 
				 
			
 
				-    # Add computed time accuracy fields
			
 
				-    accuracy_data = compute_time_accuracy(archive)
			
 
				+    # Add computed time accuracy fields. ``run_aggregate`` lets
			
 
				+    # ``compute_time_accuracy`` suppress the badge for multi-run archives
			
 
				+    # where the per-run actual / whole-file estimate scopes don't match
			
 
				+    # (#1608).
			
 
				+    accuracy_data = compute_time_accuracy(archive, run_aggregate)
			
 
				     data.update(accuracy_data)
			
 
				 
			
 
				     if run_aggregate:
			
@@ -579,7 +601,10 @@ async def search_archives(
 
				         query = query.limit(limit).offset(offset)
			
 
				         result = await db.execute(query)
			
 
				         archives = result.scalars().all()
			
 
				-        return [archive_to_response(a) for a in archives]
			
 
				+        # Load run aggregates so multi-run archives' time/accuracy badge is
			
 
				+        # suppressed consistently with the main list endpoint (#1608).
			
 
				+        run_aggregates = await _load_run_aggregates(db, [a.id for a in archives])
			
 
				+        return [archive_to_response(a, run_aggregate=run_aggregates.get(a.id)) for a in archives]
			
 
				 
			
 
				     if not matched_ids:
			
 
				         return []
			
@@ -606,7 +631,10 @@ async def search_archives(
 
				     ordered_archives = [archives_dict[id] for id in matched_ids if id in archives_dict]
			
 
				     paginated = ordered_archives[offset : offset + limit]
			
 
				 
			
 
				-    return [archive_to_response(a) for a in paginated]
			
 
				+    # Load run aggregates so multi-run archives' time/accuracy badge is
			
 
				+    # suppressed consistently with the main list endpoint (#1608).
			
 
				+    run_aggregates = await _load_run_aggregates(db, [a.id for a in paginated])
			
 
				+    return [archive_to_response(a, run_aggregate=run_aggregates.get(a.id)) for a in paginated]
			
 
				 
			
 
				 
			
 
				 @router.post("/search/rebuild-index")
			
@@ -865,10 +893,23 @@ async def get_archive_stats(
 
				     successful_prints = successful_result.scalar() or 0
			
 
				 
			
 
				     failed_result = await db.execute(
			
 
				-        select(func.count(PrintLogEntry.id)).where(PrintLogEntry.status == "failed", *base_conditions)
			
 
				+        select(func.count(PrintLogEntry.id)).where(PrintLogEntry.status.in_(("failed", "aborted")), *base_conditions)
			
 
				     )
			
 
				     failed_prints = failed_result.scalar() or 0
			
 
				 
			
 
				+    # User/system-stopped prints — stopped/cancelled/skipped are distinct from
			
 
				+    # quality failures: the user (or the queue) interrupted them, the printer
			
 
				+    # didn't detect a fault. Bucketed separately so the Success Rate gauge
			
 
				+    # divides by completed + failed only (a cancelled print shouldn't drag
			
 
				+    # the gauge down), while still being visible in the breakdown so they
			
 
				+    # don't silently vanish from Total Prints (#1390).
			
 
				+    cancelled_result = await db.execute(
			
 
				+        select(func.count(PrintLogEntry.id)).where(
			
 
				+            PrintLogEntry.status.in_(("stopped", "cancelled", "skipped")), *base_conditions
			
 
				+        )
			
 
				+    )
			
 
				+    cancelled_prints = cancelled_result.scalar() or 0
			
 
				+
			
 
				     # Total elapsed time — PrintLogEntry stores duration_seconds directly so we
			
 
				     # can sum it server-side. Rows missing duration fall back to the slicer
			
 
				     # estimate from the archive (joined for that case only).
			
@@ -934,6 +975,23 @@ async def get_archive_stats(
 
				             *base_conditions,
			
 
				         )
			
 
				     )
			
 
				+    # Accuracy is meaningful only when the estimate roughly describes the
			
 
				+    # work the run actually performed. Two shapes produce wildly-off ratios
			
 
				+    # that are pure noise:
			
 
				+    #   - multi-plate ``.gcode.3mf`` printed plate-by-plate: each run's
			
 
				+    #     actual is one plate, the archive's estimate is the sum across
			
 
				+    #     plates (post-#1593 parser fix), so the ratio is roughly N×100%
			
 
				+    #     for an N-plate file. Pre-fix this shape was also broken, just
			
 
				+    #     less dramatically — the estimate was plate-1-only so the ratio
			
 
				+    #     was meaningless rather than N×.
			
 
				+    #   - manual interventions / purge waste blowing the actual far past
			
 
				+    #     the estimate.
			
 
				+    # Clamp to the [50%, 200%] band so the printer-level average reflects
			
 
				+    # real slicer-vs-reality drift, not multi-plate accounting or one-off
			
 
				+    # outliers. Single-plate archives — the case the metric is actually
			
 
				+    # designed for — stay fully included.
			
 
				+    _ACCURACY_BAND_LO = 50.0
			
 
				+    _ACCURACY_BAND_HI = 200.0
			
 
				     average_accuracy = None
			
 
				     accuracy_by_printer: dict[str, float] = {}
			
 
				     accuracies: list[float] = []
			
@@ -946,6 +1004,8 @@ async def get_archive_stats(
 
				         if not actual_seconds or not estimate_seconds:
			
 
				             continue
			
 
				         accuracy = (estimate_seconds / actual_seconds) * 100
			
 
				+        if accuracy < _ACCURACY_BAND_LO or accuracy > _ACCURACY_BAND_HI:
			
 
				+            continue
			
 
				         accuracies.append(accuracy)
			
 
				         printer_key = str(run_printer_id) if run_printer_id else "unknown"
			
 
				         printer_accuracies.setdefault(printer_key, []).append(accuracy)
			
@@ -990,6 +1050,7 @@ async def get_archive_stats(
 
				         total_prints=total_prints,
			
 
				         successful_prints=successful_prints,
			
 
				         failed_prints=failed_prints,
			
 
				+        cancelled_prints=cancelled_prints,
			
 
				         total_print_time_hours=round(total_time, 1),
			
 
				         total_filament_grams=round(total_filament, 1),
			
 
				         total_cost=round(total_cost, 2),
			
@@ -1382,7 +1443,11 @@ async def update_archive(
 
				     )
			
 
				     archive = result.scalar_one_or_none()
			
 
				 
			
 
				-    return archive_to_response(archive)
			
 
				+    # Load run aggregate so the time/accuracy badge stays consistent with
			
 
				+    # the list / detail endpoints when the frontend re-renders the card
			
 
				+    # after a PATCH (#1608).
			
 
				+    run_aggregates = await _load_run_aggregates(db, [archive.id]) if archive else {}
			
 
				+    return archive_to_response(archive, run_aggregate=run_aggregates.get(archive.id) if archive else None)
			
 
				 
			
 
				 
			
 
				 @router.post("/{archive_id}/favorite", response_model=ArchiveResponse)
			
@@ -2359,7 +2424,7 @@ async def process_timelapse(
 
				                 filename = f"timelapse_{archive_id}_edited"
			
 
				             if not filename.endswith(".mp4"):
			
 
				                 filename += ".mp4"
			
 
				-            output_path = archive_dir / filename
			
 
				+            output_path = archive_dir / filename  # SEC-PATH-OK: filename alnum-filtered + .. rejected above
			
 
				 
			
 
				         success = await processor.process(
			
 
				             output_path=output_path,
			
@@ -2430,7 +2495,7 @@ async def upload_photo(
 
				 
			
 
				     ext = Path(file.filename).suffix.lower()
			
 
				     photo_filename = f"{uuid.uuid4().hex[:8]}{ext}"
			
 
				-    photo_path = photos_dir / photo_filename
			
 
				+    photo_path = photos_dir / photo_filename  # SEC-PATH-OK: photo_filename = uuid.uuid4().hex[:8] + ext
			
 
				 
			
 
				     # Save file
			
 
				     content = await file.read()
			
@@ -2463,8 +2528,20 @@ async def get_photo(
 
				     if not archive:
			
 
				         raise HTTPException(404, "Archive not found")
			
 
				 
			
 
				+    # Membership check first — UUID-generated names on upload mean any URL
			
 
				+    # filename that doesn't appear here is by definition not a real photo.
			
 
				+    # Mirrors the delete handler below; previously this endpoint had no
			
 
				+    # membership check at all and joined `filename` straight to disk.
			
 
				+    if not archive.photos or filename not in archive.photos:
			
 
				+        raise HTTPException(404, "Photo not found")
			
 
				+
			
 
				     archive_dir = settings.base_dir / Path(archive.file_path).parent
			
 
				-    photo_path = archive_dir / "photos" / filename
			
 
				+    photos_dir = archive_dir / "photos"
			
 
				+    # Defence-in-depth: even though the membership check above already
			
 
				+    # constrains `filename` to UUID-generated names from upload, the
			
 
				+    # resolve + containment check guards against future code paths that
			
 
				+    # might populate `archive.photos` from a less-trusted source.
			
 
				+    photo_path = safe_join_under(photos_dir, filename)
			
 
				 
			
 
				     if not photo_path.exists():
			
 
				         raise HTTPException(404, "Photo not found")
			
@@ -2498,9 +2575,10 @@ async def delete_photo(
 
				     if not archive.photos or filename not in archive.photos:
			
 
				         raise HTTPException(404, "Photo not found")
			
 
				 
			
 
				-    # Delete file
			
 
				+    # Delete file — same defence-in-depth as get_photo above.
			
 
				     archive_dir = settings.base_dir / Path(archive.file_path).parent
			
 
				-    photo_path = archive_dir / "photos" / filename
			
 
				+    photos_dir = archive_dir / "photos"
			
 
				+    photo_path = safe_join_under(photos_dir, filename)
			
 
				     if photo_path.exists():
			
 
				         photo_path.unlink()
			
 
				 
			
@@ -2946,7 +3024,9 @@ async def upload_archive(
 
				 
			
 
				     # Save uploaded file temporarily — strip directory components to prevent path traversal
			
 
				     safe_filename = _safe_filename(file.filename)
			
 
				-    temp_path = settings.archive_dir / "temp" / safe_filename
			
 
				+    temp_path = (
			
 
				+        settings.archive_dir / "temp" / safe_filename
			
 
				+    )  # SEC-PATH-OK: safe_filename = _safe_filename(...) basename-stripped above
			
 
				     temp_path.parent.mkdir(parents=True, exist_ok=True)
			
 
				 
			
 
				     try:
			
@@ -2994,7 +3074,9 @@ async def upload_archives_bulk(
 
				             continue
			
 
				 
			
 
				         safe_filename = _safe_filename(file.filename)
			
 
				-        temp_path = settings.archive_dir / "temp" / safe_filename
			
 
				+        temp_path = (
			
 
				+            settings.archive_dir / "temp" / safe_filename
			
 
				+        )  # SEC-PATH-OK: safe_filename = _safe_filename(...) basename-stripped above
			
 
				         temp_path.parent.mkdir(parents=True, exist_ok=True)
			
 
				 
			
 
				         try:
			
@@ -3625,7 +3707,9 @@ async def slice_archive(
 
				             detail="Archive has no source file to slice",
			
 
				         )
			
 
				 
			
 
				-    src_path = Path(settings.base_dir) / src_relative
			
 
				+    src_path = (
			
 
				+        Path(settings.base_dir) / src_relative
			
 
				+    )  # SEC-PATH-OK: src_relative is archive.source_3mf_path from DB, set by _resolve_source_3mf_path which already does resolve+relative_to containment
			
 
				     if not src_path.exists():
			
 
				         raise HTTPException(status_code=404, detail="Archive source file missing on disk")
			
 
				 
			
@@ -3891,6 +3975,53 @@ async def get_project_image(
 
				 # =============================================================================
			
 
				 
			
 
				 
			
 
				+def _resolve_source_3mf_path(archive: PrintArchive, source_filename: str) -> Path:
			
 
				+    """Resolve where to write a source 3MF for ``archive``.
			
 
				+
			
 
				+    Normal archives nest the source under ``<archive_file_dir>/source/``.
			
 
				+    "Fallback" archives (created in main.py when MQTT reports a print start
			
 
				+    but Bambuddy never saw the source 3MF — cloud / Handy / pre-existing
			
 
				+    SD-card prints) carry ``file_path=""``. Joining that with ``base_dir``
			
 
				+    via the ``/`` operator silently yields ``base_dir`` itself, whose parent
			
 
				+    is ``base_dir.parent`` — which sent the upload to ``/app/source/`` and
			
 
				+    raised a 500 on the final ``relative_to`` (#1531). Fallback archives
			
 
				+    now land under ``<base_dir>/archive/no_source/<archive_id>/`` instead,
			
 
				+    which stays inside the data volume and remains addressable by every
			
 
				+    read site that does ``base_dir / archive.source_3mf_path``.
			
 
				+
			
 
				+    The resolved directory is asserted to be inside ``base_dir`` even when
			
 
				+    ``archive.file_path`` is populated, so a row corrupted by an old import
			
 
				+    or manual SQL edit fails with a clear 500 instead of writing outside
			
 
				+    the data volume.
			
 
				+    """
			
 
				+    if archive.file_path:
			
 
				+        archive_file = settings.base_dir / archive.file_path
			
 
				+        source_dir = archive_file.parent / "source"
			
 
				+    else:
			
 
				+        source_dir = settings.base_dir / "archive" / "no_source" / str(archive.id)
			
 
				+
			
 
				+    # Containment check via resolve() — catches absolute file_path, `..`
			
 
				+    # traversal, and any other shape that escapes the data volume — but we
			
 
				+    # return the *literal* source_dir below. Resolving the returned path
			
 
				+    # would canonicalise away a symlinked DATA_DIR (legitimate on TrueNAS /
			
 
				+    # QNAP / Synology storage pools, and any `-v /symlink:/app/data`
			
 
				+    # mount), which would then make the caller's
			
 
				+    # ``source_path.relative_to(settings.base_dir)`` raise because the
			
 
				+    # left side is canonical and the right is the symlink path.
			
 
				+    try:
			
 
				+        source_dir.resolve().relative_to(settings.base_dir.resolve())
			
 
				+    except ValueError as exc:
			
 
				+        raise HTTPException(
			
 
				+            500,
			
 
				+            f"Archive {archive.id} resolves to a path outside the data directory; cannot attach source.",
			
 
				+        ) from exc
			
 
				+
			
 
				+    source_dir.mkdir(parents=True, exist_ok=True)
			
 
				+    return (
			
 
				+        source_dir / source_filename
			
 
				+    )  # SEC-PATH-OK: callers pass _safe_filename(...) basename-stripped; source_dir resolve+relative_to checked above
			
 
				+
			
 
				+
			
 
				 @router.post("/{archive_id}/source")
			
 
				 async def upload_source_3mf(
			
 
				     archive_id: int,
			
@@ -3907,11 +4038,9 @@ async def upload_source_3mf(
 
				     if not file.filename or not file.filename.endswith(".3mf"):
			
 
				         raise HTTPException(400, "File must be a .3mf file")
			
 
				 
			
 
				-    # Get archive directory and create source subdirectory
			
 
				-    file_path = settings.base_dir / archive.file_path
			
 
				-    archive_dir = file_path.parent
			
 
				-    source_dir = archive_dir / "source"
			
 
				-    source_dir.mkdir(exist_ok=True)
			
 
				+    # Save the source 3MF file - preserve original filename, strip directory components
			
 
				+    source_filename = _safe_filename(file.filename)
			
 
				+    source_path = _resolve_source_3mf_path(archive, source_filename)
			
 
				 
			
 
				     # Delete old source file if exists
			
 
				     if archive.source_3mf_path:
			
@@ -3919,10 +4048,6 @@ async def upload_source_3mf(
 
				         if old_source_path.exists():
			
 
				             old_source_path.unlink()
			
 
				 
			
 
				-    # Save the source 3MF file - preserve original filename, strip directory components
			
 
				-    source_filename = _safe_filename(file.filename)
			
 
				-    source_path = source_dir / source_filename
			
 
				-
			
 
				     content = await file.read()
			
 
				     # #1401: validate zip header on source 3MF uploads too — source files
			
 
				     # are uploaded for reprint and slicing, so an invalid one breaks the
			
@@ -4114,11 +4239,9 @@ async def upload_source_3mf_by_name(
 
				     if not archive:
			
 
				         raise HTTPException(404, f"No archive found matching '{print_name}'")
			
 
				 
			
 
				-    # Get archive directory and create source subdirectory
			
 
				-    file_path = settings.base_dir / archive.file_path
			
 
				-    archive_dir = file_path.parent
			
 
				-    source_dir = archive_dir / "source"
			
 
				-    source_dir.mkdir(exist_ok=True)
			
 
				+    # Save the source 3MF file - preserve original filename, strip directory components
			
 
				+    source_filename = safe_filename
			
 
				+    source_path = _resolve_source_3mf_path(archive, source_filename)
			
 
				 
			
 
				     # Delete old source file if exists
			
 
				     if archive.source_3mf_path:
			
@@ -4126,10 +4249,6 @@ async def upload_source_3mf_by_name(
 
				         if old_source_path.exists():
			
 
				             old_source_path.unlink()
			
 
				 
			
 
				-    # Save the source 3MF file - preserve original filename, strip directory components
			
 
				-    source_filename = safe_filename
			
 
				-    source_path = source_dir / source_filename
			
 
				-
			
 
				     content = await file.read()
			
 
				     # #1401: same zip-header check as the other upload routes — the
			
 
				     # match-by-name endpoint is used by slicer post-processing scripts,
			
@@ -4215,7 +4334,7 @@ async def upload_f3d(
 
				 
			
 
				     # Save the F3D file - preserve original filename, strip directory components
			
 
				     f3d_filename = _safe_filename(file.filename)
			
 
				-    f3d_path = f3d_dir / f3d_filename
			
 
				+    f3d_path = f3d_dir / f3d_filename  # SEC-PATH-OK: f3d_filename = _safe_filename(...) basename-stripped above
			
 
				 
			
 
				     content = await file.read()
			
 
				     f3d_path.write_bytes(content)
			
--- a/backend/app/api/routes/auth.py
+++ b/backend/app/api/routes/auth.py
@@ -25,6 +25,7 @@ from backend.app.core.auth import (
 
				     authenticate_user,
			
 
				     authenticate_user_by_email,
			
 
				     create_access_token,
			
 
				+    create_websocket_token,
			
 
				     get_current_active_user,
			
 
				     get_password_hash,
			
 
				     get_user_by_email,
			
@@ -273,7 +274,7 @@ async def setup_auth(request: SetupRequest, db: AsyncSession = Depends(get_db)):
 
				                     db.add(admin_user)
			
 
				                     logger.info("Admin user added to session: %s", request.admin_username)
			
 
				                     admin_created = True
			
 
				-                except Exception as e:
			
 
				+                except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); no user is created on error
			
 
				                     await db.rollback()
			
 
				                     logger.error("Failed to create admin user: %s", e, exc_info=True)
			
 
				                     raise HTTPException(
			
@@ -294,7 +295,7 @@ async def setup_auth(request: SetupRequest, db: AsyncSession = Depends(get_db)):
 
				         return SetupResponse(auth_enabled=request.auth_enabled, admin_created=admin_created)
			
 
				     except HTTPException:
			
 
				         raise
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); setup state stays unchanged
			
 
				         logger.error("Setup error: %s", e, exc_info=True)
			
 
				         await db.rollback()
			
 
				         raise HTTPException(
			
@@ -339,7 +340,7 @@ async def disable_auth(
 
				         await db.commit()
			
 
				         logger.info("Authentication disabled by admin user: %s", user.username)
			
 
				         return {"message": "Authentication disabled successfully", "auth_enabled": False}
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); auth_enabled stays at its prior value
			
 
				         await db.rollback()
			
 
				         logger.error("Failed to disable authentication: %s", e, exc_info=True)
			
 
				         raise HTTPException(
			
@@ -408,7 +409,7 @@ async def login(raw_request: Request, request: LoginRequest, response: Response,
 
				                     if user and ldap_user:
			
 
				                         # Update email and group mappings on each login
			
 
				                         await _sync_ldap_user(db, user, ldap_user, ldap_config)
			
 
				-        except Exception as e:
			
 
				+        except Exception as e:  # SEC-AUTH-EXC: LDAP failure sets ldap_user=None, downstream local-auth path runs with its own credential check (no implicit grant)
			
 
				             import logging
			
 
				 
			
 
				             logging.getLogger(__name__).warning("LDAP authentication error, falling back to local: %s", e)
			
@@ -505,6 +506,29 @@ async def login(raw_request: Request, request: LoginRequest, response: Response,
 
				     )
			
 
				 
			
 
				 
			
 
				+@router.post("/ws-token")
			
 
				+async def mint_websocket_token(
			
 
				+    current_user: User | None = RequirePermissionIfAuthEnabled(Permission.WEBSOCKET_CONNECT),
			
 
				+):
			
 
				+    """Mint a short-lived token for ``/api/v1/ws`` connections (GHSA-r2qv follow-up).
			
 
				+
			
 
				+    The WebSocket endpoint cannot read ``Authorization`` headers from
			
 
				+    browsers (the WebSocket handshake does not let JS attach custom
			
 
				+    headers), so we use the same opaque-token-in-query-param pattern
			
 
				+    as ``/camera/stream`` — the token is minted here behind the standard
			
 
				+    permission gate, then appended as ``?token=<value>`` on the
			
 
				+    ``ws://...`` URL. The WebSocket endpoint validates it *before*
			
 
				+    calling ``websocket.accept()``.
			
 
				+
			
 
				+    Returns ``{"token": <opaque string>}``. The token is valid for 60
			
 
				+    minutes; the SPA refreshes it on reconnect if expired. API keys can
			
 
				+    mint tokens too — their scope flags decide whether ``WEBSOCKET_CONNECT``
			
 
				+    passes via the standard allowlist (``can_read_status`` covers it).
			
 
				+    """
			
 
				+    username = current_user.username if current_user is not None else None
			
 
				+    return {"token": await create_websocket_token(username)}
			
 
				+
			
 
				+
			
 
				 @router.get("/me", response_model=UserResponse)
			
 
				 async def get_current_user_info(
			
 
				     credentials: Annotated[HTTPAuthorizationCredentials | None, Depends(security)] = None,
			
@@ -619,7 +643,7 @@ async def logout(
 
				                 expires_at = datetime.fromtimestamp(exp, tz=timezone.utc)
			
 
				                 try:
			
 
				                     await revoke_jti(jti, expires_at, username)
			
 
				-                except Exception as exc:
			
 
				+                except Exception as exc:  # SEC-AUTH-EXC: JTI-revoke failure on logout is logged only; logout removes access, never grants it (token stays valid until natural expiry — degraded but never escalation)
			
 
				                     _logger.error("Failed to revoke JTI on logout for user %s: %s", username, exc)
			
 
				         except PyJWTError:
			
 
				             client_ip = _get_client_ip(raw_request)
			
@@ -664,7 +688,7 @@ async def test_smtp_connection(
 
				 
			
 
				         logger.info(f"Test email sent successfully to {test_request.test_recipient}")
			
 
				         return TestSMTPResponse(success=True, message="Test email sent successfully")
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: SMTP test diagnostic returns success=False; no auth-relevant outcome (route is admin-gated by SETTINGS_UPDATE upstream)
			
 
				         logger.error("Failed to send test email: %s", e)
			
 
				         return TestSMTPResponse(success=False, message="Failed to send test email")
			
 
				 
			
@@ -698,7 +722,7 @@ async def save_smtp_config(
 
				         await db.commit()
			
 
				         logger.info(f"SMTP settings updated by admin user: {current_user.username if current_user else 'anonymous'}")
			
 
				         return {"message": "SMTP settings saved successfully"}
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); SMTP settings unchanged on error
			
 
				         await db.rollback()
			
 
				         logger.error("Failed to save SMTP settings: %s", e)
			
 
				         raise HTTPException(
			
@@ -743,7 +767,7 @@ async def enable_advanced_auth(
 
				         await db.commit()
			
 
				         logger.info(f"Advanced authentication enabled by admin user: {user.username}")
			
 
				         return {"message": "Advanced authentication enabled successfully", "advanced_auth_enabled": True}
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); advanced-auth setting unchanged on error
			
 
				         await db.rollback()
			
 
				         logger.error("Failed to enable advanced authentication: %s", e)
			
 
				         raise HTTPException(
			
@@ -777,7 +801,7 @@ async def disable_advanced_auth(
 
				         await db.commit()
			
 
				         logger.info(f"Advanced authentication disabled by admin user: {user.username}")
			
 
				         return {"message": "Advanced authentication disabled successfully", "advanced_auth_enabled": False}
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); advanced-auth setting unchanged on error
			
 
				         await db.rollback()
			
 
				         logger.error("Failed to disable advanced authentication: %s", e)
			
 
				         raise HTTPException(
			
@@ -826,7 +850,7 @@ async def _send_reset_email_or_delete_token(
 
				     try:
			
 
				         send_email(smtp_settings, to_email, subject, text_body, html_body)
			
 
				         _logger.info("Password reset email sent (%s) to %s", log_label, to_email)
			
 
				-    except Exception as exc:
			
 
				+    except Exception as exc:  # SEC-AUTH-EXC: email-send failure → defensive token cleanup so a stuck token doesn't block re-request; no access granted, just frees future workflow
			
 
				         _logger.error(
			
 
				             "Password reset email failed (%s) to %s — deleting token to unblock re-request: %s",
			
 
				             log_label,
			
@@ -842,7 +866,7 @@ async def _send_reset_email_or_delete_token(
 
				                     )
			
 
				                 )
			
 
				                 await db.commit()
			
 
				-        except Exception as db_exc:
			
 
				+        except Exception as db_exc:  # SEC-AUTH-EXC: nested cleanup failure logged only; no access decision made in this branch (already handling a prior failure)
			
 
				             _logger.error("Failed to delete reset token after send failure: %s", db_exc)
			
 
				 
			
 
				 
			
@@ -967,7 +991,7 @@ async def forgot_password(
 
				                 "forgot_password",
			
 
				             )
			
 
				             _logger.info("Password reset email queued for %s", user.email)
			
 
				-        except Exception as e:
			
 
				+        except Exception as e:  # SEC-AUTH-EXC: forgot-password response is intentionally generic regardless of outcome (user-enumeration defence); email failure does not grant access
			
 
				             _logger.error("Failed to send password reset email: %s", e)
			
 
				             # Don't reveal error to caller for security
			
 
				 
			
@@ -1114,7 +1138,7 @@ async def reset_user_password(
 
				 
			
 
				         _logger.info("Admin password reset link queued for user '%s' by admin '%s'", user.username, admin_user.username)
			
 
				         return ResetPasswordResponse(message=f"Password reset link sent to {user.email}")
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: rollback + raise 500 (fail-closed); reset token state unchanged on error
			
 
				         await db.rollback()
			
 
				         _logger.error("Failed to send admin password reset for user '%s': %s", user.username, e)
			
 
				         raise HTTPException(
			
@@ -1354,7 +1378,7 @@ async def search_ldap_directory(
 
				 
			
 
				     try:
			
 
				         results = search_ldap_users(config, query, limit=25)
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: raise 503 (fail-closed); route gated upstream by USERS_CREATE permission so detail leak is admin-only
			
 
				         _logger.exception("LDAP directory search failed")
			
 
				         # Admin-only endpoint — surface the underlying reason so the operator
			
 
				         # can fix it (auth_middleware already restricted access to USERS_CREATE).
			
@@ -1430,7 +1454,7 @@ async def provision_ldap_user(
 
				     # "username doesn't exist in the directory" in the UI.
			
 
				     try:
			
 
				         ldap_user = lookup_ldap_user(config, username)
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: raise 503 (fail-closed); LDAP provision never succeeds on lookup failure
			
 
				         _logger.exception("LDAP lookup failed during provision")
			
 
				         raise HTTPException(
			
 
				             status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
			
--- a/backend/app/api/routes/library.py
+++ b/backend/app/api/routes/library.py
@@ -63,7 +63,8 @@ from backend.app.schemas.library import (
 
				 )
			
 
				 from backend.app.schemas.slicer import SliceRequest, SliceResponse
			
 
				 from backend.app.services.archive import ThreeMFParser
			
 
				-from backend.app.services.stl_thumbnail import generate_stl_thumbnail
			
 
				+from backend.app.services.stl_thumbnail import MIN_USABLE_STL_BYTES, generate_stl_thumbnail
			
 
				+from backend.app.utils.filename import InvalidFilenameError, validate_print_filename
			
 
				 from backend.app.utils.threemf_tools import (
			
 
				     extract_embedded_presets_from_3mf,
			
 
				     extract_nozzle_mapping_from_3mf,
			
@@ -90,6 +91,26 @@ def get_library_files_dir() -> Path:
 
				     return files_dir
			
 
				 
			
 
				 
			
 
				+def classify_file_type(filename: str) -> str:
			
 
				+    """Return the canonical ``LibraryFile.file_type`` for *filename*.
			
 
				+
			
 
				+    Compound extensions are preserved — a `.gcode.3mf` file (a sliced
			
 
				+    output, still a 3MF zip on disk) is classified ``gcode.3mf`` rather
			
 
				+    than ``3mf``. Pre-#1600 this was only done in the external-scan
			
 
				+    path; the upload / ZIP-extract / in-process paths all stripped to
			
 
				+    the trailing extension and stored ``3mf``, so the FE had to accept
			
 
				+    both. Unified here so every ingest path stores the same value and
			
 
				+    downstream gates (gcode download, file-type filter, thumbnail
			
 
				+    extraction) only need to handle one canonical name per file family.
			
 
				+    Files with no extension classify as ``unknown``.
			
 
				+    """
			
 
				+    lower = filename.lower()
			
 
				+    if lower.endswith(".gcode.3mf"):
			
 
				+        return "gcode.3mf"
			
 
				+    ext = os.path.splitext(lower)[1]
			
 
				+    return ext[1:] if ext else "unknown"
			
 
				+
			
 
				+
			
 
				 def get_library_thumbnails_dir() -> Path:
			
 
				     """Get the directory for library thumbnails."""
			
 
				     thumbnails_dir = get_library_dir() / "thumbnails"
			
@@ -218,7 +239,7 @@ def _resolve_upload_destination(target_folder: LibraryFolder | None, filename: s
 
				             )
			
 
				         # Guard against path-traversal via a pathological filename — join then
			
 
				         # verify the resolved destination is still inside the external dir.
			
 
				-        dest = (ext_dir / filename).resolve()
			
 
				+        dest = (ext_dir / filename).resolve()  # SEC-PATH-OK: resolve + relative_to containment check on next line
			
 
				         try:
			
 
				             dest.relative_to(ext_dir.resolve())
			
 
				         except ValueError:
			
@@ -301,7 +322,7 @@ def _move_file_bytes(file: LibraryFile, target_folder: LibraryFolder | None) ->
 
				             raise _MoveSkip("target_inaccessible", f"target path not accessible: {ext_dir}")
			
 
				         if not os.access(ext_dir, os.W_OK):
			
 
				             raise _MoveSkip("target_unwritable", f"target path not writable: {ext_dir}")
			
 
				-        dest = (ext_dir / file.filename).resolve()
			
 
				+        dest = (ext_dir / file.filename).resolve()  # SEC-PATH-OK: resolve + relative_to containment check on next line
			
 
				         try:
			
 
				             dest.relative_to(ext_dir.resolve())
			
 
				         except ValueError:
			
@@ -432,7 +453,9 @@ async def save_3mf_bytes_to_library(
 
				     # extension so downstream logic (ThreeMFParser, thumbnail viewer) works.
			
 
				     ext = os.path.splitext(filename)[1].lower() or ".3mf"
			
 
				     unique_filename = f"{uuid.uuid4().hex}{ext}"
			
 
				-    file_path = get_library_files_dir() / unique_filename
			
 
				+    file_path = (
			
 
				+        get_library_files_dir() / unique_filename
			
 
				+    )  # SEC-PATH-OK: unique_filename = uuid.uuid4().hex + ext, generated on the previous line
			
 
				     with open(file_path, "wb") as fh:
			
 
				         fh.write(file_bytes)
			
 
				 
			
@@ -450,7 +473,7 @@ async def save_3mf_bytes_to_library(
 
				             if thumb_data:
			
 
				                 thumbs_dir = get_library_thumbnails_dir()
			
 
				                 thumb_filename = f"{uuid.uuid4().hex}{thumb_ext}"
			
 
				-                thumb_path = thumbs_dir / thumb_filename
			
 
				+                thumb_path = thumbs_dir / thumb_filename  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + thumb_ext
			
 
				                 with open(thumb_path, "wb") as fh:
			
 
				                     fh.write(thumb_data)
			
 
				                 thumbnail_path = str(thumb_path)
			
@@ -465,7 +488,7 @@ async def save_3mf_bytes_to_library(
 
				         folder_id=folder_id,
			
 
				         filename=filename,
			
 
				         file_path=to_relative_path(file_path),
			
 
				-        file_type=ext[1:] if ext else "unknown",
			
 
				+        file_type=classify_file_type(filename),
			
 
				         file_size=len(file_bytes),
			
 
				         file_hash=file_hash,
			
 
				         thumbnail_path=to_relative_path(thumbnail_path) if thumbnail_path else None,
			
@@ -553,7 +576,7 @@ def create_image_thumbnail(file_path: Path, thumbnails_dir: Path, max_size: int
 
				         from PIL import Image
			
 
				 
			
 
				         thumb_filename = f"{uuid.uuid4().hex}.png"
			
 
				-        thumb_path = thumbnails_dir / thumb_filename
			
 
				+        thumb_path = thumbnails_dir / thumb_filename  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + ".png"
			
 
				 
			
 
				         with Image.open(file_path) as img:
			
 
				             # Convert to RGB if necessary (for PNG with transparency, etc.)
			
@@ -581,7 +604,9 @@ def create_image_thumbnail(file_path: Path, thumbnails_dir: Path, max_size: int
 
				             file_size = file_path.stat().st_size
			
 
				             if file_size < 500000:  # Less than 500KB
			
 
				                 thumb_filename = f"{uuid.uuid4().hex}{file_path.suffix}"
			
 
				-                thumb_path = thumbnails_dir / thumb_filename
			
 
				+                thumb_path = (
			
 
				+                    thumbnails_dir / thumb_filename
			
 
				+                )  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + file_path.suffix
			
 
				                 shutil.copy2(file_path, thumb_path)
			
 
				                 return str(thumb_path)
			
 
				         except OSError:
			
@@ -635,6 +660,14 @@ async def _backfill_external_stl_thumbnails(folder_ids: list[int]) -> None:
 
				             abs_path = to_absolute_path(stl_file.file_path)
			
 
				             if not abs_path or not abs_path.exists():
			
 
				                 continue
			
 
				+            # Pre-skip files too small to contain even a single triangle.
			
 
				+            # Bulk-uploaded ZIPs of stub STLs would otherwise trigger one
			
 
				+            # trimesh.load() call + one debug log line per stub.
			
 
				+            try:
			
 
				+                if abs_path.stat().st_size < MIN_USABLE_STL_BYTES:
			
 
				+                    continue
			
 
				+            except OSError:
			
 
				+                continue
			
 
				             try:
			
 
				                 thumb_path = generate_stl_thumbnail(abs_path, thumbnails_dir)
			
 
				             except Exception as exc:  # noqa: BLE001 — never let one bad STL kill the rest
			
@@ -1073,20 +1106,73 @@ async def delete_folder(
 
				 
			
 
				 # ============ External Folder Endpoints ============
			
 
				 
			
 
				-# Blocked system directories that cannot be mounted
			
 
				-_BLOCKED_PREFIXES = (
			
 
				-    "/proc",
			
 
				-    "/sys",
			
 
				-    "/dev",
			
 
				-    "/run",
			
 
				-    "/boot",
			
 
				-    "/sbin",
			
 
				-    "/bin",
			
 
				-    "/usr/sbin",
			
 
				-    "/usr/bin",
			
 
				-    "/lib",
			
 
				-    "/etc",
			
 
				-)
			
 
				+# GHSA-r2qv follow-up (audit finding I1): external-folder mount path uses an
			
 
				+# allowlist of operator-opted-in roots rather than the original denylist of
			
 
				+# system directories. The denylist shape was fail-open-on-growth — anything
			
 
				+# not enumerated (``/data`` containing other users' archives, ``/root``,
			
 
				+# arbitrary NFS/SMB mounts, the Bambuddy ``LOG_DIR``) could be mounted by any
			
 
				+# user with ``LIBRARY_UPLOAD``. The allowlist defaults to empty and is
			
 
				+# extended via the ``BAMBUDDY_EXTERNAL_ROOTS`` env var (colon-separated
			
 
				+# absolute paths). The route is additionally gated on ``SETTINGS_UPDATE``
			
 
				+# (admin scope) rather than ``LIBRARY_UPLOAD`` because mounting host paths
			
 
				+# is an operator-level capability that crosses user boundaries.
			
 
				+
			
 
				+
			
 
				+# Bambuddy-owned data directories. Hardcode-rejected even if the operator
			
 
				+# tries to add them to ``BAMBUDDY_EXTERNAL_ROOTS`` — mounting these would
			
 
				+# allow reading other users' archives, log files, or the static assets path.
			
 
				+def _bambuddy_reserved_roots() -> tuple[Path, ...]:
			
 
				+    """Resolved Bambuddy-owned directories that may NEVER be mounted as an
			
 
				+    external folder regardless of the operator's allowlist.
			
 
				+
			
 
				+    Resolved at call time because tests patch ``settings.base_dir`` /
			
 
				+    ``settings.log_dir`` to a temp dir; resolving lazily picks up the
			
 
				+    patched values rather than module-import-time values.
			
 
				+    """
			
 
				+    from backend.app.core.config import settings as app_settings
			
 
				+
			
 
				+    reserved = [app_settings.base_dir, app_settings.log_dir, app_settings.static_dir, app_settings.archive_dir]
			
 
				+    return tuple(Path(p).resolve() for p in reserved if p is not None)
			
 
				+
			
 
				+
			
 
				+def _allowed_external_roots() -> tuple[Path, ...]:
			
 
				+    """Parse ``BAMBUDDY_EXTERNAL_ROOTS`` into resolved allowed roots.
			
 
				+
			
 
				+    Empty env var (the default) means external folders are disabled.
			
 
				+    Operators opt in explicitly: ``BAMBUDDY_EXTERNAL_ROOTS=/mnt/library:/srv/3d``
			
 
				+    Returns a tuple of resolved ``Path`` objects; entries that don't
			
 
				+    resolve to absolute paths are silently dropped (operator error, not
			
 
				+    a security boundary). Resolved lazily so tests can monkeypatch.
			
 
				+    """
			
 
				+    raw = os.environ.get("BAMBUDDY_EXTERNAL_ROOTS", "")
			
 
				+    roots: list[Path] = []
			
 
				+    for entry in raw.split(":"):
			
 
				+        entry = entry.strip()
			
 
				+        if not entry:
			
 
				+            continue
			
 
				+        try:
			
 
				+            resolved = Path(entry).resolve()
			
 
				+        except (OSError, RuntimeError):  # noqa: BLE001 — operator config error, not a security boundary
			
 
				+            continue
			
 
				+        if resolved.is_absolute():
			
 
				+            roots.append(resolved)
			
 
				+    return tuple(roots)
			
 
				+
			
 
				+
			
 
				+def _path_within(child: Path, parent: Path) -> bool:
			
 
				+    """Return True if ``child`` is ``parent`` or any descendant.
			
 
				+
			
 
				+    Uses ``Path.relative_to`` semantics (raises ``ValueError`` on miss)
			
 
				+    instead of string ``startswith``, which would falsely match
			
 
				+    ``/data-other`` against ``/data``. ``Path.is_relative_to`` is the
			
 
				+    sanctioned form on Python 3.9+; both are available here.
			
 
				+    """
			
 
				+    try:
			
 
				+        child.relative_to(parent)
			
 
				+    except ValueError:
			
 
				+        return False
			
 
				+    return True
			
 
				+
			
 
				 
			
 
				 # Supported file extensions for external folder scanning
			
 
				 _SCANNABLE_EXTENSIONS = {
			
@@ -1107,15 +1193,53 @@ _SCANNABLE_EXTENSIONS = {
 
				 
			
 
				 
			
 
				 def _validate_external_path(path_str: str) -> Path:
			
 
				-    """Validate an external path is safe to mount."""
			
 
				+    """Validate an external path is safe to mount.
			
 
				+
			
 
				+    Allowlist semantics:
			
 
				+    1. Path must be absolute and resolve cleanly (symlink-escape rejected
			
 
				+       implicitly by the resolved-startswith check below).
			
 
				+    2. Path must fall under one of the roots enumerated in
			
 
				+       ``BAMBUDDY_EXTERNAL_ROOTS``; empty allowlist (the default)
			
 
				+       means external folders are not available on this deployment.
			
 
				+    3. Path must NOT fall under any Bambuddy-owned directory (``base_dir``,
			
 
				+       ``log_dir``, ``static_dir``, ``archive_dir``) — the reserved set
			
 
				+       takes precedence over the allowlist, so an operator who accidentally
			
 
				+       sets ``BAMBUDDY_EXTERNAL_ROOTS=/`` does not expose ``/data``.
			
 
				+    4. Existence + directory-type + readability gates remain.
			
 
				+    """
			
 
				     path = Path(path_str).resolve()
			
 
				 
			
 
				     if not path.is_absolute():
			
 
				         raise HTTPException(status_code=400, detail="Path must be absolute")
			
 
				 
			
 
				-    for prefix in _BLOCKED_PREFIXES:
			
 
				-        if str(path).startswith(prefix):
			
 
				-            raise HTTPException(status_code=400, detail=f"Cannot mount system directory: {prefix}")
			
 
				+    allowed_roots = _allowed_external_roots()
			
 
				+    if not allowed_roots:
			
 
				+        raise HTTPException(
			
 
				+            status_code=400,
			
 
				+            detail=(
			
 
				+                "External folders are not enabled on this deployment. Ask the "
			
 
				+                "operator to set BAMBUDDY_EXTERNAL_ROOTS=<colon-separated paths>."
			
 
				+            ),
			
 
				+        )
			
 
				+
			
 
				+    # Reserved (Bambuddy-owned) paths are rejected before the allowlist check
			
 
				+    # so an over-broad allowlist (e.g. operator set "/" for testing) cannot
			
 
				+    # expose Bambuddy's own data dir or log dir.
			
 
				+    for reserved in _bambuddy_reserved_roots():
			
 
				+        if _path_within(path, reserved):
			
 
				+            raise HTTPException(
			
 
				+                status_code=400,
			
 
				+                detail=f"Cannot mount Bambuddy-managed directory: {reserved}",
			
 
				+            )
			
 
				+
			
 
				+    if not any(_path_within(path, root) for root in allowed_roots):
			
 
				+        raise HTTPException(
			
 
				+            status_code=400,
			
 
				+            detail=(
			
 
				+                f"Path '{path}' is not within an allowed external root. "
			
 
				+                f"Allowed roots: {', '.join(str(r) for r in allowed_roots)}"
			
 
				+            ),
			
 
				+        )
			
 
				 
			
 
				     if not path.exists():
			
 
				         raise HTTPException(status_code=400, detail=f"Path does not exist: {path}")
			
@@ -1134,7 +1258,14 @@ def _validate_external_path(path_str: str) -> Path:
 
				 async def create_external_folder(
			
 
				     data: ExternalFolderCreate,
			
 
				     db: AsyncSession = Depends(get_db),
			
 
				-    _: User | None = Depends(require_permission_if_auth_enabled(Permission.LIBRARY_UPLOAD)),
			
 
				+    # GHSA-r2qv follow-up (I1): elevated from LIBRARY_UPLOAD to SETTINGS_UPDATE.
			
 
				+    # Registering a host filesystem path as a Bambuddy library folder is an
			
 
				+    # operator-level capability that crosses user boundaries (one user's
			
 
				+    # registered external folder is visible to every other user via
			
 
				+    # /api/v1/library/folders). LIBRARY_UPLOAD was always the wrong scope —
			
 
				+    # SETTINGS_UPDATE is the admin-class gate that already protects every
			
 
				+    # other host-affecting setting (SMTP, LDAP, cloud, smart plugs).
			
 
				+    _: User | None = Depends(require_permission_if_auth_enabled(Permission.SETTINGS_UPDATE)),
			
 
				 ):
			
 
				     """Create an external folder that points to a host directory."""
			
 
				     resolved = _validate_external_path(data.external_path)
			
@@ -1294,7 +1425,9 @@ async def scan_external_folder(
 
				                             name=part,
			
 
				                             parent_id=current_parent,
			
 
				                             is_external=True,
			
 
				-                            external_path=str(ext_path / current_path),
			
 
				+                            external_path=str(
			
 
				+                                ext_path / current_path
			
 
				+                            ),  # SEC-PATH-OK: current_path built from Path(rel_dir).parts of an os.walk descent under ext_path
			
 
				                             external_readonly=folder.external_readonly,
			
 
				                             external_show_hidden=folder.external_show_hidden,
			
 
				                         )
			
@@ -1310,7 +1443,9 @@ async def scan_external_folder(
 
				             if not folder.external_show_hidden and filename.startswith("."):
			
 
				                 continue
			
 
				 
			
 
				-            filepath = Path(dirpath) / filename
			
 
				+            filepath = (
			
 
				+                Path(dirpath) / filename
			
 
				+            )  # SEC-PATH-OK: dirpath + filename from os.walk(ext_path); filesystem-discovered, not user input
			
 
				             ext = filepath.suffix.lower()
			
 
				 
			
 
				             # Check for compound extensions like .gcode.3mf
			
@@ -1339,17 +1474,16 @@ async def scan_external_folder(
 
				             except OSError:
			
 
				                 continue
			
 
				 
			
 
				-            file_type = ext[1:] if ext else "unknown"
			
 
				-            # For compound extensions, use the meaningful part
			
 
				-            if file_type in ("3mf",) and len(filepath.suffixes) >= 2:
			
 
				-                inner = filepath.suffixes[-2].lower()
			
 
				-                if inner == ".gcode":
			
 
				-                    file_type = "gcode.3mf"
			
 
				+            file_type = classify_file_type(filename)
			
 
				 
			
 
				-            # Extract thumbnail for 3mf files
			
 
				+            # Extract thumbnail for 3mf files (including .gcode.3mf sliced
			
 
				+            # outputs — those are 3MF zips on disk and carry the same
			
 
				+            # thumbnail Metadata/plate_1.png the parser reads). Pre-#1600
			
 
				+            # the gate was `file_type == "3mf"` alone, so .gcode.3mf files
			
 
				+            # in external folders silently got no thumbnail.
			
 
				             thumbnail_path = None
			
 
				             file_metadata = None
			
 
				-            if file_type == "3mf":
			
 
				+            if file_type in ("3mf", "gcode.3mf"):
			
 
				                 try:
			
 
				                     parser = ThreeMFParser(str(filepath))
			
 
				                     raw_metadata = parser.parse()
			
@@ -1360,7 +1494,9 @@ async def scan_external_folder(
 
				                         if thumb_data:
			
 
				                             thumb_dir = get_library_thumbnails_dir()
			
 
				                             thumb_filename = f"{uuid.uuid4().hex}{thumbnail_ext}"
			
 
				-                            thumb_full = thumb_dir / thumb_filename
			
 
				+                            thumb_full = (
			
 
				+                                thumb_dir / thumb_filename
			
 
				+                            )  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + thumbnail_ext
			
 
				                             thumb_full.write_bytes(thumb_data)
			
 
				                             thumbnail_path = to_relative_path(thumb_full)
			
 
				 
			
@@ -1393,7 +1529,7 @@ async def scan_external_folder(
 
				                 if thumb_data:
			
 
				                     thumb_dir = get_library_thumbnails_dir()
			
 
				                     thumb_filename = f"{uuid.uuid4().hex}.png"
			
 
				-                    thumb_full = thumb_dir / thumb_filename
			
 
				+                    thumb_full = thumb_dir / thumb_filename  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + ".png"
			
 
				                     thumb_full.write_bytes(thumb_data)
			
 
				                     thumbnail_path = to_relative_path(thumb_full)
			
 
				 
			
@@ -1577,9 +1713,17 @@ async def upload_file(
 
				             raise HTTPException(status_code=400, detail="Filename is required")
			
 
				 
			
 
				         filename = file.filename
			
 
				+        # Reject FAT32/exFAT-incompatible filenames up front (#1540).
			
 
				+        try:
			
 
				+            validate_print_filename(filename)
			
 
				+        except InvalidFilenameError as e:
			
 
				+            raise HTTPException(status_code=400, detail=str(e)) from e
			
 
				         ext = os.path.splitext(filename)[1].lower()
			
 
				-        # Handle files without extension
			
 
				-        file_type = ext[1:] if ext else "unknown"
			
 
				+        # `file_type` is compound-aware (`gcode.3mf` for sliced outputs).
			
 
				+        # `ext` stays the trailing extension because the on-disk filename
			
 
				+        # uses it directly and the 3MF-parse branch below still gates on
			
 
				+        # `ext == ".3mf"`, which is correct for both `.3mf` and `.gcode.3mf`.
			
 
				+        file_type = classify_file_type(filename)
			
 
				 
			
 
				         # Verify folder exists if specified
			
 
				         target_folder = None
			
@@ -1633,7 +1777,9 @@ async def upload_file(
 
				                 # Save thumbnail if extracted
			
 
				                 if thumbnail_data:
			
 
				                     thumb_filename = f"{uuid.uuid4().hex}{thumbnail_ext}"
			
 
				-                    thumb_path = thumbnails_dir / thumb_filename
			
 
				+                    thumb_path = (
			
 
				+                        thumbnails_dir / thumb_filename
			
 
				+                    )  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + thumbnail_ext
			
 
				                     with open(thumb_path, "wb") as f:
			
 
				                         f.write(thumbnail_data)
			
 
				                     thumbnail_path = str(thumb_path)
			
@@ -1662,7 +1808,9 @@ async def upload_file(
 
				                 thumbnail_data = extract_gcode_thumbnail(file_path)
			
 
				                 if thumbnail_data:
			
 
				                     thumb_filename = f"{uuid.uuid4().hex}.png"
			
 
				-                    thumb_path = thumbnails_dir / thumb_filename
			
 
				+                    thumb_path = (
			
 
				+                        thumbnails_dir / thumb_filename
			
 
				+                    )  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + ".png"
			
 
				                     with open(thumb_path, "wb") as f:
			
 
				                         f.write(thumbnail_data)
			
 
				                     thumbnail_path = str(thumb_path)
			
@@ -1674,9 +1822,16 @@ async def upload_file(
 
				             thumbnail_path = create_image_thumbnail(file_path, thumbnails_dir)
			
 
				 
			
 
				         elif ext == ".stl":
			
 
				-            # Generate STL thumbnail if enabled
			
 
				+            # Generate STL thumbnail if enabled. Same MIN_USABLE_STL_BYTES
			
 
				+            # pre-skip as extract_zip_file — stubs / placeholders below this
			
 
				+            # size can't contain a triangle so trimesh would return an empty
			
 
				+            # mesh anyway.
			
 
				             if generate_stl_thumbnails:
			
 
				-                thumbnail_path = generate_stl_thumbnail(file_path, thumbnails_dir)
			
 
				+                try:
			
 
				+                    if file_path.stat().st_size >= MIN_USABLE_STL_BYTES:
			
 
				+                        thumbnail_path = generate_stl_thumbnail(file_path, thumbnails_dir)
			
 
				+                except OSError:
			
 
				+                    pass
			
 
				 
			
 
				         # Create database entry (managed files store relative paths for portability;
			
 
				         # external files store the absolute mount path — same shape as scan produces)
			
@@ -1862,11 +2017,13 @@ async def extract_zip_file(
 
				                     # Extract file
			
 
				                     filename = os.path.basename(zip_path)
			
 
				                     ext = os.path.splitext(filename)[1].lower()
			
 
				-                    file_type = ext[1:] if ext else "unknown"
			
 
				+                    file_type = classify_file_type(filename)
			
 
				 
			
 
				                     # Generate unique filename for storage
			
 
				                     unique_filename = f"{uuid.uuid4().hex}{ext}"
			
 
				-                    file_path = get_library_files_dir() / unique_filename
			
 
				+                    file_path = (
			
 
				+                        get_library_files_dir() / unique_filename
			
 
				+                    )  # SEC-PATH-OK: unique_filename = uuid.uuid4().hex + ext
			
 
				 
			
 
				                     # Extract and save file
			
 
				                     file_content = zf.read(zip_path)
			
@@ -1891,7 +2048,9 @@ async def extract_zip_file(
 
				 
			
 
				                             if thumbnail_data:
			
 
				                                 thumb_filename = f"{uuid.uuid4().hex}{thumbnail_ext}"
			
 
				-                                thumb_path = thumbnails_dir / thumb_filename
			
 
				+                                thumb_path = (
			
 
				+                                    thumbnails_dir / thumb_filename
			
 
				+                                )  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + thumbnail_ext
			
 
				                                 with open(thumb_path, "wb") as f:
			
 
				                                     f.write(thumbnail_data)
			
 
				                                 thumbnail_path = str(thumb_path)
			
@@ -1918,7 +2077,9 @@ async def extract_zip_file(
 
				                             thumbnail_data = extract_gcode_thumbnail(file_path)
			
 
				                             if thumbnail_data:
			
 
				                                 thumb_filename = f"{uuid.uuid4().hex}.png"
			
 
				-                                thumb_path = thumbnails_dir / thumb_filename
			
 
				+                                thumb_path = (
			
 
				+                                    thumbnails_dir / thumb_filename
			
 
				+                                )  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + ".png"
			
 
				                                 with open(thumb_path, "wb") as f:
			
 
				                                     f.write(thumbnail_data)
			
 
				                                 thumbnail_path = str(thumb_path)
			
@@ -1929,8 +2090,12 @@ async def extract_zip_file(
 
				                         thumbnail_path = create_image_thumbnail(file_path, thumbnails_dir)
			
 
				 
			
 
				                     elif ext == ".stl":
			
 
				-                        # Generate STL thumbnail if enabled
			
 
				-                        if generate_stl_thumbnails:
			
 
				+                        # Generate STL thumbnail if enabled. Pre-skip files
			
 
				+                        # below MIN_USABLE_STL_BYTES — they can't contain
			
 
				+                        # even a single triangle, and bulk-uploaded ZIPs of
			
 
				+                        # stub STLs would otherwise log one debug line per
			
 
				+                        # file via the empty-mesh branch in trimesh.load.
			
 
				+                        if generate_stl_thumbnails and len(file_content) >= MIN_USABLE_STL_BYTES:
			
 
				                             thumbnail_path = generate_stl_thumbnail(file_path, thumbnails_dir)
			
 
				 
			
 
				                     # Create database entry (store relative paths for portability)
			
@@ -3436,7 +3601,7 @@ async def slice_and_persist(
 
				     base_name = model_filename.rsplit(".", 1)[0]
			
 
				     out_filename = f"{base_name}.gcode.3mf"
			
 
				     unique_name = f"{uuid.uuid4().hex}.gcode.3mf"
			
 
				-    out_path = get_library_files_dir() / unique_name
			
 
				+    out_path = get_library_files_dir() / unique_name  # SEC-PATH-OK: unique_name = uuid.uuid4().hex + ".gcode.3mf"
			
 
				     out_path.write_bytes(result.content)
			
 
				 
			
 
				     # Extract thumbnail from the produced 3MF so the library card shows a
			
@@ -3553,9 +3718,13 @@ async def slice_and_persist_as_archive(
 
				     timestamp = datetime.now(timezone.utc).strftime("%Y%m%d_%H%M%S")
			
 
				     printer_folder = str(source_archive.printer_id) if source_archive.printer_id is not None else "unassigned"
			
 
				     archive_subdir = f"{timestamp}_{base_name}_sliced"
			
 
				-    archive_dir = app_settings.archive_dir / printer_folder / archive_subdir
			
 
				+    archive_dir = (
			
 
				+        app_settings.archive_dir / printer_folder / archive_subdir
			
 
				+    )  # SEC-PATH-OK: printer_folder = str(int|None), archive_subdir = f"{timestamp}_{base_name}_sliced" where base_name went through _safe_filename
			
 
				     archive_dir.mkdir(parents=True, exist_ok=True)
			
 
				-    out_path = archive_dir / out_filename
			
 
				+    out_path = (
			
 
				+        archive_dir / out_filename
			
 
				+    )  # SEC-PATH-OK: out_filename = f"{base_name}.gcode.3mf" where base_name went through _safe_filename
			
 
				     out_path.write_bytes(result.content)
			
 
				 
			
 
				     # Extract a thumbnail for the new archive card. Priority order:
			
@@ -3830,6 +3999,15 @@ async def print_library_file(
 
				             detail="Not a sliced file. Only .gcode or .gcode.3mf files can be printed.",
			
 
				         )
			
 
				 
			
 
				+    # Filenames containing FAT32/exFAT-illegal characters would 553 at
			
 
				+    # FTP upload time (#1540). Older rows may pre-date the rename-time
			
 
				+    # validation, so reject the print attempt with an actionable message
			
 
				+    # rather than silently renaming user data.
			
 
				+    try:
			
 
				+        validate_print_filename(lib_file.filename)
			
 
				+    except InvalidFilenameError as e:
			
 
				+        raise HTTPException(status_code=400, detail=str(e)) from e
			
 
				+
			
 
				     # Get the full file path
			
 
				     file_path = Path(app_settings.base_dir) / lib_file.file_path
			
 
				 
			
@@ -4007,9 +4185,13 @@ async def update_file(
 
				             raise HTTPException(status_code=403, detail="You can only update your own files")
			
 
				 
			
 
				     if data.filename is not None:
			
 
				-        # Validate filename doesn't contain path separators
			
 
				-        if "/" in data.filename or "\\" in data.filename:
			
 
				-            raise HTTPException(status_code=400, detail="Filename cannot contain path separators")
			
 
				+        # Bambu printer SD cards are FAT32/exFAT; reject the same set Bambu
			
 
				+        # Studio refuses on save so we fail here with a clear message
			
 
				+        # instead of an obscure FTP 553 at print time (#1540).
			
 
				+        try:
			
 
				+            validate_print_filename(data.filename)
			
 
				+        except InvalidFilenameError as e:
			
 
				+            raise HTTPException(status_code=400, detail=str(e)) from e
			
 
				         file.filename = data.filename
			
 
				         # No print_name to keep in sync — library files display by filename,
			
 
				         # and _without_print_name strips the embedded 3MF Title on import (#1489).
			
@@ -4227,8 +4409,10 @@ async def get_gcode(
 
				 
			
 
				     if file.file_type == "gcode":
			
 
				         return FastAPIFileResponse(str(abs_path), media_type="text/plain")
			
 
				-    elif file.file_type == "3mf":
			
 
				-        # Extract gcode from 3mf
			
 
				+    elif file.file_type in ("3mf", "gcode.3mf"):
			
 
				+        # Extract gcode from 3mf zip container. `.gcode.3mf` sliced outputs
			
 
				+        # carry the same `Metadata/plate_*.gcode` entries as a `.3mf`, so
			
 
				+        # the unzip path is identical — just had to expand the gate.
			
 
				         try:
			
 
				             with zipfile.ZipFile(str(abs_path), "r") as zf:
			
 
				                 # Find gcode file
			
--- a/backend/app/api/routes/maintenance.py
+++ b/backend/app/api/routes/maintenance.py
@@ -126,7 +126,8 @@ async def get_printer_total_hours(db: AsyncSession, printer_id: int) -> float:
 
				     """Calculate total active hours for a printer from runtime counter plus offset.
			
 
				 
			
 
				     Uses the runtime_seconds counter which tracks actual machine active time
			
 
				-    (RUNNING and PAUSE states), including calibration, heating, and printing.
			
 
				+    (RUNNING state only — paused time is excluded since maintenance intervals
			
 
				+    measure mechanical wear, not wall-clock active time, see #1521).
			
 
				     """
			
 
				     # Get printer runtime and offset
			
 
				     result = await db.execute(
			
@@ -208,6 +209,7 @@ async def create_maintenance_type(
 
				         default_interval_hours=data.default_interval_hours,
			
 
				         interval_type=data.interval_type,
			
 
				         icon=data.icon,
			
 
				+        wiki_url=data.wiki_url,
			
 
				         is_system=False,
			
 
				     )
			
 
				     db.add(new_type)
			
@@ -714,7 +716,7 @@ async def set_printer_hours(
 
				 
			
 
				     The offset is calculated as: offset = total_hours - runtime_hours
			
 
				     Where runtime_hours comes from the runtime_seconds counter that tracks
			
 
				-    actual machine active time (RUNNING/PAUSE states).
			
 
				+    actual machine active time (RUNNING state only — paused time excluded, #1521).
			
 
				     """
			
 
				     # Get printer
			
 
				     result = await db.execute(select(Printer).where(Printer.id == printer_id))
			
--- a/backend/app/api/routes/metrics.py
+++ b/backend/app/api/routes/metrics.py
@@ -1,6 +1,7 @@
 
				 """Prometheus metrics endpoint for external monitoring."""
			
 
				 
			
 
				 import platform
			
 
				+import secrets
			
 
				 
			
 
				 from fastapi import APIRouter, Depends, Header, HTTPException, Response
			
 
				 from sqlalchemy import func, select
			
@@ -75,7 +76,9 @@ async def get_metrics(
 
				         if not authorization.startswith("Bearer "):
			
 
				             raise HTTPException(status_code=401, detail="Bearer token required")
			
 
				         provided_token = authorization[7:]  # Remove "Bearer " prefix
			
 
				-        if provided_token != token:
			
 
				+        # Constant-time comparison closes the byte-by-byte timing oracle that
			
 
				+        # plain ``!=`` opens on a LAN-attached attacker (audit finding I2).
			
 
				+        if not secrets.compare_digest(provided_token.encode("utf-8"), token.encode("utf-8")):
			
 
				             raise HTTPException(status_code=401, detail="Invalid token")
			
 
				 
			
 
				     lines: list[str] = []
			
--- a/backend/app/api/routes/mfa.py
+++ b/backend/app/api/routes/mfa.py
@@ -562,6 +562,57 @@ def _resolve_provider_email(provider: OIDCProvider, claims: dict, provider_sub:
 
				     return raw_email
			
 
				 
			
 
				 
			
 
				+def _resolve_standard_email_for_user_record(provider: OIDCProvider, claims: dict, provider_sub: str) -> str | None:
			
 
				+    """Resolve the standard 'email' claim for populating a newly-created User.email.
			
 
				+
			
 
				+    Issue #1569: when an operator sets email_claim to a non-email identity claim
			
 
				+    (e.g. preferred_username on Authentik), the primary _resolve_provider_email
			
 
				+    returns None because the identity value isn't email-shaped. This helper lets
			
 
				+    the auto-create-users path still capture the user's real email from the
			
 
				+    standard 'email' claim that the IdP usually sends alongside.
			
 
				+
			
 
				+    This is NOT a substitute for _resolve_provider_email and does NOT feed
			
 
				+    auto_link_existing_accounts — that gate stays on the primary resolver, so
			
 
				+    the GHSA Fall-B/C security guards remain intact.
			
 
				+
			
 
				+    Applies the same Fall A/B shape + email_verified logic as the primary
			
 
				+    resolver does for the standard 'email' claim.
			
 
				+    """
			
 
				+    raw_claim_value = claims.get("email")
			
 
				+    if raw_claim_value is not None and not isinstance(raw_claim_value, str):
			
 
				+        logger.warning(
			
 
				+            "OIDC provider %d: standard 'email' claim has unexpected type %s for sub=%r, ignoring",
			
 
				+            provider.id,
			
 
				+            type(raw_claim_value).__name__,
			
 
				+            provider_sub,
			
 
				+        )
			
 
				+        return None
			
 
				+    raw_email = raw_claim_value.lower().strip() if raw_claim_value else None
			
 
				+    if not raw_email:
			
 
				+        return None
			
 
				+    if not _is_valid_email_shaped(raw_email):
			
 
				+        logger.warning(
			
 
				+            "OIDC provider %d: standard 'email' claim failed shape check for sub=%r, ignoring",
			
 
				+            provider.id,
			
 
				+            provider_sub,
			
 
				+        )
			
 
				+        return None
			
 
				+    email_verified = claims.get("email_verified")
			
 
				+    if provider.require_email_verified:
			
 
				+        if email_verified is True:
			
 
				+            return raw_email
			
 
				+        logger.info(
			
 
				+            "OIDC provider %d: ignoring fallback email for sub=%r because email_verified=%r",
			
 
				+            provider.id,
			
 
				+            provider_sub,
			
 
				+            email_verified,
			
 
				+        )
			
 
				+        return None
			
 
				+    if email_verified is False:
			
 
				+        return None
			
 
				+    return raw_email
			
 
				+
			
 
				+
			
 
				 # ---------------------------------------------------------------------------
			
 
				 # Settings helpers (email 2FA flag)
			
 
				 # ---------------------------------------------------------------------------
			
@@ -1905,6 +1956,18 @@ async def oidc_callback(
 
				                             raw = provider_sub[:30]
			
 
				                     candidate = re.sub(r"[^a-zA-Z0-9._-]", "", raw)[:30] or "oidcuser"
			
 
				 
			
 
				+                    # Issue #1569: when email_claim is configured to a non-email
			
 
				+                    # identity claim (e.g. preferred_username on Authentik), the
			
 
				+                    # primary resolver returns None for the email field because the
			
 
				+                    # identity value isn't email-shaped. Fall back to the standard
			
 
				+                    # 'email' claim for User.email so the operator can split
			
 
				+                    # username-from-preferred_username and email-from-email.
			
 
				+                    # The auto-link gate above stays on provider_email, so the
			
 
				+                    # GHSA Fall-B/C guards remain intact.
			
 
				+                    user_email_for_storage = provider_email
			
 
				+                    if user_email_for_storage is None and provider.email_claim != "email":
			
 
				+                        user_email_for_storage = _resolve_standard_email_for_user_record(provider, claims, provider_sub)
			
 
				+
			
 
				                     username = candidate
			
 
				                     counter = 1
			
 
				                     while True:
			
@@ -1932,7 +1995,7 @@ async def oidc_callback(
 
				 
			
 
				                     new_user = User(
			
 
				                         username=username,
			
 
				-                        email=provider_email,
			
 
				+                        email=user_email_for_storage,
			
 
				                         # M-1: auth_source="oidc" prevents local password-reset flow
			
 
				                         # for users who should only authenticate via OIDC.
			
 
				                         auth_source="oidc",
			
@@ -1949,7 +2012,7 @@ async def oidc_callback(
 
				                             user_id=new_user.id,
			
 
				                             provider_id=provider_id,
			
 
				                             provider_user_id=provider_sub,
			
 
				-                            provider_email=provider_email,
			
 
				+                            provider_email=user_email_for_storage,
			
 
				                         )
			
 
				                     )
			
 
				                     await db.commit()
			
--- a/backend/app/api/routes/print_queue.py
+++ b/backend/app/api/routes/print_queue.py
@@ -401,6 +401,15 @@ async def add_to_queue(
 
				         library_file = result.scalar_one_or_none()
			
 
				         if not library_file:
			
 
				             raise HTTPException(400, "Library file not found")
			
 
				+        # Bambu SD card is FAT32/exFAT — illegal filename chars would 553 at
			
 
				+        # FTP upload time (#1540). Reject at queue time so the user gets the
			
 
				+        # actionable error before waiting in queue.
			
 
				+        from backend.app.utils.filename import InvalidFilenameError, validate_print_filename
			
 
				+
			
 
				+        try:
			
 
				+            validate_print_filename(library_file.filename)
			
 
				+        except InvalidFilenameError as e:
			
 
				+            raise HTTPException(400, str(e)) from e
			
 
				 
			
 
				     # Extract filament types for model-based assignment (used by scheduler for validation)
			
 
				     required_filament_types = None
			
--- a/backend/app/api/routes/printers.py
+++ b/backend/app/api/routes/printers.py
@@ -182,14 +182,19 @@ async def get_available_filaments(
 
				                 tray_type = tray.get("tray_type")
			
 
				                 if not tray_type:
			
 
				                     continue
			
 
				-                tray_color = tray.get("tray_color", "")
			
 
				-                # Normalize color: remove alpha, add hash
			
 
				-                hex_color = tray_color.replace("#", "")[:6] if tray_color else "808080"
			
 
				-                color = f"#{hex_color}"
			
 
				+                tray_color = tray.get("tray_color", "") or "808080"
			
 
				+                # Preserve the full RRGGBBAA so transparent filament (alpha=00)
			
 
				+                # reaches the frontend instead of collapsing to #000000 → black
			
 
				+                # (#1545). Opaque colours still round-trip as #RRGGBB. The
			
 
				+                # dedup key uses the 6-char RGB so two slots that share an RGB
			
 
				+                # but differ only in alpha still merge.
			
 
				+                stripped = tray_color.replace("#", "")
			
 
				+                rgb = stripped[:6].lower() or "808080"
			
 
				+                color = f"#{stripped}"
			
 
				                 tray_info_idx = tray.get("tray_info_idx", "")
			
 
				                 tray_sub_brands = tray.get("tray_sub_brands", "") or ""
			
 
				 
			
 
				-                key = (tray_type.upper(), hex_color.lower(), tray_sub_brands.upper(), extruder_id)
			
 
				+                key = (tray_type.upper(), rgb, tray_sub_brands.upper(), extruder_id)
			
 
				                 if key not in seen:
			
 
				                     seen.add(key)
			
 
				                     filaments.append(
			
@@ -207,15 +212,17 @@ async def get_available_filaments(
 
				             vt_type = vt.get("tray_type")
			
 
				             if not vt_type:
			
 
				                 continue
			
 
				-            vt_color = vt.get("tray_color", "")
			
 
				-            hex_color = vt_color.replace("#", "")[:6] if vt_color else "808080"
			
 
				-            color = f"#{hex_color}"
			
 
				+            vt_color = vt.get("tray_color", "") or "808080"
			
 
				+            # Same alpha-preserving handling as the AMS branch — see #1545.
			
 
				+            stripped = vt_color.replace("#", "")
			
 
				+            rgb = stripped[:6].lower() or "808080"
			
 
				+            color = f"#{stripped}"
			
 
				             tray_info_idx = vt.get("tray_info_idx", "")
			
 
				             tray_sub_brands = vt.get("tray_sub_brands", "") or ""
			
 
				             vt_id = int(vt.get("id", 254))
			
 
				             extruder_id = (255 - vt_id) if ams_extruder_map else None
			
 
				 
			
 
				-            key = (vt_type.upper(), hex_color.lower(), tray_sub_brands.upper(), extruder_id)
			
 
				+            key = (vt_type.upper(), rgb, tray_sub_brands.upper(), extruder_id)
			
 
				             if key not in seen:
			
 
				                 seen.add(key)
			
 
				                 filaments.append(
			
--- a/backend/app/api/routes/projects.py
+++ b/backend/app/api/routes/projects.py
@@ -20,6 +20,7 @@ from backend.app.core.database import get_db
 
				 from backend.app.core.permissions import Permission
			
 
				 from backend.app.models.archive import PrintArchive
			
 
				 from backend.app.models.library import LibraryFile, LibraryFolder
			
 
				+from backend.app.models.print_log import PrintLogEntry
			
 
				 from backend.app.models.print_queue import PrintQueueItem
			
 
				 from backend.app.models.project import Project
			
 
				 from backend.app.models.project_bom import ProjectBOMItem
			
@@ -41,46 +42,73 @@ from backend.app.schemas.project import (
 
				     TimelineEvent,
			
 
				 )
			
 
				 from backend.app.utils.http import build_content_disposition
			
 
				+from backend.app.utils.safe_path import safe_join_under
			
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
 
				 
			
 
				 router = APIRouter(prefix="/projects", tags=["projects"])
			
 
				 
			
 
				 
			
 
				+_FAILURE_STATUSES = ("failed", "aborted", "cancelled", "stopped")
			
 
				+
			
 
				+
			
 
				 async def compute_project_stats(
			
 
				     db: AsyncSession, project_id: int, target_count: int | None = None, target_parts_count: int | None = None
			
 
				 ) -> ProjectStats:
			
 
				-    """Compute statistics for a project."""
			
 
				-    # Count total archives (distinct print jobs)
			
 
				-    total_result = await db.execute(select(func.count(PrintArchive.id)).where(PrintArchive.project_id == project_id))
			
 
				-    total_archives = total_result.scalar() or 0
			
 
				-
			
 
				-    # Sum total items (using quantity field)
			
 
				-    total_items_result = await db.execute(
			
 
				-        select(func.coalesce(func.sum(PrintArchive.quantity), 0)).where(PrintArchive.project_id == project_id)
			
 
				-    )
			
 
				-    total_items = total_items_result.scalar() or 0
			
 
				-
			
 
				-    # Count failed archives (number of print jobs) - includes all failure states
			
 
				-    failed_result = await db.execute(
			
 
				-        select(func.count(PrintArchive.id)).where(
			
 
				-            PrintArchive.project_id == project_id,
			
 
				-            PrintArchive.status.in_(["failed", "aborted", "cancelled", "stopped"]),
			
 
				+    """Compute statistics for a project.
			
 
				+
			
 
				+    Aggregates from ``print_log_entries`` joined to ``print_archives`` so
			
 
				+    every actual run contributes — pre-fix this counted ``print_archives``
			
 
				+    (one row per file), which under-reported every reprint by collapsing
			
 
				+    runs back into the source file (#1593). The Archive Print Log view
			
 
				+    already drives off the same source (``archives.py::list_archives_slim``),
			
 
				+    so project stats now stay aligned with the per-archive numbers.
			
 
				+
			
 
				+    Orphan log entries (``archive_id IS NULL`` after archive deletion via
			
 
				+    ``ON DELETE SET NULL``) are excluded by the inner join — they can't
			
 
				+    be attributed to a project.
			
 
				+    """
			
 
				+    # Per-run aggregates from print_log_entries joined on archive_id so
			
 
				+    # the WHERE filters by archives.project_id. Each run's duration,
			
 
				+    # filament, cost, and energy come from the log row, not the source
			
 
				+    # archive — so multi-plate 3MFs and reprints both count correctly.
			
 
				+    log_stats_result = await db.execute(
			
 
				+        select(
			
 
				+            func.count(PrintLogEntry.id).label("total_runs"),
			
 
				+            func.coalesce(func.sum(PrintLogEntry.duration_seconds), 0).label("total_time"),
			
 
				+            func.coalesce(func.sum(PrintLogEntry.filament_used_grams), 0).label("total_filament"),
			
 
				+            func.coalesce(func.sum(PrintLogEntry.cost), 0).label("total_filament_cost"),
			
 
				+            func.coalesce(func.sum(PrintLogEntry.energy_kwh), 0).label("total_energy"),
			
 
				+            func.coalesce(func.sum(PrintLogEntry.energy_cost), 0).label("total_energy_cost"),
			
 
				         )
			
 
				+        .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
			
 
				+        .where(PrintArchive.project_id == project_id)
			
 
				     )
			
 
				-    failed_prints = failed_result.scalar() or 0
			
 
				+    log_stats = log_stats_result.first()
			
 
				+    total_archives = int(log_stats.total_runs or 0)
			
 
				 
			
 
				-    # Sum print time, filament, and energy
			
 
				-    sums_result = await db.execute(
			
 
				+    # Total items the project has produced or attempted: sum of quantity
			
 
				+    # per run (each run contributes its archive's quantity). The total/
			
 
				+    # completed/failed splits are all per-run, not per-file.
			
 
				+    items_split_result = await db.execute(
			
 
				         select(
			
 
				-            func.coalesce(func.sum(PrintArchive.print_time_seconds), 0).label("total_time"),
			
 
				-            func.coalesce(func.sum(PrintArchive.filament_used_grams), 0).label("total_filament"),
			
 
				-            func.coalesce(func.sum(PrintArchive.cost), 0).label("total_filament_cost"),
			
 
				-            func.coalesce(func.sum(PrintArchive.energy_kwh), 0).label("total_energy"),
			
 
				-            func.coalesce(func.sum(PrintArchive.energy_cost), 0).label("total_energy_cost"),
			
 
				-        ).where(PrintArchive.project_id == project_id)
			
 
				+            func.coalesce(func.sum(PrintArchive.quantity), 0).label("total_items"),
			
 
				+            func.coalesce(
			
 
				+                func.sum(case((PrintLogEntry.status == "completed", PrintArchive.quantity), else_=0)),
			
 
				+                0,
			
 
				+            ).label("completed_items"),
			
 
				+            func.coalesce(
			
 
				+                func.sum(case((PrintLogEntry.status.in_(_FAILURE_STATUSES), 1), else_=0)),
			
 
				+                0,
			
 
				+            ).label("failed_runs"),
			
 
				+        )
			
 
				+        .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
			
 
				+        .where(PrintArchive.project_id == project_id)
			
 
				     )
			
 
				-    sums = sums_result.first()
			
 
				+    items_split = items_split_result.first()
			
 
				+    total_items = int(items_split.total_items or 0)
			
 
				+    completed_items = int(items_split.completed_items or 0)
			
 
				+    failed_prints = int(items_split.failed_runs or 0)
			
 
				 
			
 
				     # Count queued items
			
 
				     queued_result = await db.execute(
			
@@ -98,15 +126,6 @@ async def compute_project_stats(
 
				     )
			
 
				     in_progress_prints = in_progress_result.scalar() or 0
			
 
				 
			
 
				-    # Sum completed items (parts) - sum of quantities for actually printed jobs
			
 
				-    completed_items_result = await db.execute(
			
 
				-        select(func.coalesce(func.sum(PrintArchive.quantity), 0)).where(
			
 
				-            PrintArchive.project_id == project_id,
			
 
				-            PrintArchive.status == "completed",
			
 
				-        )
			
 
				-    )
			
 
				-    completed_items = int(completed_items_result.scalar() or 0)
			
 
				-
			
 
				     # Calculate progress for plates (target_count vs total_archives)
			
 
				     progress_percent = None
			
 
				     remaining_prints = None
			
@@ -140,13 +159,13 @@ async def compute_project_stats(
 
				         failed_prints=int(failed_prints),
			
 
				         queued_prints=queued_prints,
			
 
				         in_progress_prints=in_progress_prints,
			
 
				-        total_print_time_hours=round((sums.total_time or 0) / 3600, 2),
			
 
				-        total_filament_grams=round(sums.total_filament or 0, 2),
			
 
				+        total_print_time_hours=round((log_stats.total_time or 0) / 3600, 2),
			
 
				+        total_filament_grams=round(log_stats.total_filament or 0, 2),
			
 
				         progress_percent=progress_percent,
			
 
				         parts_progress_percent=parts_progress_percent,
			
 
				-        estimated_cost=round((sums.total_filament_cost or 0), 2),
			
 
				-        total_energy_kwh=round((sums.total_energy or 0), 3),
			
 
				-        total_energy_cost=round((sums.total_energy_cost or 0), 3),
			
 
				+        estimated_cost=round((log_stats.total_filament_cost or 0), 2),
			
 
				+        total_energy_kwh=round((log_stats.total_energy or 0), 3),
			
 
				+        total_energy_cost=round((log_stats.total_energy_cost or 0), 3),
			
 
				         remaining_prints=remaining_prints,
			
 
				         remaining_parts=remaining_parts,
			
 
				         bom_total_items=bom_stats.total or 0,
			
@@ -171,20 +190,34 @@ async def list_projects(
 
				     result = await db.execute(query)
			
 
				     projects = result.scalars().all()
			
 
				 
			
 
				-    # Compute quick stats for each project
			
 
				+    # Compute quick stats for each project. Same per-run aggregation as
			
 
				+    # ``compute_project_stats`` — counts and quantities come from
			
 
				+    # ``print_log_entries`` joined to ``print_archives`` so reprints and
			
 
				+    # multi-plate prints contribute every run, not just the source file
			
 
				+    # (#1593). Quick stats and the full stats endpoint must agree.
			
 
				     response = []
			
 
				     for project in projects:
			
 
				-        # Get archive count (number of print jobs)
			
 
				-        archive_count_result = await db.execute(
			
 
				-            select(func.count(PrintArchive.id)).where(PrintArchive.project_id == project.id)
			
 
				-        )
			
 
				-        archive_count = archive_count_result.scalar() or 0
			
 
				-
			
 
				-        # Get total items (sum of quantities)
			
 
				-        total_items_result = await db.execute(
			
 
				-            select(func.coalesce(func.sum(PrintArchive.quantity), 0)).where(PrintArchive.project_id == project.id)
			
 
				+        log_quick_result = await db.execute(
			
 
				+            select(
			
 
				+                func.count(PrintLogEntry.id).label("archive_count"),
			
 
				+                func.coalesce(func.sum(PrintArchive.quantity), 0).label("total_items"),
			
 
				+                func.coalesce(
			
 
				+                    func.sum(case((PrintLogEntry.status == "completed", PrintArchive.quantity), else_=0)),
			
 
				+                    0,
			
 
				+                ).label("completed_count"),
			
 
				+                func.coalesce(
			
 
				+                    func.sum(case((PrintLogEntry.status.in_(_FAILURE_STATUSES), 1), else_=0)),
			
 
				+                    0,
			
 
				+                ).label("failed_count"),
			
 
				+            )
			
 
				+            .join(PrintArchive, PrintArchive.id == PrintLogEntry.archive_id)
			
 
				+            .where(PrintArchive.project_id == project.id)
			
 
				         )
			
 
				-        total_items = int(total_items_result.scalar() or 0)
			
 
				+        log_quick = log_quick_result.first()
			
 
				+        archive_count = int(log_quick.archive_count or 0)
			
 
				+        total_items = int(log_quick.total_items or 0)
			
 
				+        completed_count = int(log_quick.completed_count or 0)
			
 
				+        failed_count = int(log_quick.failed_count or 0)
			
 
				 
			
 
				         # Get queue count
			
 
				         queue_count_result = await db.execute(
			
@@ -195,24 +228,6 @@ async def list_projects(
 
				         )
			
 
				         queue_count = queue_count_result.scalar() or 0
			
 
				 
			
 
				-        # Sum completed parts (quantities) - only actually printed jobs
			
 
				-        completed_result = await db.execute(
			
 
				-            select(func.coalesce(func.sum(PrintArchive.quantity), 0)).where(
			
 
				-                PrintArchive.project_id == project.id,
			
 
				-                PrintArchive.status == "completed",
			
 
				-            )
			
 
				-        )
			
 
				-        completed_count = int(completed_result.scalar() or 0)
			
 
				-
			
 
				-        # Sum failed parts (quantities) - includes all failure states
			
 
				-        failed_result = await db.execute(
			
 
				-            select(func.coalesce(func.sum(PrintArchive.quantity), 0)).where(
			
 
				-                PrintArchive.project_id == project.id,
			
 
				-                PrintArchive.status.in_(["failed", "aborted", "cancelled", "stopped"]),
			
 
				-            )
			
 
				-        )
			
 
				-        failed_count = int(failed_result.scalar() or 0)
			
 
				-
			
 
				         # Plates progress: archive_count / target_count
			
 
				         progress_percent = None
			
 
				         if project.target_count and project.target_count > 0:
			
@@ -686,9 +701,13 @@ async def list_project_archives(
 
				     archives = result.scalars().all()
			
 
				 
			
 
				     # Import the response converter from archives module
			
 
				-    from backend.app.api.routes.archives import archive_to_response
			
 
				+    from backend.app.api.routes.archives import _load_run_aggregates, archive_to_response
			
 
				+
			
 
				+    # Load run aggregates so multi-run archives' time/accuracy badge is
			
 
				+    # suppressed consistently with the main archives list endpoint (#1608).
			
 
				+    run_aggregates = await _load_run_aggregates(db, [a.id for a in archives])
			
 
				 
			
 
				-    return [archive_to_response(a) for a in archives]
			
 
				+    return [archive_to_response(a, run_aggregate=run_aggregates.get(a.id)) for a in archives]
			
 
				 
			
 
				 
			
 
				 @router.get("/{project_id}/queue")
			
@@ -892,7 +911,7 @@ async def upload_attachment(
 
				 
			
 
				     # Generate unique filename
			
 
				     unique_filename = f"{uuid.uuid4().hex}{ext}"
			
 
				-    file_path = attachments_dir / unique_filename
			
 
				+    file_path = attachments_dir / unique_filename  # SEC-PATH-OK: unique_filename = uuid.uuid4().hex + ext
			
 
				 
			
 
				     # Save file
			
 
				     try:
			
@@ -964,7 +983,9 @@ async def download_attachment(
 
				         raise HTTPException(status_code=404, detail="Attachment not found")
			
 
				 
			
 
				     # Check file exists
			
 
				-    file_path = get_project_attachments_dir(project_id) / filename
			
 
				+    file_path = (
			
 
				+        get_project_attachments_dir(project_id) / filename
			
 
				+    )  # SEC-PATH-OK: filename validated above (no /, \\, .., empty) + attachment membership check
			
 
				     if not file_path.exists():
			
 
				         raise HTTPException(status_code=404, detail="Attachment file not found")
			
 
				 
			
@@ -1004,7 +1025,9 @@ async def delete_attachment(
 
				     project.attachments = attachments if attachments else None
			
 
				 
			
 
				     # Delete file
			
 
				-    file_path = get_project_attachments_dir(project_id) / filename
			
 
				+    file_path = (
			
 
				+        get_project_attachments_dir(project_id) / filename
			
 
				+    )  # SEC-PATH-OK: filename validated above (no /, \\, .., empty) + attachment membership check
			
 
				     if file_path.exists():
			
 
				         try:
			
 
				             os.remove(file_path)
			
@@ -1066,7 +1089,7 @@ async def upload_project_cover_image(
 
				                 logger.warning("Failed to delete old cover image %s: %s", old_path, e)
			
 
				 
			
 
				     unique_filename = f"cover_{uuid.uuid4().hex}{ext}"
			
 
				-    file_path = attachments_dir / unique_filename
			
 
				+    file_path = attachments_dir / unique_filename  # SEC-PATH-OK: unique_filename = f"cover_{uuid.uuid4().hex}{ext}"
			
 
				     try:
			
 
				         with open(file_path, "wb") as f:
			
 
				             content = await file.read()
			
@@ -1827,6 +1850,13 @@ async def import_project_file(
 
				         if not folder_name:
			
 
				             continue
			
 
				 
			
 
				+        # Containment check on the folder name — refuses absolute paths and
			
 
				+        # ``..`` traversal in ``project.json[linked_folders[*].name]``. The
			
 
				+        # previous code did ``library_dir / folder_name`` directly, which
			
 
				+        # collapses to ``Path(folder_name)`` when folder_name is absolute
			
 
				+        # and lets ``..`` escape after mkdir.
			
 
				+        folder_path = safe_join_under(library_dir, folder_name)
			
 
				+
			
 
				         # Check if folder exists
			
 
				         existing_result = await db.execute(
			
 
				             select(LibraryFolder).where(
			
@@ -1853,7 +1883,6 @@ async def import_project_file(
 
				             await db.flush()
			
 
				 
			
 
				             # Create folder on disk
			
 
				-            folder_path = library_dir / folder_name
			
 
				             folder_path.mkdir(parents=True, exist_ok=True)
			
 
				 
			
 
				         # Import files for this folder from ZIP
			
@@ -1868,8 +1897,18 @@ async def import_project_file(
 
				             if not relative_path:
			
 
				                 continue
			
 
				 
			
 
				-            # Write file to disk
			
 
				-            file_disk_path = library_dir / folder_name / relative_path
			
 
				+            # Containment check on the per-entry relative path. ZIP names
			
 
				+            # can carry ``..`` segments by spec; without resolve + parent
			
 
				+            # containment, ``files/<folder>/../../../etc/x`` escapes
			
 
				+            # ``library_dir`` entirely. ``relative_path`` is split into
			
 
				+            # parts because ``safe_join_under`` rejects parts that start
			
 
				+            # with ``/``, and a single combined string would hide an
			
 
				+            # embedded ``..`` segment behind a forward slash.
			
 
				+            file_disk_path = safe_join_under(
			
 
				+                library_dir,
			
 
				+                folder_name,
			
 
				+                *Path(relative_path).parts,
			
 
				+            )
			
 
				             file_disk_path.parent.mkdir(parents=True, exist_ok=True)
			
 
				             file_disk_path.write_bytes(file_content)
			
 
				 
			
--- a/backend/app/api/routes/settings.py
+++ b/backend/app/api/routes/settings.py
@@ -361,12 +361,20 @@ async def get_ui_preferences(db: AsyncSession = Depends(get_db)):
 
				 
			
 
				 
			
 
				 @router.get("/check-ffmpeg")
			
 
				-async def check_ffmpeg():
			
 
				-    """Check if ffmpeg is installed and available."""
			
 
				+async def check_ffmpeg(
			
 
				+    _: User | None = RequirePermissionIfAuthEnabled(Permission.SETTINGS_READ),
			
 
				+):
			
 
				+    """Check if ffmpeg is installed and available.
			
 
				+
			
 
				+    Gated on ``SETTINGS_READ`` (audit finding I4 — the binary path was
			
 
				+    leaking the host filesystem layout to unauthenticated callers).
			
 
				+    ``require_permission_if_auth_enabled`` returns ``None`` only when
			
 
				+    auth is disabled (in which case there's no privacy boundary to
			
 
				+    enforce); otherwise it raises 401/403 before we get here.
			
 
				+    """
			
 
				     from backend.app.services.camera import get_ffmpeg_path
			
 
				 
			
 
				     ffmpeg_path = get_ffmpeg_path()
			
 
				-
			
 
				     return {
			
 
				         "installed": ffmpeg_path is not None,
			
 
				         "path": ffmpeg_path,
			
@@ -565,7 +573,9 @@ async def create_backup_zip(output_path: Path | None = None) -> tuple[Path, str]
 
				         for name, src_dir in dirs_to_backup:
			
 
				             if src_dir.exists() and any(src_dir.iterdir()):
			
 
				                 try:
			
 
				-                    shutil.copytree(src_dir, temp_path / name)
			
 
				+                    shutil.copytree(
			
 
				+                        src_dir, temp_path / name
			
 
				+                    )  # SEC-PATH-OK: name iterates the dirs_to_backup tuple of constant strings ("archive", "virtual_printer", ...)
			
 
				                 except shutil.Error as e:
			
 
				                     logger.warning("Some files in %s could not be copied: %s", name, e)
			
 
				                 except PermissionError as e:
			
@@ -591,7 +601,9 @@ async def create_backup_zip(output_path: Path | None = None) -> tuple[Path, str]
 
				 
			
 
				         # Create ZIP
			
 
				         if output_path is not None:
			
 
				-            zip_file = output_path / filename
			
 
				+            zip_file = (
			
 
				+                output_path / filename
			
 
				+            )  # SEC-PATH-OK: filename = f"bambuddy-backup-{datetime.now()...}.zip" generated in create_backup_zip itself
			
 
				         else:
			
 
				             fd, tmp = tempfile.mkstemp(suffix=".zip")
			
 
				             os.close(fd)
			
@@ -861,7 +873,9 @@ async def restore_backup(
 
				                     # Reject path-traversal payloads: any entry whose resolved
			
 
				                     # path escapes temp_path would allow writing arbitrary files
			
 
				                     # on the host (ZipSlip / CVE-2006-5456).
			
 
				-                    dest = (temp_path / name).resolve()
			
 
				+                    dest = (
			
 
				+                        temp_path / name
			
 
				+                    ).resolve()  # SEC-PATH-OK: is_relative_to containment check below before extractall
			
 
				                     # is_relative_to (Python 3.9+) covers both relative
			
 
				                     # path-traversal (../etc/passwd) and absolute-path overrides
			
 
				                     # (/etc/passwd) — str.startswith was vulnerable to
			
@@ -995,7 +1009,9 @@ async def restore_backup(
 
				 
			
 
				             skipped_dirs = []
			
 
				             for name, dest_dir in dirs_to_restore:
			
 
				-                src_dir = temp_path / name
			
 
				+                src_dir = (
			
 
				+                    temp_path / name
			
 
				+                )  # SEC-PATH-OK: name iterates the dirs_to_restore tuple of constant strings ("archive", "virtual_printer", ...)
			
 
				                 if src_dir.exists():
			
 
				                     logger.info("Restoring %s directory...", name)
			
 
				                     try:
			
@@ -1108,10 +1124,14 @@ async def get_virtual_printer_settings(
 
				     tailscale_disabled_raw = await get_setting(db, "virtual_printer_tailscale_disabled")
			
 
				     archive_name_source = await get_setting(db, "virtual_printer_archive_name_source")
			
 
				 
			
 
				+    from backend.app.models.virtual_printer import VP_MODE_ARCHIVE, normalize_vp_mode
			
 
				+
			
 
				     return {
			
 
				         "enabled": enabled == "true" if enabled else False,
			
 
				         "access_code_set": bool(access_code),
			
 
				-        "mode": mode or "immediate",
			
 
				+        # Normalize on read so older settings rows (with `immediate` /
			
 
				+        # `print_queue`) come out as `archive` / `queue` for the frontend.
			
 
				+        "mode": normalize_vp_mode(mode) or VP_MODE_ARCHIVE,
			
 
				         "model": model or DEFAULT_VIRTUAL_PRINTER_MODEL,
			
 
				         "target_printer_id": int(target_printer_id) if target_printer_id else None,
			
 
				         "remote_interface_ip": remote_interface_ip or "",
			
@@ -1152,7 +1172,9 @@ async def update_virtual_printer_settings(
 
				     # Get current values
			
 
				     current_enabled = await get_setting(db, "virtual_printer_enabled") == "true"
			
 
				     current_access_code = await get_setting(db, "virtual_printer_access_code") or ""
			
 
				-    current_mode = await get_setting(db, "virtual_printer_mode") or "immediate"
			
 
				+    # Default to `archive` (the canonical name) but tolerate legacy `immediate`
			
 
				+    # in the stored value — normalized later before validation.
			
 
				+    current_mode = await get_setting(db, "virtual_printer_mode") or "archive"
			
 
				     current_model = await get_setting(db, "virtual_printer_model") or DEFAULT_VIRTUAL_PRINTER_MODEL
			
 
				     current_target_id_str = await get_setting(db, "virtual_printer_target_printer_id")
			
 
				     current_target_id = int(current_target_id_str) if current_target_id_str else None
			
@@ -1170,15 +1192,21 @@ async def update_virtual_printer_settings(
 
				     new_remote_iface = remote_interface_ip if remote_interface_ip is not None else current_remote_iface
			
 
				     new_ts_disabled = tailscale_disabled if tailscale_disabled is not None else current_ts_disabled
			
 
				 
			
 
				-    # Validate mode
			
 
				-    # "review" is the new name for "queue" (pending review before archiving)
			
 
				-    # "print_queue" archives and adds to print queue (unassigned)
			
 
				-    # "proxy" is transparent TCP proxy to a real printer
			
 
				-    if new_mode not in ("immediate", "queue", "review", "print_queue", "proxy"):
			
 
				+    # Validate mode. Canonical wire values are `archive` / `review` / `queue`
			
 
				+    # / `proxy`; legacy `immediate` and `print_queue` are accepted as aliases
			
 
				+    # and translated before storage so support bundles stop showing the old
			
 
				+    # confusing pair (#1429 mode-label discrepancy).
			
 
				+    from backend.app.models.virtual_printer import VP_MODE_VALUES, normalize_vp_mode
			
 
				+
			
 
				+    canonical_mode = normalize_vp_mode(new_mode)
			
 
				+    if canonical_mode not in VP_MODE_VALUES:
			
 
				         return JSONResponse(
			
 
				             status_code=400,
			
 
				-            content={"detail": "Mode must be 'immediate', 'review', 'print_queue', or 'proxy'"},
			
 
				+            content={
			
 
				+                "detail": f"Mode must be one of: {', '.join(VP_MODE_VALUES)}",
			
 
				+            },
			
 
				         )
			
 
				+    new_mode = canonical_mode
			
 
				 
			
 
				     # Validate archive_name_source
			
 
				     if archive_name_source is not None and archive_name_source not in ("metadata", "filename"):
			
@@ -1186,9 +1214,6 @@ async def update_virtual_printer_settings(
 
				             status_code=400,
			
 
				             content={"detail": "archive_name_source must be 'metadata' or 'filename'"},
			
 
				         )
			
 
				-    # Normalize legacy "queue" to "review" for storage
			
 
				-    if new_mode == "queue":
			
 
				-        new_mode = "review"
			
 
				 
			
 
				     # Validate model
			
 
				     if model is not None and model not in VIRTUAL_PRINTER_MODELS:
			
--- a/backend/app/api/routes/slicer_presets.py
+++ b/backend/app/api/routes/slicer_presets.py
@@ -16,7 +16,7 @@ import json
 
				 import logging
			
 
				 import time
			
 
				 
			
 
				-from fastapi import APIRouter, Depends, File, HTTPException, UploadFile
			
 
				+from fastapi import APIRouter, Depends, File, HTTPException, Query, UploadFile
			
 
				 from sqlalchemy import select
			
 
				 from sqlalchemy.ext.asyncio import AsyncSession
			
 
				 
			
@@ -88,7 +88,9 @@ def _empty_slots() -> dict[str, list[UnifiedPreset]]:
 
				     return {"printer": [], "process": [], "filament": []}
			
 
				 
			
 
				 
			
 
				-async def _fetch_cloud_presets(db: AsyncSession, user: User | None) -> tuple[dict[str, list[UnifiedPreset]], str]:
			
 
				+async def _fetch_cloud_presets(
			
 
				+    db: AsyncSession, user: User | None, *, refresh: bool = False
			
 
				+) -> tuple[dict[str, list[UnifiedPreset]], str]:
			
 
				     """Return (slots, cloud_status). Slots are empty when cloud_status != 'ok'.
			
 
				 
			
 
				     Defence-in-depth: even if a stored cloud_token survived a permission
			
@@ -96,6 +98,12 @@ async def _fetch_cloud_presets(db: AsyncSession, user: User | None) -> tuple[dic
 
				     treated as not-authenticated for this endpoint — the cloud tier never
			
 
				     surfaces for them. This keeps the per-tier visibility consistent with the
			
 
				     /cloud/* endpoint suite that already gates on CLOUD_AUTH.
			
 
				+
			
 
				+    ``refresh=True`` skips the in-process cache for this call (used by the
			
 
				+    SliceModal's manual Refresh button so a user who just deleted a preset
			
 
				+    in Bambu Studio / Handy can pick up the change without waiting for the
			
 
				+    5-minute TTL to expire). The fresh result is still written back to the
			
 
				+    cache so subsequent non-refresh callers benefit.
			
 
				     """
			
 
				     if user is not None and not user.has_permission(Permission.CLOUD_AUTH.value):
			
 
				         return _empty_slots(), "not_authenticated"
			
@@ -107,9 +115,10 @@ async def _fetch_cloud_presets(db: AsyncSession, user: User | None) -> tuple[dic
 
				     user_key = user.id if user is not None else 0
			
 
				     cache_key = (user_key, _token_fingerprint(token))
			
 
				     now = time.monotonic()
			
 
				-    cached = _cloud_cache.get(cache_key)
			
 
				-    if cached and now - cached[0] < _CLOUD_TTL_S:
			
 
				-        return cached[1], "ok"
			
 
				+    if not refresh:
			
 
				+        cached = _cloud_cache.get(cache_key)
			
 
				+        if cached and now - cached[0] < _CLOUD_TTL_S:
			
 
				+            return cached[1], "ok"
			
 
				 
			
 
				     cloud = BambuCloudService(region=region)
			
 
				     cloud.set_token(token)
			
@@ -227,11 +236,15 @@ def _first_scalar(value: object) -> str | None:
 
				     return None
			
 
				 
			
 
				 
			
 
				-async def _fetch_bundled_presets(db: AsyncSession) -> dict[str, list[UnifiedPreset]]:
			
 
				-    """Standard slicer-bundled profiles via the sidecar's /profiles/bundled."""
			
 
				+async def _fetch_bundled_presets(db: AsyncSession, *, refresh: bool = False) -> dict[str, list[UnifiedPreset]]:
			
 
				+    """Standard slicer-bundled profiles via the sidecar's /profiles/bundled.
			
 
				+
			
 
				+    ``refresh=True`` skips the in-process cache; see _fetch_cloud_presets for
			
 
				+    the same shape and rationale.
			
 
				+    """
			
 
				     global _bundled_cache
			
 
				     now = time.monotonic()
			
 
				-    if _bundled_cache and now - _bundled_cache[0] < _BUNDLED_TTL_S:
			
 
				+    if not refresh and _bundled_cache and now - _bundled_cache[0] < _BUNDLED_TTL_S:
			
 
				         return _bundled_cache[1]
			
 
				 
			
 
				     api_url = await _resolve_slicer_api_url(db)
			
@@ -383,6 +396,15 @@ async def list_unified_presets(
 
				     db: AsyncSession = Depends(get_db),
			
 
				     current_user: User | None = RequirePermissionIfAuthEnabled(Permission.LIBRARY_UPLOAD),
			
 
				     api_key_cloud_owner: User | None = Depends(resolve_api_key_cloud_owner),
			
 
				+    refresh: bool = Query(
			
 
				+        False,
			
 
				+        description=(
			
 
				+            "Bypass the in-process cloud and bundled-preset caches for this "
			
 
				+            "request. The SliceModal's Refresh button sets this so users who "
			
 
				+            "deleted a preset in Bambu Studio or Bambu Handy don't have to "
			
 
				+            "wait for the 5-minute cloud-cache TTL to expire."
			
 
				+        ),
			
 
				+    ),
			
 
				 ) -> UnifiedPresetsResponse:
			
 
				     """List slicer presets across cloud / local / standard tiers, deduped by name.
			
 
				 
			
@@ -399,9 +421,9 @@ async def list_unified_presets(
 
				     too — matching the slice route (#1182 follow-up).
			
 
				     """
			
 
				     cloud_token_user = current_user or api_key_cloud_owner
			
 
				-    cloud, cloud_status = await _fetch_cloud_presets(db, cloud_token_user)
			
 
				+    cloud, cloud_status = await _fetch_cloud_presets(db, cloud_token_user, refresh=refresh)
			
 
				     local = await _fetch_local_presets(db)
			
 
				-    standard = await _fetch_bundled_presets(db)
			
 
				+    standard = await _fetch_bundled_presets(db, refresh=refresh)
			
 
				 
			
 
				     cloud, local, standard = _dedupe_by_name(cloud, local, standard)
			
 
				 
			
--- a/backend/app/api/routes/spoolbuddy.py
+++ b/backend/app/api/routes/spoolbuddy.py
@@ -867,15 +867,28 @@ async def update_spool_weight(
 
				     db: AsyncSession = Depends(get_db),
			
 
				     _: User | None = RequirePermissionIfAuthEnabled(Permission.INVENTORY_UPDATE),
			
 
				 ):
			
 
				-    """Update spool's used weight from scale reading."""
			
 
				+    """Update spool's used weight from scale reading.
			
 
				+
			
 
				+    Routes the update to whichever inventory backend Bambuddy is configured
			
 
				+    for: Spoolman exclusively when ``spoolman_enabled`` is true, local DB
			
 
				+    exclusively otherwise. The previous implementation tried local first and
			
 
				+    only consulted Spoolman on a local-DB miss, which meant a stale local row
			
 
				+    sharing a numeric id with a Spoolman spool would silently absorb the
			
 
				+    update while the Spoolman row the user is actually looking at stayed
			
 
				+    unchanged (#1530). Mirrors the routing already used by ``nfc/tag-scanned``.
			
 
				+    """
			
 
				     from backend.app.api.routes._spoolman_helpers import _safe_float
			
 
				     from backend.app.models.spool import Spool
			
 
				 
			
 
				-    # Try local DB first — local spool IDs must not be forwarded to Spoolman.
			
 
				-    db_result = await db.execute(select(Spool).where(Spool.id == req.spool_id))
			
 
				-    spool = db_result.scalar_one_or_none()
			
 
				+    sm_client = await _get_spoolman_client_or_none(db)
			
 
				+
			
 
				+    if sm_client is None:
			
 
				+        # Local mode — exclusive update, no Spoolman fallback.
			
 
				+        db_result = await db.execute(select(Spool).where(Spool.id == req.spool_id))
			
 
				+        spool = db_result.scalar_one_or_none()
			
 
				+        if not spool:
			
 
				+            raise HTTPException(status_code=404, detail="Spool not found")
			
 
				 
			
 
				-    if spool:
			
 
				         net_filament = max(0, req.weight_grams - spool.core_weight)
			
 
				         spool.weight_used = max(0, spool.label_weight - net_filament)
			
 
				         spool.last_scale_weight = req.weight_grams
			
@@ -889,11 +902,7 @@ async def update_spool_weight(
 
				         )
			
 
				         return {"status": "ok", "weight_used": spool.weight_used}
			
 
				 
			
 
				-    # Local miss — fall back to Spoolman when enabled.
			
 
				-    sm_client = await _get_spoolman_client_or_none(db)
			
 
				-    if sm_client is None:
			
 
				-        raise HTTPException(status_code=404, detail="Spool not found")
			
 
				-
			
 
				+    # Spoolman mode — exclusive update, never touch local DB.
			
 
				     async with _translate_spoolbuddy_errors():
			
 
				         sm_spool = await sm_client.get_spool(req.spool_id)
			
 
				 
			
--- a/backend/app/api/routes/system.py
+++ b/backend/app/api/routes/system.py
@@ -19,6 +19,7 @@ from backend.app.core.database import get_db
 
				 from backend.app.core.permissions import Permission
			
 
				 from backend.app.models.archive import PrintArchive
			
 
				 from backend.app.models.filament import Filament
			
 
				+from backend.app.models.print_log import PrintLogEntry
			
 
				 from backend.app.models.printer import Printer
			
 
				 from backend.app.models.project import Project
			
 
				 from backend.app.models.smart_plug import SmartPlug
			
@@ -416,18 +417,22 @@ async def get_system_info(
 
				     failed_count = await db.scalar(select(func.count(PrintArchive.id)).where(PrintArchive.status == "failed"))
			
 
				     printing_count = await db.scalar(select(func.count(PrintArchive.id)).where(PrintArchive.status == "printing"))
			
 
				 
			
 
				-    # Total print time
			
 
				+    # System-wide totals aggregate per-run from ``print_log_entries`` so
			
 
				+    # reprints contribute each run and multi-plate sums are pulled from the
			
 
				+    # measured per-run actuals — same source the per-archive stats and the
			
 
				+    # project rollup use (#1593). Pre-fix this summed ``PrintArchive`` directly,
			
 
				+    # which under-reported the same way the project page did (3 reprints of
			
 
				+    # one file showed as one file's worth of filament/time).
			
 
				     total_print_time = (
			
 
				         await db.scalar(
			
 
				-            select(func.sum(PrintArchive.print_time_seconds)).where(PrintArchive.print_time_seconds.isnot(None))
			
 
				+            select(func.sum(PrintLogEntry.duration_seconds)).where(PrintLogEntry.duration_seconds.isnot(None))
			
 
				         )
			
 
				         or 0
			
 
				     )
			
 
				 
			
 
				-    # Total filament used
			
 
				     total_filament = (
			
 
				         await db.scalar(
			
 
				-            select(func.sum(PrintArchive.filament_used_grams)).where(PrintArchive.filament_used_grams.isnot(None))
			
 
				+            select(func.sum(PrintLogEntry.filament_used_grams)).where(PrintLogEntry.filament_used_grams.isnot(None))
			
 
				         )
			
 
				         or 0
			
 
				     )
			
--- a/backend/app/api/routes/virtual_printers.py
+++ b/backend/app/api/routes/virtual_printers.py
@@ -33,7 +33,7 @@ class TailscaleStatusResponse(BaseModel):
 
				 class VirtualPrinterCreate(BaseModel):
			
 
				     name: str = "Bambuddy"
			
 
				     enabled: bool = False
			
 
				-    mode: str = "immediate"
			
 
				+    mode: str = "archive"
			
 
				     model: str | None = None
			
 
				     access_code: str | None = None
			
 
				     target_printer_id: int | None = None
			
@@ -133,12 +133,14 @@ async def create_virtual_printer(
 
				     _: User | None = RequirePermissionIfAuthEnabled(Permission.SETTINGS_UPDATE),
			
 
				 ):
			
 
				     """Create a new virtual printer."""
			
 
				-    from backend.app.models.virtual_printer import VirtualPrinter
			
 
				+    from backend.app.models.virtual_printer import VP_MODE_VALUES, VirtualPrinter, normalize_vp_mode
			
 
				     from backend.app.services.virtual_printer import VIRTUAL_PRINTER_MODELS, virtual_printer_manager
			
 
				     from backend.app.services.virtual_printer.manager import DEFAULT_VIRTUAL_PRINTER_MODEL
			
 
				 
			
 
				-    # Validate mode
			
 
				-    if body.mode not in ("immediate", "review", "print_queue", "proxy"):
			
 
				+    # Accept both canonical and legacy wire values so older clients (forks /
			
 
				+    # mobile shortcuts / scripted setups) still work; normalize before write.
			
 
				+    body.mode = normalize_vp_mode(body.mode) or body.mode
			
 
				+    if body.mode not in VP_MODE_VALUES:
			
 
				         return JSONResponse(status_code=400, content={"detail": "Invalid mode"})
			
 
				 
			
 
				     # Validate model
			
@@ -335,10 +337,17 @@ async def update_virtual_printer(
 
				     if not vp:
			
 
				         return JSONResponse(status_code=404, content={"detail": "Virtual printer not found"})
			
 
				 
			
 
				+    # Redact the access code before logging — model_dump otherwise includes
			
 
				+    # the plaintext value at DEBUG, violating the project no-secrets-in-logs
			
 
				+    # rule. Replace with a marker that still signals "the user changed it"
			
 
				+    # vs "the user didn't touch this field".
			
 
				+    _safe_body = body.model_dump(exclude_unset=True)
			
 
				+    if "access_code" in _safe_body:
			
 
				+        _safe_body["access_code"] = "***"
			
 
				     logger.debug(
			
 
				         "Update VP %d: body=%s, current state: mode=%s, enabled=%s, access_code_set=%s, bind_ip=%s, target=%s",
			
 
				         vp_id,
			
 
				-        body.model_dump(exclude_unset=True),
			
 
				+        _safe_body,
			
 
				         vp.mode,
			
 
				         vp.enabled,
			
 
				         bool(vp.access_code),
			
@@ -350,9 +359,12 @@ async def update_virtual_printer(
 
				     if body.name is not None:
			
 
				         vp.name = body.name
			
 
				     if body.mode is not None:
			
 
				-        if body.mode not in ("immediate", "review", "print_queue", "proxy"):
			
 
				+        from backend.app.models.virtual_printer import VP_MODE_VALUES, normalize_vp_mode
			
 
				+
			
 
				+        canonical_mode = normalize_vp_mode(body.mode) or body.mode
			
 
				+        if canonical_mode not in VP_MODE_VALUES:
			
 
				             return JSONResponse(status_code=400, content={"detail": "Invalid mode"})
			
 
				-        vp.mode = body.mode
			
 
				+        vp.mode = canonical_mode
			
 
				     if body.model is not None:
			
 
				         if body.model not in VIRTUAL_PRINTER_MODELS:
			
 
				             return JSONResponse(
			
@@ -492,10 +504,35 @@ async def delete_virtual_printer(
 
				     # Stop instance if running
			
 
				     await virtual_printer_manager.remove_instance(vp_id)
			
 
				 
			
 
				+    # Mark any PendingUpload rows that referenced this VP's upload_dir as
			
 
				+    # discarded — without this the rows live on as phantom entries in
			
 
				+    # /pending-uploads/ pointing at file paths that no longer exist, and
			
 
				+    # the user only learns they're orphaned by trying to archive one and
			
 
				+    # getting a flip-to-discarded on file-missing.
			
 
				+    upload_prefix = str(virtual_printer_manager._base_dir / "uploads" / str(vp_id))
			
 
				+    try:
			
 
				+        from backend.app.models.pending_upload import PendingUpload
			
 
				+
			
 
				+        stale = await db.execute(select(PendingUpload).where(PendingUpload.file_path.startswith(upload_prefix)))
			
 
				+        for pending in stale.scalars().all():
			
 
				+            pending.status = "discarded"
			
 
				+        await db.flush()
			
 
				+    except Exception as e:
			
 
				+        logger.error("Failed to discard orphan PendingUpload rows for VP %d: %s", vp_id, e)
			
 
				+
			
 
				     # Delete from DB
			
 
				     await db.execute(sql_delete(VirtualPrinter).where(VirtualPrinter.id == vp_id))
			
 
				     await db.commit()
			
 
				 
			
 
				+    # Remove the on-disk upload directory after the DB commit succeeds, so
			
 
				+    # a crash between commit and rmtree only leaves orphan files (vs orphan
			
 
				+    # rows pointing at a now-missing tree).
			
 
				+    upload_dir = virtual_printer_manager._base_dir / "uploads" / str(vp_id)
			
 
				+    if upload_dir.exists():
			
 
				+        import shutil
			
 
				+
			
 
				+        shutil.rmtree(upload_dir, ignore_errors=True)
			
 
				+
			
 
				     logger.info("Deleted virtual printer: %s (id=%d)", vp_name, vp_id)
			
 
				 
			
 
				     # Resync remaining services
			
--- a/backend/app/api/routes/webhook.py
+++ b/backend/app/api/routes/webhook.py
@@ -196,10 +196,13 @@ async def webhook_stop_print(
 
				     check_printer_access(api_key, printer_id)
			
 
				 
			
 
				     status = printer_manager.get_status(printer_id)
			
 
				-    if not status or not status.get("connected"):
			
 
				+    # `printer_manager.get_status(...)` returns a ``PrinterState`` dataclass
			
 
				+    # (see backend/app/services/bambu_mqtt.py), not a dict — `.get(...)` on it
			
 
				+    # raises AttributeError and surfaces as a generic 500 (#1584).
			
 
				+    if not status or not status.connected:
			
 
				         raise HTTPException(status_code=503, detail="Printer not connected")
			
 
				 
			
 
				-    if status.get("state") != "RUNNING":
			
 
				+    if status.state != "RUNNING":
			
 
				         raise HTTPException(status_code=409, detail="No print in progress")
			
 
				 
			
 
				     try:
			
@@ -224,10 +227,11 @@ async def webhook_cancel_print(
 
				     check_printer_access(api_key, printer_id)
			
 
				 
			
 
				     status = printer_manager.get_status(printer_id)
			
 
				-    if not status or not status.get("connected"):
			
 
				+    # Same dataclass-not-dict shape as stop_print above (#1584).
			
 
				+    if not status or not status.connected:
			
 
				         raise HTTPException(status_code=503, detail="Printer not connected")
			
 
				 
			
 
				-    if status.get("state") not in ["RUNNING", "PAUSE"]:
			
 
				+    if status.state not in ["RUNNING", "PAUSE"]:
			
 
				         raise HTTPException(status_code=409, detail="No print to cancel")
			
 
				 
			
 
				     try:
			
@@ -260,14 +264,18 @@ async def webhook_get_printer_status(
 
				 
			
 
				     status = printer_manager.get_status(printer_id)
			
 
				 
			
 
				+    # `printer_manager.get_status(...)` returns a ``PrinterState`` dataclass —
			
 
				+    # attribute access, not dict lookup. The previous `.get(...)` calls raised
			
 
				+    # AttributeError and surfaced as a generic 500 for any printer that
			
 
				+    # actually had a status row (#1584).
			
 
				     return PrinterStatusResponse(
			
 
				         id=printer.id,
			
 
				         name=printer.name,
			
 
				-        connected=status.get("connected", False) if status else False,
			
 
				-        state=status.get("state") if status else None,
			
 
				-        current_print=status.get("current_print") if status else None,
			
 
				-        progress=status.get("progress") if status else None,
			
 
				-        remaining_time=status.get("remaining_time") if status else None,
			
 
				+        connected=status.connected if status else False,
			
 
				+        state=status.state if status else None,
			
 
				+        current_print=status.current_print if status else None,
			
 
				+        progress=status.progress if status else None,
			
 
				+        remaining_time=status.remaining_time if status else None,
			
 
				     )
			
 
				 
			
 
				 
			
--- a/backend/app/api/routes/websocket.py
+++ b/backend/app/api/routes/websocket.py
@@ -1,7 +1,27 @@
 
				+"""GHSA-r2qv follow-up — WebSocket auth gate.
			
 
				+
			
 
				+Previously ``/api/v1/ws`` accepted *any* network client and immediately
			
 
				+streamed every ``printer_status`` / ``print_start`` / ``print_complete``
			
 
				+/ ``archive_*`` / ``inventory_changed`` broadcast back to it. That is
			
 
				+the GHSA-gc24 shape on a different protocol — anyone who could reach
			
 
				+the HTTP port could subscribe to every printer event in the system.
			
 
				+
			
 
				+This endpoint now validates a short-lived token (minted by
			
 
				+``POST /api/v1/auth/ws-token`` behind ``Permission.WEBSOCKET_CONNECT``)
			
 
				+*before* ``websocket.accept()``. When auth is disabled, no token is
			
 
				+required (the legacy SPA-friendly path). The token is reused across
			
 
				+reconnects within its 60-minute window so a brief network blip does
			
 
				+not require a round-trip to the auth router.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				 import logging
			
 
				 
			
 
				-from fastapi import APIRouter, WebSocket, WebSocketDisconnect
			
 
				+from fastapi import APIRouter, Query, WebSocket, WebSocketDisconnect
			
 
				 
			
 
				+from backend.app.core.auth import is_auth_enabled, verify_websocket_token
			
 
				+from backend.app.core.database import async_session
			
 
				 from backend.app.core.websocket import ws_manager
			
 
				 from backend.app.services.background_dispatch import background_dispatch
			
 
				 from backend.app.services.printer_manager import printer_manager, printer_state_to_dict
			
@@ -9,16 +29,68 @@ from backend.app.services.printer_manager import printer_manager, printer_state_
 
				 logger = logging.getLogger(__name__)
			
 
				 router = APIRouter()
			
 
				 
			
 
				+# 4401 mirrors the WebSocket "unauthorised" application close code
			
 
				+# convention used by Sec-WebSocket-Protocol authors (private-use range
			
 
				+# is 4000-4999 per RFC 6455). The SPA distinguishes 4401 from network
			
 
				+# drops and refetches a token instead of retrying with the old one.
			
 
				+_WS_CLOSE_UNAUTHORIZED = 4401
			
 
				+
			
 
				 
			
 
				 @router.websocket("/ws")
			
 
				-async def websocket_endpoint(websocket: WebSocket):
			
 
				-    """WebSocket endpoint for real-time updates."""
			
 
				-    logger.info("WebSocket client connecting...")
			
 
				+async def websocket_endpoint(websocket: WebSocket, token: str | None = Query(default=None)) -> None:
			
 
				+    """WebSocket endpoint for real-time updates.
			
 
				+
			
 
				+    Connection auth (GHSA-r2qv follow-up):
			
 
				+
			
 
				+    - Auth disabled  → connect without a token, identical to the prior
			
 
				+      behaviour (single-user / local-network deployments).
			
 
				+    - Auth enabled   → ``?token=<value>`` query param must hold an
			
 
				+      unexpired token minted via ``POST /api/v1/auth/ws-token``.
			
 
				+      Missing / invalid / expired token → ``close(code=4401)`` *before*
			
 
				+      ``accept()`` so no ``ws_manager.broadcast`` ever reaches the
			
 
				+      caller (broadcasts walk ``active_connections`` blindly — letting
			
 
				+      an unauthenticated socket into that list is a fan-out leak).
			
 
				+
			
 
				+    The auth check is fail-closed at every error path: a DB exception
			
 
				+    while reading the ``auth_enabled`` setting closes the connection
			
 
				+    rather than admitting the caller.
			
 
				+    """
			
 
				+    # Authenticate before accept() so an unauth caller never lands in
			
 
				+    # ws_manager.active_connections (where broadcasts blindly fan out).
			
 
				+    try:
			
 
				+        async with async_session() as db:
			
 
				+            auth_required = await is_auth_enabled(db)
			
 
				+    except Exception:  # SEC-AUTH-EXC: DB failure on auth probe → fail-closed (refuse connect), matches is_auth_enabled itself which returns True on error
			
 
				+        logger.error("WebSocket auth probe failed; refusing connection", exc_info=True)
			
 
				+        await websocket.close(code=_WS_CLOSE_UNAUTHORIZED)
			
 
				+        return
			
 
				+
			
 
				+    principal: str | None = None
			
 
				+    if auth_required:
			
 
				+        if not token:
			
 
				+            logger.info("WebSocket connect refused: no token (auth enabled)")
			
 
				+            await websocket.close(code=_WS_CLOSE_UNAUTHORIZED)
			
 
				+            return
			
 
				+        principal = await verify_websocket_token(token)
			
 
				+        if principal is None:
			
 
				+            logger.info("WebSocket connect refused: invalid or expired token")
			
 
				+            await websocket.close(code=_WS_CLOSE_UNAUTHORIZED)
			
 
				+            return
			
 
				+
			
 
				+    # Token verified (or auth disabled); now safe to admit the connection.
			
 
				+    logger.info("WebSocket client connecting (principal=%s)", principal if principal else "<anonymous>")
			
 
				     await ws_manager.connect(websocket)
			
 
				+    # Stash on connection state for any future per-message permission
			
 
				+    # logic; today the message handlers are read-only and only respond
			
 
				+    # to the requesting socket, so the stash is informational. The
			
 
				+    # explicit attribute (rather than a side dict) means a future
			
 
				+    # ``broadcast_to_principal()`` helper can filter on it without
			
 
				+    # touching every call site.
			
 
				+    websocket.state.bambuddy_principal = principal
			
 
				     logger.info("WebSocket client connected")
			
 
				 
			
 
				     try:
			
 
				-        # Send initial status of all printers
			
 
				+        # Send initial status of all printers.
			
 
				         statuses = printer_manager.get_all_statuses()
			
 
				         for printer_id, state in statuses.items():
			
 
				             await websocket.send_json(
			
@@ -39,7 +111,7 @@ async def websocket_endpoint(websocket: WebSocket):
 
				             )
			
 
				         logger.info("Sent initial status for %s printers", len(statuses))
			
 
				 
			
 
				-        # Keep connection alive and handle incoming messages
			
 
				+        # Keep connection alive and handle incoming messages.
			
 
				         while True:
			
 
				             data = await websocket.receive_json()
			
 
				 
			
--- a/backend/app/cli.py
+++ b/backend/app/cli.py
@@ -65,6 +65,11 @@ async def kiosk_bootstrap(
 
				             can_queue=False,
			
 
				             can_control_printer=False,
			
 
				             can_read_status=True,
			
 
				+            can_manage_library=False,
			
 
				+            # SpoolBuddy kiosk writes NFC scans / scale readings / system
			
 
				+            # commands via the /spoolbuddy/* routes — all gated by
			
 
				+            # can_manage_inventory now, so the bundled key must opt in.
			
 
				+            can_manage_inventory=True,
			
 
				             printer_ids=None,
			
 
				             enabled=True,
			
 
				             expires_at=None,
			
--- a/backend/app/core/auth.py
+++ b/backend/app/core/auth.py
@@ -24,13 +24,120 @@ from backend.app.models.user import User
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
 
				 
			
 
				-# SETTINGS_READ is intentionally not denied — the SpoolBuddy kiosk reads settings
			
 
				-# via API key (e.g. to sync the UI language).
			
 
				+# GHSA-r2qv-8222-hqg3 (CVSS 9.9) — API key permission enforcement is allowlist-based.
			
 
				+#
			
 
				+# Until 0.2.4.x, ``_check_apikey_permissions`` only consulted the admin denylist
			
 
				+# below. The three documented scope flags on ``APIKey``
			
 
				+# (``can_read_status`` / ``can_queue`` / ``can_control_printer`` / ``can_manage_library``)
			
 
				+# were enforced only by ``check_permission()`` inside ``routes/webhook.py``;
			
 
				+# every other route used ``require_permission_if_auth_enabled`` which fell
			
 
				+# through to the denylist-only path, so an API key with all flags unchecked
			
 
				+# could still stop prints, edit queue items, and read every endpoint not in
			
 
				+# this set. ``require_any_permission_if_auth_enabled`` and
			
 
				+# ``require_ownership_permission`` did not call this helper at all, so admin
			
 
				+# "any-of" routes and ownership-modify routes were entirely ungated for API keys.
			
 
				+#
			
 
				+# Fix: ``_check_apikey_permissions`` now requires every requested permission to
			
 
				+# be present in ``_APIKEY_SCOPE_BY_PERMISSION`` (allowlist), and gates on the
			
 
				+# corresponding scope flag on the API key. Unmapped permissions = 403. This
			
 
				+# means a Permission added to ``core/permissions.py`` without a matching entry
			
 
				+# in ``_APIKEY_SCOPE_BY_PERMISSION`` is automatically denied for API keys —
			
 
				+# the previous denylist shape allowed every new Permission to silently widen
			
 
				+# the API-key surface.
			
 
				+#
			
 
				+# The denylist is retained for documentation / drift-detection only — its
			
 
				+# entries also satisfy "not in the allowlist", so they fail closed regardless.
			
 
				+#
			
 
				+# Mapping rationale (see wiki/features/api-keys.md):
			
 
				+#   can_read_status     → every ``*_READ`` + camera + stats + system + websocket
			
 
				+#   can_queue           → queue write ops + archive reprint
			
 
				+#   can_control_printer → physical printer + smart-plug control
			
 
				+#   can_manage_library  → library upload/own + MakerWorld import (separate
			
 
				+#                         trust level from queue management, hence its own flag)
			
 
				+#   admin-only          → unmapped (default-deny); covers all create/update/
			
 
				+#                         delete of admin resources, settings writes, user/
			
 
				+#                         group/api-key/backup admin ops, discovery scan,
			
 
				+#                         cloud auth, library ALL-ownership perms, purges
			
 
				+_APIKEY_SCOPE_BY_PERMISSION: dict[Permission, str] = {
			
 
				+    # can_read_status — read-only access to status, history, and configuration
			
 
				+    Permission.PRINTERS_READ: "can_read_status",
			
 
				+    Permission.ARCHIVES_READ: "can_read_status",
			
 
				+    Permission.QUEUE_READ: "can_read_status",
			
 
				+    Permission.LIBRARY_READ: "can_read_status",
			
 
				+    Permission.PROJECTS_READ: "can_read_status",
			
 
				+    Permission.FILAMENTS_READ: "can_read_status",
			
 
				+    Permission.INVENTORY_READ: "can_read_status",
			
 
				+    Permission.INVENTORY_VIEW_ASSIGNMENTS: "can_read_status",
			
 
				+    Permission.INVENTORY_FORECAST_READ: "can_read_status",
			
 
				+    Permission.SMART_PLUGS_READ: "can_read_status",
			
 
				+    Permission.CAMERA_VIEW: "can_read_status",
			
 
				+    Permission.MAINTENANCE_READ: "can_read_status",
			
 
				+    Permission.KPROFILES_READ: "can_read_status",
			
 
				+    Permission.NOTIFICATIONS_READ: "can_read_status",
			
 
				+    Permission.NOTIFICATION_TEMPLATES_READ: "can_read_status",
			
 
				+    Permission.EXTERNAL_LINKS_READ: "can_read_status",
			
 
				+    Permission.FIRMWARE_READ: "can_read_status",
			
 
				+    Permission.AMS_HISTORY_READ: "can_read_status",
			
 
				+    Permission.STATS_READ: "can_read_status",
			
 
				+    Permission.STATS_FILTER_BY_USER: "can_read_status",
			
 
				+    Permission.SYSTEM_READ: "can_read_status",
			
 
				+    # SETTINGS_READ stays allowed via read-status so SpoolBuddy kiosks keep
			
 
				+    # working (they need the UI-language setting via API key).
			
 
				+    Permission.SETTINGS_READ: "can_read_status",
			
 
				+    Permission.MAKERWORLD_VIEW: "can_read_status",
			
 
				+    Permission.WEBSOCKET_CONNECT: "can_read_status",
			
 
				+    # can_queue — queue write ops + reprint (which enqueues an existing archive)
			
 
				+    Permission.QUEUE_CREATE: "can_queue",
			
 
				+    Permission.QUEUE_UPDATE_OWN: "can_queue",
			
 
				+    Permission.QUEUE_UPDATE_ALL: "can_queue",
			
 
				+    Permission.QUEUE_DELETE_OWN: "can_queue",
			
 
				+    Permission.QUEUE_DELETE_ALL: "can_queue",
			
 
				+    Permission.QUEUE_REORDER: "can_queue",
			
 
				+    Permission.ARCHIVES_REPRINT_OWN: "can_queue",
			
 
				+    Permission.ARCHIVES_REPRINT_ALL: "can_queue",
			
 
				+    # can_control_printer — physical-world side effects on hardware
			
 
				+    Permission.PRINTERS_CONTROL: "can_control_printer",
			
 
				+    Permission.PRINTERS_FILES: "can_control_printer",
			
 
				+    Permission.PRINTERS_AMS_RFID: "can_control_printer",
			
 
				+    Permission.PRINTERS_CLEAR_PLATE: "can_control_printer",
			
 
				+    Permission.SMART_PLUGS_CONTROL: "can_control_printer",
			
 
				+    # can_manage_library — file-manager scope (upload/rename/delete OWN library
			
 
				+    # entries + MakerWorld import which downloads files into the library).
			
 
				+    # Bulk/ALL-ownership library ops (UPDATE_ALL / DELETE_ALL / PURGE) stay
			
 
				+    # admin-only because they cross the user boundary.
			
 
				+    Permission.LIBRARY_UPLOAD: "can_manage_library",
			
 
				+    Permission.LIBRARY_UPDATE_OWN: "can_manage_library",
			
 
				+    Permission.LIBRARY_DELETE_OWN: "can_manage_library",
			
 
				+    Permission.MAKERWORLD_IMPORT: "can_manage_library",
			
 
				+    # can_manage_inventory — inventory write scope. Covers the documented
			
 
				+    # spool/catalog/forecast write surface AND the SpoolBuddy kiosk endpoints
			
 
				+    # (NFC scan, scale reading, system command/update) which used
			
 
				+    # INVENTORY_UPDATE as a stand-in for "kiosk write" under the prior
			
 
				+    # denylist model. Read-only inventory (INVENTORY_READ etc.) stays under
			
 
				+    # can_read_status.
			
 
				+    Permission.INVENTORY_CREATE: "can_manage_inventory",
			
 
				+    Permission.INVENTORY_UPDATE: "can_manage_inventory",
			
 
				+    Permission.INVENTORY_DELETE: "can_manage_inventory",
			
 
				+    Permission.INVENTORY_FORECAST_WRITE: "can_manage_inventory",
			
 
				+    # can_access_cloud — narrow opt-in scope, gated by the router-level
			
 
				+    # ``_cloud_api_key_gate`` and additionally enforced here so the route-
			
 
				+    # level ``cloud_caller(Permission.CLOUD_AUTH)`` dep also fails closed
			
 
				+    # when the flag is off (defence-in-depth).
			
 
				+    Permission.CLOUD_AUTH: "can_access_cloud",
			
 
				+}
			
 
				+
			
 
				+# Retained for documentation, drift-detection, and the prior "administrative
			
 
				+# operations" error string. Entries here are also absent from
			
 
				+# ``_APIKEY_SCOPE_BY_PERMISSION``, so they fail closed via the allowlist; the
			
 
				+# denylist is a redundant explicit "these are admin" marker, not the load-
			
 
				+# bearing security check.
			
 
				 _APIKEY_DENIED_PERMISSIONS: frozenset[Permission] = frozenset(
			
 
				     {
			
 
				+        # Settings administration (cred storage; rewriting these reaches SMTP/LDAP/MQTT).
			
 
				         Permission.SETTINGS_UPDATE,
			
 
				         Permission.SETTINGS_BACKUP,
			
 
				         Permission.SETTINGS_RESTORE,
			
 
				+        # User / group / API-key administration.
			
 
				         Permission.USERS_READ,
			
 
				         Permission.USERS_CREATE,
			
 
				         Permission.USERS_UPDATE,
			
@@ -43,22 +150,112 @@ _APIKEY_DENIED_PERMISSIONS: frozenset[Permission] = frozenset(
 
				         Permission.API_KEYS_UPDATE,
			
 
				         Permission.API_KEYS_DELETE,
			
 
				         Permission.API_KEYS_READ,
			
 
				+        # GitHub backup admin + firmware OTA.
			
 
				         Permission.GITHUB_BACKUP,
			
 
				         Permission.GITHUB_RESTORE,
			
 
				         Permission.FIRMWARE_UPDATE,
			
 
				+        # Resource administration (printer/project/filament/maintenance/k-profile/etc CRUD).
			
 
				+        # API keys with the operational scopes can read these resources via
			
 
				+        # *_READ permissions but cannot mutate the catalog/registry itself.
			
 
				+        Permission.PRINTERS_CREATE,
			
 
				+        Permission.PRINTERS_UPDATE,
			
 
				+        Permission.PRINTERS_DELETE,
			
 
				+        Permission.ARCHIVES_CREATE,
			
 
				+        Permission.ARCHIVES_UPDATE_OWN,
			
 
				+        Permission.ARCHIVES_UPDATE_ALL,
			
 
				+        Permission.ARCHIVES_DELETE_OWN,
			
 
				+        Permission.ARCHIVES_DELETE_ALL,
			
 
				+        Permission.ARCHIVES_PURGE,
			
 
				+        Permission.LIBRARY_UPDATE_ALL,
			
 
				+        Permission.LIBRARY_DELETE_ALL,
			
 
				+        Permission.LIBRARY_PURGE,
			
 
				+        Permission.PROJECTS_CREATE,
			
 
				+        Permission.PROJECTS_UPDATE,
			
 
				+        Permission.PROJECTS_DELETE,
			
 
				+        Permission.FILAMENTS_CREATE,
			
 
				+        Permission.FILAMENTS_UPDATE,
			
 
				+        Permission.FILAMENTS_DELETE,
			
 
				+        Permission.MAINTENANCE_CREATE,
			
 
				+        Permission.MAINTENANCE_UPDATE,
			
 
				+        Permission.MAINTENANCE_DELETE,
			
 
				+        Permission.KPROFILES_CREATE,
			
 
				+        Permission.KPROFILES_UPDATE,
			
 
				+        Permission.KPROFILES_DELETE,
			
 
				+        Permission.NOTIFICATIONS_CREATE,
			
 
				+        Permission.NOTIFICATIONS_UPDATE,
			
 
				+        Permission.NOTIFICATIONS_DELETE,
			
 
				+        Permission.NOTIFICATIONS_USER_EMAIL,
			
 
				+        Permission.NOTIFICATION_TEMPLATES_UPDATE,
			
 
				+        Permission.EXTERNAL_LINKS_CREATE,
			
 
				+        Permission.EXTERNAL_LINKS_UPDATE,
			
 
				+        Permission.EXTERNAL_LINKS_DELETE,
			
 
				+        Permission.SMART_PLUGS_CREATE,
			
 
				+        Permission.SMART_PLUGS_UPDATE,
			
 
				+        Permission.SMART_PLUGS_DELETE,
			
 
				+        # Network scanning — operator only (no API-key scope for this).
			
 
				+        Permission.DISCOVERY_SCAN,
			
 
				     }
			
 
				 )
			
 
				 
			
 
				 
			
 
				-def _check_apikey_permissions(perm_strings: list[str]) -> None:
			
 
				-    """Raise 403 if any required permission is admin-only (not accessible via API key)."""
			
 
				-    denied = _APIKEY_DENIED_PERMISSIONS.intersection(perm_strings)
			
 
				-    if denied:
			
 
				+def _resolve_apikey_scope(perm_string: str) -> str | None:
			
 
				+    """Return the scope-flag attribute name gating ``perm_string`` for API keys.
			
 
				+
			
 
				+    None when the permission is unmapped (= admin-only / not API-key-usable).
			
 
				+    """
			
 
				+    try:
			
 
				+        perm = Permission(perm_string)
			
 
				+    except ValueError:
			
 
				+        return None
			
 
				+    return _APIKEY_SCOPE_BY_PERMISSION.get(perm)
			
 
				+
			
 
				+
			
 
				+def _check_apikey_permissions(api_key: APIKey, perm_strings: list[str], *, require_any: bool = False) -> None:
			
 
				+    """Raise 403 unless ``api_key`` is allowed to use ``perm_strings``.
			
 
				+
			
 
				+    Allowlist semantics: every requested permission MUST be present in
			
 
				+    ``_APIKEY_SCOPE_BY_PERMISSION`` AND its scope flag must be True on
			
 
				+    ``api_key``. Unmapped permissions = administrative = 403.
			
 
				+
			
 
				+    By default ALL requested permissions must pass (mirrors
			
 
				+    ``require_permission`` / ``require_permission_if_auth_enabled``).
			
 
				+    When ``require_any=True``, only one needs to pass (mirrors
			
 
				+    ``require_any_permission_if_auth_enabled``).
			
 
				+    """
			
 
				+    if not perm_strings:
			
 
				+        # Defensive: empty perm list means the dep is auth-only, not perm-gated.
			
 
				+        # Routes never call us with [] today, but if they did, returning here
			
 
				+        # would silently allow — instead, fail closed.
			
 
				         raise HTTPException(
			
 
				             status_code=status.HTTP_403_FORBIDDEN,
			
 
				-            detail="API keys cannot be used for administrative operations",
			
 
				+            detail="API keys cannot be used for unspecified permissions",
			
 
				         )
			
 
				 
			
 
				+    last_failure: HTTPException | None = None
			
 
				+    for perm_str in perm_strings:
			
 
				+        scope_attr = _resolve_apikey_scope(perm_str)
			
 
				+        if scope_attr is None:
			
 
				+            failure = HTTPException(
			
 
				+                status_code=status.HTTP_403_FORBIDDEN,
			
 
				+                detail="API keys cannot be used for administrative operations",
			
 
				+            )
			
 
				+        elif not getattr(api_key, scope_attr, False):
			
 
				+            failure = HTTPException(
			
 
				+                status_code=status.HTTP_403_FORBIDDEN,
			
 
				+                detail=f"API key does not have '{scope_attr}' permission",
			
 
				+            )
			
 
				+        else:
			
 
				+            failure = None
			
 
				+
			
 
				+        if failure is None and require_any:
			
 
				+            return  # at least one passed
			
 
				+        if failure is not None and not require_any:
			
 
				+            raise failure
			
 
				+        last_failure = failure
			
 
				+
			
 
				+    if require_any and last_failure is not None:
			
 
				+        raise last_failure
			
 
				+
			
 
				 
			
 
				 def require_energy_cost_update():
			
 
				     """Dependency for ``POST /settings/electricity-price`` (#1356).
			
@@ -307,6 +504,72 @@ async def create_camera_stream_token() -> str:
 
				     return token
			
 
				 
			
 
				 
			
 
				+WEBSOCKET_TOKEN_EXPIRE_MINUTES = 60
			
 
				+
			
 
				+
			
 
				+async def create_websocket_token(username: str | None) -> str:
			
 
				+    """Create a short-lived token for ``/api/v1/ws`` connections.
			
 
				+
			
 
				+    Mirrors the camera-stream-token pattern: opaque random string stored
			
 
				+    in ``auth_ephemeral_tokens`` with type ``"websocket"`` so the WS
			
 
				+    endpoint can verify it *before* calling ``websocket.accept()``.
			
 
				+
			
 
				+    Records the issuing principal in the ``username`` field — for JWT
			
 
				+    callers this is the actual username, for API-keyed callers this is
			
 
				+    the empty string (handled in the route layer; we accept None at this
			
 
				+    interface so the auth-disabled path doesn't have to fabricate one).
			
 
				+
			
 
				+    The 60-minute expiry matches camera tokens: long enough to survive
			
 
				+    page reloads / brief disconnects, short enough that a leaked token
			
 
				+    is not a credential.
			
 
				+    """
			
 
				+    now = datetime.now(timezone.utc)
			
 
				+    expires_at = now + timedelta(minutes=WEBSOCKET_TOKEN_EXPIRE_MINUTES)
			
 
				+    token = secrets.token_urlsafe(24)
			
 
				+    async with async_session() as db:
			
 
				+        # Prune expired tokens opportunistically (same shape as camera).
			
 
				+        await db.execute(
			
 
				+            delete(AuthEphemeralToken).where(
			
 
				+                AuthEphemeralToken.token_type == "websocket",
			
 
				+                AuthEphemeralToken.expires_at < now,
			
 
				+            )
			
 
				+        )
			
 
				+        db.add(
			
 
				+            AuthEphemeralToken(
			
 
				+                token=token,
			
 
				+                token_type="websocket",
			
 
				+                username=username or "",
			
 
				+                expires_at=expires_at,
			
 
				+            )
			
 
				+        )
			
 
				+        await db.commit()
			
 
				+    return token
			
 
				+
			
 
				+
			
 
				+async def verify_websocket_token(token: str) -> str | None:
			
 
				+    """Verify a WebSocket connect token.
			
 
				+
			
 
				+    Returns the recorded ``username`` (possibly ``""`` for API-key
			
 
				+    callers, never ``None`` on success) when the token is valid, or
			
 
				+    ``None`` when it is missing / expired / unknown. The token is
			
 
				+    NOT consumed — a single page reload should not need a new round
			
 
				+    trip to mint a replacement.
			
 
				+    """
			
 
				+    now = datetime.now(timezone.utc)
			
 
				+    async with async_session() as db:
			
 
				+        result = await db.execute(
			
 
				+            select(AuthEphemeralToken).where(
			
 
				+                AuthEphemeralToken.token == token,
			
 
				+                AuthEphemeralToken.token_type == "websocket",
			
 
				+                AuthEphemeralToken.expires_at > now,
			
 
				+            )
			
 
				+        )
			
 
				+        row = result.scalar_one_or_none()
			
 
				+        if row is None:
			
 
				+            return None
			
 
				+        return row.username or ""
			
 
				+
			
 
				+
			
 
				 async def verify_camera_stream_token(token: str) -> bool:
			
 
				     """Verify a camera stream token is valid (reusable — does not consume it).
			
 
				 
			
@@ -551,7 +814,7 @@ async def _validate_api_key(db: AsyncSession, api_key_value: str) -> APIKey | No
 
				                 api_key.last_used = datetime.now(timezone.utc)
			
 
				                 await db.commit()
			
 
				                 return api_key
			
 
				-    except Exception as e:
			
 
				+    except Exception as e:  # SEC-AUTH-EXC: validation failure returns None; every caller treats None as "invalid key" → 401 (fail-closed)
			
 
				         logger.warning("API key validation error: %s", e)
			
 
				     return None
			
 
				 
			
@@ -742,19 +1005,92 @@ def require_role(required_role: str):
 
				 
			
 
				 
			
 
				 def require_admin_if_auth_enabled():
			
 
				-    """Dependency factory that requires admin role if auth is enabled."""
			
 
				+    """Dependency factory that requires admin role if auth is enabled.
			
 
				+
			
 
				+    GHSA-r2qv follow-up (audit pattern P3): explicitly fail-closed for API
			
 
				+    keys. The previous implementation chained on ``require_auth_if_enabled``
			
 
				+    which returns ``None`` for *both* "auth disabled" *and* "valid API
			
 
				+    key" — the inner ``admin_checker`` then treated ``None`` as auth-
			
 
				+    disabled and admitted the caller. If any route had ever adopted this
			
 
				+    dep, any API key with no scope flags set would have satisfied an
			
 
				+    admin requirement.
			
 
				+
			
 
				+    Today no route uses this dep, but rather than leave the footgun
			
 
				+    armed, the dep is rewritten to distinguish the two cases by
			
 
				+    consulting ``is_auth_enabled`` directly and rejecting API-keyed
			
 
				+    requests with 403. "Admin" requires a user-identity role, which API
			
 
				+    keys do not carry.
			
 
				+    """
			
 
				 
			
 
				     async def admin_checker(
			
 
				-        current_user: Annotated[User | None, Depends(require_auth_if_enabled)] = None,
			
 
				+        credentials: Annotated[HTTPAuthorizationCredentials | None, Depends(security)] = None,
			
 
				+        x_api_key: Annotated[str | None, Header(alias="X-API-Key")] = None,
			
 
				     ) -> User | None:
			
 
				-        if current_user is None:
			
 
				-            return None  # Auth not enabled, allow access
			
 
				-        if current_user.role != "admin":
			
 
				-            raise HTTPException(
			
 
				-                status_code=status.HTTP_403_FORBIDDEN,
			
 
				-                detail="Requires admin role",
			
 
				-            )
			
 
				-        return current_user
			
 
				+        async with async_session() as db:
			
 
				+            if not await is_auth_enabled(db):
			
 
				+                return None  # Auth disabled — no role to check.
			
 
				+
			
 
				+            # Reject API-keyed requests up front: admin is a user-role
			
 
				+            # concept, not a key-scope concept. The right path for
			
 
				+            # admin-equivalent API-key access is a specific Permission
			
 
				+            # (e.g. SETTINGS_UPDATE) gated by the allowlist, not the
			
 
				+            # admin role.
			
 
				+            if x_api_key or (credentials and credentials.credentials.startswith("bb_")):
			
 
				+                raise HTTPException(
			
 
				+                    status_code=status.HTTP_403_FORBIDDEN,
			
 
				+                    detail="Admin operations require a user role; API keys cannot be admins",
			
 
				+                )
			
 
				+
			
 
				+            # Standard JWT path: validate and require admin role.
			
 
				+            if credentials is None:
			
 
				+                raise HTTPException(
			
 
				+                    status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				+                    detail="Authentication required",
			
 
				+                    headers={"WWW-Authenticate": "Bearer"},
			
 
				+                )
			
 
				+            try:
			
 
				+                payload = jwt.decode(credentials.credentials, SECRET_KEY, algorithms=[ALGORITHM])
			
 
				+                username: str = payload.get("sub")
			
 
				+                if username is None:
			
 
				+                    raise HTTPException(
			
 
				+                        status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				+                        detail="Could not validate credentials",
			
 
				+                        headers={"WWW-Authenticate": "Bearer"},
			
 
				+                    )
			
 
				+                jti: str | None = payload.get("jti")
			
 
				+                if not jti or await is_jti_revoked(jti):
			
 
				+                    raise HTTPException(
			
 
				+                        status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				+                        detail="Could not validate credentials",
			
 
				+                        headers={"WWW-Authenticate": "Bearer"},
			
 
				+                    )
			
 
				+                iat: int | float | None = payload.get("iat")
			
 
				+            except JWTError:
			
 
				+                raise HTTPException(
			
 
				+                    status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				+                    detail="Could not validate credentials",
			
 
				+                    headers={"WWW-Authenticate": "Bearer"},
			
 
				+                )
			
 
				+
			
 
				+            user = await get_user_by_username(db, username)
			
 
				+            if user is None or not user.is_active:
			
 
				+                raise HTTPException(
			
 
				+                    status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				+                    detail="Could not validate credentials",
			
 
				+                    headers={"WWW-Authenticate": "Bearer"},
			
 
				+                )
			
 
				+            if not _is_token_fresh(iat, user):
			
 
				+                raise HTTPException(
			
 
				+                    status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				+                    detail="Could not validate credentials",
			
 
				+                    headers={"WWW-Authenticate": "Bearer"},
			
 
				+                )
			
 
				+            if user.role != "admin":
			
 
				+                raise HTTPException(
			
 
				+                    status_code=status.HTTP_403_FORBIDDEN,
			
 
				+                    detail="Requires admin role",
			
 
				+                )
			
 
				+            return user
			
 
				 
			
 
				     return admin_checker
			
 
				 
			
@@ -930,7 +1266,7 @@ def require_permission(*permissions: str | Permission):
 
				             if x_api_key:
			
 
				                 api_key = await _validate_api_key(db, x_api_key)
			
 
				                 if api_key:
			
 
				-                    _check_apikey_permissions(perm_strings)
			
 
				+                    _check_apikey_permissions(api_key, perm_strings)
			
 
				                     return None  # API key valid, allow access
			
 
				 
			
 
				             credentials_exception = HTTPException(
			
@@ -947,7 +1283,7 @@ def require_permission(*permissions: str | Permission):
 
				             if token.startswith("bb_"):
			
 
				                 api_key = await _validate_api_key(db, token)
			
 
				                 if api_key:
			
 
				-                    _check_apikey_permissions(perm_strings)
			
 
				+                    _check_apikey_permissions(api_key, perm_strings)
			
 
				                     return None  # API key valid, allow access
			
 
				                 raise HTTPException(
			
 
				                     status_code=status.HTTP_401_UNAUTHORIZED,
			
@@ -1020,7 +1356,7 @@ def require_permission_if_auth_enabled(*permissions: str | Permission):
 
				             if x_api_key:
			
 
				                 api_key = await _validate_api_key(db, x_api_key)
			
 
				                 if api_key:
			
 
				-                    _check_apikey_permissions(perm_strings)
			
 
				+                    _check_apikey_permissions(api_key, perm_strings)
			
 
				                     return None  # API key valid, allow access
			
 
				 
			
 
				             # Check for Bearer token (could be JWT or API key)
			
@@ -1030,7 +1366,7 @@ def require_permission_if_auth_enabled(*permissions: str | Permission):
 
				                 if token.startswith("bb_"):
			
 
				                     api_key = await _validate_api_key(db, token)
			
 
				                     if api_key:
			
 
				-                        _check_apikey_permissions(perm_strings)
			
 
				+                        _check_apikey_permissions(api_key, perm_strings)
			
 
				                         return None  # API key valid, allow access
			
 
				                     raise HTTPException(
			
 
				                         status_code=status.HTTP_401_UNAUTHORIZED,
			
@@ -1120,6 +1456,10 @@ def require_any_permission_if_auth_enabled(*permissions: str | Permission):
 
				             if x_api_key:
			
 
				                 api_key = await _validate_api_key(db, x_api_key)
			
 
				                 if api_key:
			
 
				+                    # GHSA-r2qv-8222-hqg3: previously returned None unconditionally,
			
 
				+                    # letting any valid API key satisfy admin "any-of" route
			
 
				+                    # dependencies. require_any → at-least-one must pass the scope check.
			
 
				+                    _check_apikey_permissions(api_key, perm_strings, require_any=True)
			
 
				                     return None
			
 
				 
			
 
				             if credentials is not None:
			
@@ -1127,6 +1467,7 @@ def require_any_permission_if_auth_enabled(*permissions: str | Permission):
 
				                 if token.startswith("bb_"):
			
 
				                     api_key = await _validate_api_key(db, token)
			
 
				                     if api_key:
			
 
				+                        _check_apikey_permissions(api_key, perm_strings, require_any=True)
			
 
				                         return None
			
 
				                     raise HTTPException(
			
 
				                         status_code=status.HTTP_401_UNAUTHORIZED,
			
@@ -1223,10 +1564,17 @@ def require_ownership_permission(
 
				 ):
			
 
				     """Dependency factory for ownership-based permission checks.
			
 
				 
			
 
				-    - User with `all_permission` can modify any item
			
 
				-    - User with `own_permission` can only modify items where created_by_id == user.id
			
 
				-    - Ownerless items (created_by_id = null) require `all_permission`
			
 
				-    - API keys (via X-API-Key header or Bearer bb_xxx) get full access (can_modify_all=True)
			
 
				+    - User with ``all_permission`` can modify any item
			
 
				+    - User with ``own_permission`` can only modify items where created_by_id == user.id
			
 
				+    - Ownerless items (created_by_id = null) require ``all_permission``
			
 
				+    - API keys (via X-API-Key header or Bearer bb_xxx) must satisfy the
			
 
				+      ``all_permission``'s API-key scope flag (e.g. ``can_queue`` for
			
 
				+      ``QUEUE_UPDATE_ALL``) and then receive ``can_modify_all=True``.
			
 
				+      OWN/ALL ownership pairs map to the same scope flag in
			
 
				+      ``_APIKEY_SCOPE_BY_PERMISSION`` so checking ``all_permission`` is the
			
 
				+      correct gate; API keys have no per-row ownership identity. Pre-
			
 
				+      GHSA-r2qv-8222-hqg3 fix this returned ``(None, True)`` for any valid
			
 
				+      key with no scope check — see ``core/auth.py`` allowlist commentary.
			
 
				 
			
 
				     Returns:
			
 
				         A dependency function that returns (user, can_modify_all).
			
@@ -1250,11 +1598,20 @@ def require_ownership_permission(
 
				             if not auth_enabled:
			
 
				                 return None, True  # Auth disabled, allow all
			
 
				 
			
 
				-            # Check for API key first (X-API-Key header)
			
 
				+            # GHSA-r2qv-8222-hqg3: previously API keys received (None, True)
			
 
				+            # unconditionally on ownership-modify routes — a "queue-only" key
			
 
				+            # could delete any user's archives, library files, queue items.
			
 
				+            # OWN and ALL ownership perms both map to the same scope flag
			
 
				+            # (e.g. both QUEUE_UPDATE_OWN and QUEUE_UPDATE_ALL → can_queue),
			
 
				+            # so checking ``all_perm`` against the api_key's scope is the
			
 
				+            # correct gate. API keys don't have per-row ownership identity, so
			
 
				+            # on pass we keep can_modify_all=True (preserves prior intent,
			
 
				+            # narrows access to keys with the right scope flag).
			
 
				             if x_api_key:
			
 
				                 api_key = await _validate_api_key(db, x_api_key)
			
 
				                 if api_key:
			
 
				-                    return None, True  # API key valid, allow all
			
 
				+                    _check_apikey_permissions(api_key, [all_perm])
			
 
				+                    return None, True
			
 
				 
			
 
				             # Check for Bearer token (could be JWT or API key)
			
 
				             if credentials is not None:
			
@@ -1263,7 +1620,8 @@ def require_ownership_permission(
 
				                 if token.startswith("bb_"):
			
 
				                     api_key = await _validate_api_key(db, token)
			
 
				                     if api_key:
			
 
				-                        return None, True  # API key valid, allow all
			
 
				+                        _check_apikey_permissions(api_key, [all_perm])
			
 
				+                        return None, True
			
 
				                     raise HTTPException(
			
 
				                         status_code=status.HTTP_401_UNAUTHORIZED,
			
 
				                         detail="Invalid API key",
			
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -6,7 +6,7 @@ from pathlib import Path
 
				 from pydantic_settings import BaseSettings
			
 
				 
			
 
				 # Application version - single source of truth
			
 
				-APP_VERSION = "0.2.4.4"
			
 
				+APP_VERSION = "0.2.4.5"
			
 
				 GITHUB_REPO = "maziggy/bambuddy"
			
 
				 BUG_REPORT_RELAY_URL = os.environ.get("BUG_REPORT_RELAY_URL", "https://bambuddy.cool/api/bug-report")
			
 
				 
			
--- a/backend/app/core/database.py
+++ b/backend/app/core/database.py
@@ -405,6 +405,26 @@ async def _safe_execute(conn, sql):
 
				             raise
			
 
				 
			
 
				 
			
 
				+async def _api_keys_column_exists(conn, column_name: str) -> bool:
			
 
				+    """Return True if the named column exists on ``api_keys``.
			
 
				+
			
 
				+    Used to gate one-shot data backfills that must run only on the migration
			
 
				+    that adds a column — without this, repeating the UPDATE on every startup
			
 
				+    would silently overwrite values the user later edited in the UI.
			
 
				+    Dialect-specific because SQLite has no information_schema.
			
 
				+    """
			
 
				+    from sqlalchemy import text
			
 
				+
			
 
				+    if is_sqlite():
			
 
				+        result = await conn.execute(text("PRAGMA table_info(api_keys)"))
			
 
				+        return any(row[1] == column_name for row in result)
			
 
				+    result = await conn.execute(
			
 
				+        text("SELECT 1 FROM information_schema.columns WHERE table_name = 'api_keys' AND column_name = :col"),
			
 
				+        {"col": column_name},
			
 
				+    )
			
 
				+    return result.scalar_one_or_none() is not None
			
 
				+
			
 
				+
			
 
				 async def _migrate_normalize_printer_ids(conn) -> None:
			
 
				     from sqlalchemy import text
			
 
				 
			
@@ -1639,9 +1659,18 @@ async def run_migrations(conn):
 
				 
			
 
				                     result = await conn.execute(text("SELECT value FROM settings WHERE key = 'virtual_printer_mode'"))
			
 
				                     row = result.fetchone()
			
 
				-                    old_mode = row[0] if row else "immediate"
			
 
				+                    old_mode = row[0] if row else "archive"
			
 
				+                    # Translate to canonical wire values (#1429 mode-label
			
 
				+                    # discrepancy): legacy `immediate` → `archive`, legacy
			
 
				+                    # `print_queue` → `queue`. The historical `queue` alias
			
 
				+                    # for `review` predates the canonical rename and is
			
 
				+                    # preserved (existing user intent was "pending review").
			
 
				                     if old_mode == "queue":
			
 
				                         old_mode = "review"
			
 
				+                    elif old_mode == "immediate":
			
 
				+                        old_mode = "archive"
			
 
				+                    elif old_mode == "print_queue":
			
 
				+                        old_mode = "queue"
			
 
				 
			
 
				                     result = await conn.execute(text("SELECT value FROM settings WHERE key = 'virtual_printer_model'"))
			
 
				                     row = result.fetchone()
			
@@ -1671,7 +1700,7 @@ async def run_migrations(conn):
 
				                         {
			
 
				                             "name": "Bambuddy",
			
 
				                             "enabled": old_enabled,
			
 
				-                            "mode": old_mode or "immediate",
			
 
				+                            "mode": old_mode or "archive",
			
 
				                             "model": old_model,
			
 
				                             "access_code": old_access_code,
			
 
				                             "target_id": old_target_id,
			
@@ -1786,6 +1815,41 @@ async def run_migrations(conn):
 
				             {"old": old_val, "new": new_val},
			
 
				         )
			
 
				 
			
 
				+    # Migration: Rename VP mode wire values to match the user-facing labels
			
 
				+    # (#1429 follow-up). The UI button "Archive" had always saved `immediate`
			
 
				+    # and "Queue" had always saved `print_queue` — a mismatch that showed up
			
 
				+    # confusingly in every support bundle. The button labels stay; the wire
			
 
				+    # value is what changes. Idempotent: re-running the UPDATE on canonical
			
 
				+    # values is a no-op. SQLite and Postgres both accept this statement
			
 
				+    # unchanged (string literal comparison, no driver-specific syntax).
			
 
				+    vp_mode_renames = [("immediate", "archive"), ("print_queue", "queue")]
			
 
				+    for old_val, new_val in vp_mode_renames:
			
 
				+        await conn.execute(
			
 
				+            text("UPDATE virtual_printers SET mode = :new WHERE mode = :old"),
			
 
				+            {"old": old_val, "new": new_val},
			
 
				+        )
			
 
				+        await conn.execute(
			
 
				+            text("UPDATE settings SET value = :new WHERE key = 'virtual_printer_mode' AND value = :old"),
			
 
				+            {"old": old_val, "new": new_val},
			
 
				+        )
			
 
				+
			
 
				+    # Migration: Unify `LibraryFile.file_type` across ingest paths (#1600).
			
 
				+    # Pre-#1600, only the external-folder scan path stored `gcode.3mf` for
			
 
				+    # sliced outputs — the upload, ZIP-extract, and in-process paths all
			
 
				+    # stripped to the trailing `.3mf` and stored `3mf`, so the same file
			
 
				+    # family was split between two values depending on how it was ingested.
			
 
				+    # Going forward `classify_file_type()` is canonical; this backfill flips
			
 
				+    # existing legacy `3mf` rows whose filename ends in `.gcode.3mf` to the
			
 
				+    # canonical compound name. Idempotent (post-update rows no longer match
			
 
				+    # `file_type = '3mf'`) and dialect-neutral (`LOWER` + `LIKE` work the
			
 
				+    # same under SQLite and Postgres).
			
 
				+    await conn.execute(
			
 
				+        text(
			
 
				+            "UPDATE library_files SET file_type = 'gcode.3mf' "
			
 
				+            "WHERE file_type = '3mf' AND LOWER(filename) LIKE '%.gcode.3mf'"
			
 
				+        )
			
 
				+    )
			
 
				+
			
 
				     # Migration: Add per-user Bambu Cloud credential columns
			
 
				     await _safe_execute(conn, "ALTER TABLE users ADD COLUMN cloud_token VARCHAR(500)")
			
 
				     await _safe_execute(conn, "ALTER TABLE users ADD COLUMN cloud_email VARCHAR(255)")
			
@@ -2186,6 +2250,40 @@ async def run_migrations(conn):
 
				         "ALTER TABLE api_keys ADD COLUMN can_update_energy_cost BOOLEAN DEFAULT FALSE",
			
 
				     )
			
 
				 
			
 
				+    # GHSA-r2qv-8222-hqg3 (CVE-2026-pending, CVSS 9.9): split file-management out
			
 
				+    # of the implicit "any API key" grant into an explicit scope flag. The
			
 
				+    # allowlist-based ``_check_apikey_permissions`` (see ``core/auth.py``) routes
			
 
				+    # LIBRARY_UPLOAD / LIBRARY_UPDATE_OWN / LIBRARY_DELETE_OWN / MAKERWORLD_IMPORT
			
 
				+    # through this flag. DEFAULT TRUE matches the existing "queue + read" trust
			
 
				+    # baseline; backfill mirrors can_queue so a key the user previously created as
			
 
				+    # "queue-only" retains the file-upload step its queue workflow already used,
			
 
				+    # while a hardened "read-only" key (can_queue=False) does not silently gain a
			
 
				+    # new write capability on upgrade. Backfill is gated on column non-existence
			
 
				+    # so user-edited values are never overwritten on subsequent startup.
			
 
				+    column_existed = await _api_keys_column_exists(conn, "can_manage_library")
			
 
				+    await _safe_execute(
			
 
				+        conn,
			
 
				+        "ALTER TABLE api_keys ADD COLUMN can_manage_library BOOLEAN DEFAULT TRUE",
			
 
				+    )
			
 
				+    if not column_existed:
			
 
				+        async with conn.begin_nested():
			
 
				+            await conn.execute(text("UPDATE api_keys SET can_manage_library = can_queue"))
			
 
				+
			
 
				+    # Same shape: SpoolBuddy NFC/scale/system endpoints plus manual inventory
			
 
				+    # writes split out of the implicit "any API key" grant. Backfill mirrors
			
 
				+    # ``can_queue`` so the bundled SpoolBuddy kiosk key (created via the CLI
			
 
				+    # with can_queue=False) does NOT silently gain inventory writes — but
			
 
				+    # the CLI override sets the new flag True explicitly, since the kiosk
			
 
				+    # itself is the legitimate writer (see ``cli.py``).
			
 
				+    column_existed = await _api_keys_column_exists(conn, "can_manage_inventory")
			
 
				+    await _safe_execute(
			
 
				+        conn,
			
 
				+        "ALTER TABLE api_keys ADD COLUMN can_manage_inventory BOOLEAN DEFAULT TRUE",
			
 
				+    )
			
 
				+    if not column_existed:
			
 
				+        async with conn.begin_nested():
			
 
				+            await conn.execute(text("UPDATE api_keys SET can_manage_inventory = can_queue"))
			
 
				+
			
 
				     # Migration: Soft-delete column for trash bin (Issue #1008). Indexed so the
			
 
				     # sweeper's "SELECT ... WHERE deleted_at < cutoff" and the trash list's
			
 
				     # "WHERE deleted_at IS NOT NULL" stay cheap as the table grows.
			
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -330,6 +330,14 @@ logging.info("Bambuddy starting - debug=%s, log_level=%s", app_settings.debug, l
 
				 # Track active prints: {(printer_id, filename): archive_id}
			
 
				 _active_prints: dict[tuple[int, str], int] = {}
			
 
				 
			
 
				+# Per-printer "connected" edge tracker. Used by `on_printer_status_change`
			
 
				+# to fire `reconcile_stale_active_prints` exactly once per (re)connection
			
 
				+# (#1542 follow-up — power-cycle ghost prints). The value is True after
			
 
				+# the first connected status update for that connection; transitions back
			
 
				+# to False whenever we observe `state.connected = False` so the next
			
 
				+# reconnect re-arms reconciliation. Keyed by printer_id.
			
 
				+_printer_reconciled_since_connect: dict[int, bool] = {}
			
 
				+
			
 
				 # Track expected prints from reprint/scheduled (skip auto-archiving for these)
			
 
				 # {(printer_id, filename): archive_id}
			
 
				 _expected_prints: dict[tuple[int, str], int] = {}
			
@@ -628,6 +636,89 @@ def _get_start_ams_mapping(data: dict, archive_id: int | None) -> list[int] | No
 
				     return stored_ams_mapping
			
 
				 
			
 
				 
			
 
				+def _extract_filament_data_from_mqtt(data: dict, ams_mapping: list[int] | None = None) -> dict[str, str]:
			
 
				+    """Best-effort filament metadata from the MQTT print-start snapshot.
			
 
				+
			
 
				+    Used when the 3MF can't be downloaded (P1S/A1/P2S firmwares lock the
			
 
				+    file during print, see #1533) so the fallback PrintArchive still has
			
 
				+    enough filament info to support the inventory views and AMS-expansion
			
 
				+    planning the operator opens it for. Returns a dict with optional
			
 
				+    ``filament_type`` and ``filament_color`` keys in the same
			
 
				+    comma-separated format the 3MF extractor produces, so the rest of the
			
 
				+    codebase treats the fallback archive identically to a normal one.
			
 
				+
			
 
				+    ``ams_mapping`` is the slicer's slot-per-print-filament list captured
			
 
				+    from the MQTT print payload (global tray IDs, possibly -1 for VT-tray
			
 
				+    entries). When supplied, only the slots actually consumed by this
			
 
				+    print contribute. Without it the function falls back to every loaded
			
 
				+    AMS slot — less accurate but still useful.
			
 
				+
			
 
				+    Accepts both the raw inner payload (``{"ams": {"ams": [...]}, ...}``)
			
 
				+    that the unit tests pass directly, AND the on_print_start callback
			
 
				+    shape (``{"raw_data": {"ams": {"ams": [...]}, ...}, ...}``) the
			
 
				+    bambu_mqtt service hands to main.py at runtime. The original
			
 
				+    ``_extract_filament_data_from_mqtt(data)`` shipped in #1533 only
			
 
				+    handled the inner shape and silently returned ``{}`` for every real
			
 
				+    print start, leaving fallback archives' filament fields NULL — the
			
 
				+    exact regression the fix was meant to close. Reported with a log
			
 
				+    proving the AMS state was right there at
			
 
				+    ``data["raw_data"]["ams"]["ams"][0]["tray"][0]`` (#1533 follow-up).
			
 
				+    """
			
 
				+    result: dict[str, str] = {}
			
 
				+    # Look at the on_print_start wrapper first, then the inner shape.
			
 
				+    raw_data = (data or {}).get("raw_data")
			
 
				+    ams_root = (raw_data or {}).get("ams") if isinstance(raw_data, dict) else None
			
 
				+    if not isinstance(ams_root, dict):
			
 
				+        ams_root = (data or {}).get("ams") or {}
			
 
				+    ams_units = ams_root.get("ams") if isinstance(ams_root, dict) else None
			
 
				+    if not isinstance(ams_units, list) or not ams_units:
			
 
				+        return result
			
 
				+
			
 
				+    # Map global tray id (unit * 4 + tray) → (type, color).
			
 
				+    loaded: dict[int, tuple[str, str]] = {}
			
 
				+    for unit in ams_units:
			
 
				+        if not isinstance(unit, dict):
			
 
				+            continue
			
 
				+        try:
			
 
				+            unit_id = int(unit.get("id", 0))
			
 
				+        except (TypeError, ValueError):
			
 
				+            continue
			
 
				+        for tray in unit.get("tray") or []:
			
 
				+            if not isinstance(tray, dict):
			
 
				+                continue
			
 
				+            try:
			
 
				+                tray_id = int(tray.get("id", 0))
			
 
				+            except (TypeError, ValueError):
			
 
				+                continue
			
 
				+            ttype = (tray.get("tray_type") or "").strip()
			
 
				+            tcolor = (tray.get("tray_color") or "").strip().upper()
			
 
				+            if not ttype:
			
 
				+                continue  # Empty / unloaded slot.
			
 
				+            loaded[unit_id * 4 + tray_id] = (ttype, tcolor)
			
 
				+
			
 
				+    if not loaded:
			
 
				+        return result
			
 
				+
			
 
				+    if ams_mapping:
			
 
				+        used_ids = [int(x) for x in ams_mapping if isinstance(x, (int, float)) and int(x) >= 0]
			
 
				+        filaments = [loaded[g] for g in used_ids if g in loaded]
			
 
				+        if not filaments:
			
 
				+            return result  # Mapping points entirely at slots we have no data for.
			
 
				+    else:
			
 
				+        filaments = [loaded[g] for g in sorted(loaded.keys())]
			
 
				+
			
 
				+    types_joined = ",".join(f[0] for f in filaments)
			
 
				+    colors_joined = ",".join(f[1] for f in filaments if f[1])
			
 
				+
			
 
				+    # Column limits per backend/app/models/archive.py: filament_type=50,
			
 
				+    # filament_color=200.
			
 
				+    if types_joined:
			
 
				+        result["filament_type"] = types_joined[:50]
			
 
				+    if colors_joined:
			
 
				+        result["filament_color"] = colors_joined[:200]
			
 
				+    return result
			
 
				+
			
 
				+
			
 
				 def _maybe_start_layer_timelapse(printer, printer_id: int, archive_id: int) -> bool:
			
 
				     """Start a layer-timelapse session for *archive_id* when the printer has
			
 
				     an external camera configured. Returns True if a session was started.
			
@@ -715,6 +806,26 @@ _nozzle_count_updated: set[int] = set()
 
				 
			
 
				 async def on_printer_status_change(printer_id: int, state: PrinterState):
			
 
				     """Handle printer status changes - broadcast via WebSocket."""
			
 
				+    # Connected-edge reconciliation (#1542 follow-up). When the printer
			
 
				+    # transitions disconnected → connected — which covers both Bambuddy
			
 
				+    # startup (no prior connection) and a mid-session MQTT reconnect — fire
			
 
				+    # `reconcile_stale_active_prints` exactly once for this connection so
			
 
				+    # any archive still in `status="printing"` that can't actually be
			
 
				+    # running anymore (printer IDLE / different subtask / empty subtask)
			
 
				+    # gets a synthesised PRINT COMPLETE. Without this, a print that
			
 
				+    # finished during a disconnect window + a smart-plug power cycle
			
 
				+    # leaves the .3mf on the SD card and the firmware ghost-replays it on
			
 
				+    # next boot. Reconciliation runs concurrently — it must not block the
			
 
				+    # WebSocket dedup / broadcast logic below, and the connected edge is
			
 
				+    # marked True BEFORE the await so concurrent status updates inside
			
 
				+    # the same connection don't re-trigger reconciliation.
			
 
				+    if state.connected and not _printer_reconciled_since_connect.get(printer_id, False):
			
 
				+        _printer_reconciled_since_connect[printer_id] = True
			
 
				+        asyncio.create_task(reconcile_stale_active_prints(printer_id))
			
 
				+    elif not state.connected and _printer_reconciled_since_connect.get(printer_id, False):
			
 
				+        # Re-arm so the next reconnect triggers reconciliation again.
			
 
				+        _printer_reconciled_since_connect[printer_id] = False
			
 
				+
			
 
				     # Only broadcast if something meaningful changed (reduce WebSocket spam)
			
 
				     # Include rounded temperatures to detect meaningful temp changes (within 1 degree)
			
 
				     temps = state.temperatures or {}
			
@@ -2592,6 +2703,14 @@ async def on_print_start(printer_id: int, data: dict):
 
				                     if mc_remaining and isinstance(mc_remaining, (int, float)) and mc_remaining > 0:
			
 
				                         fallback_print_time = int(mc_remaining * 60)
			
 
				 
			
 
				+                # Best-effort filament metadata from MQTT — see
			
 
				+                # _extract_filament_data_from_mqtt. Without this the fallback
			
 
				+                # archive's filament fields stayed NULL even though the AMS
			
 
				+                # state at print start was sitting right there in `data`.
			
 
				+                # The slicer's ams_mapping (when present) narrows the result
			
 
				+                # to slots actually used by the print (#1533).
			
 
				+                mqtt_filament_meta = _extract_filament_data_from_mqtt(data, _get_start_ams_mapping(data, None))
			
 
				+
			
 
				                 # Create minimal archive entry
			
 
				                 fallback_archive = PrintArchive(
			
 
				                     printer_id=printer_id,
			
@@ -2603,6 +2722,8 @@ async def on_print_start(printer_id: int, data: dict):
 
				                     status="printing",
			
 
				                     started_at=datetime.now(timezone.utc),
			
 
				                     subtask_id=subtask_id,
			
 
				+                    filament_type=mqtt_filament_meta.get("filament_type"),
			
 
				+                    filament_color=mqtt_filament_meta.get("filament_color"),
			
 
				                     extra_data={"no_3mf_available": True, "original_subtask": subtask_name, "_print_data": data},
			
 
				                 )
			
 
				 
			
@@ -3070,6 +3191,136 @@ async def on_print_running_observed(printer_id: int, data: dict):
 
				     await _capture_timelapse_baseline_at_start(printer, printer_id, logger)
			
 
				 
			
 
				 
			
 
				+def _is_active_archive_stale(archive, state) -> tuple[bool, str]:
			
 
				+    """Return ``(is_stale, reason)`` for an archive in ``status="printing"``
			
 
				+    against the printer's current MQTT state.
			
 
				+
			
 
				+    Reconciliation triggers (#1542 follow-up — recovers from missed PRINT
			
 
				+    COMPLETE events, typically a print finishing during an MQTT disconnect
			
 
				+    window followed by a smart-plug power cycle):
			
 
				+
			
 
				+      1. Printer state is terminal (IDLE / FINISH / FAILED). The print is
			
 
				+         provably not running anymore — only branch that should fire under
			
 
				+         normal disconnect-then-reconnect timing.
			
 
				+      2. Printer has a different ``subtask_id`` than the archive. Bambu
			
 
				+         firmware mints a fresh ``subtask_id`` for each print, including the
			
 
				+         ghost replay it runs after a power cycle from a leftover SD file —
			
 
				+         so a mismatch unambiguously means the in-DB archive is no longer
			
 
				+         the print on the printer.
			
 
				+      3. Printer is running but ``subtask_name`` is empty. The printer
			
 
				+         doesn't know what it's running; the archive's reference to it is
			
 
				+         already broken.
			
 
				+
			
 
				+    Conservative on purpose: PAUSE / PREPARE / SLICING and any RUNNING state
			
 
				+    with matching subtask_id+subtask_name is left alone. The cost of a false
			
 
				+    positive is a single misreported "aborted" status that the next real
			
 
				+    PRINT COMPLETE would have overwritten with the correct status anyway.
			
 
				+    The cost of a false negative is the ghost-print loop in #1542.
			
 
				+    """
			
 
				+    current_state = (state.state or "").upper()
			
 
				+    if current_state in ("IDLE", "FINISH", "FAILED"):
			
 
				+        return True, f"printer state {current_state}"
			
 
				+    # Below here the printer is in a running / pre-running state (RUNNING /
			
 
				+    # PAUSE / PREPARE / SLICING / etc.) — decide based on subtask identity.
			
 
				+    current_subtask_id = (state.subtask_id or "").strip()
			
 
				+    if archive.subtask_id and current_subtask_id and archive.subtask_id != current_subtask_id:
			
 
				+        return True, f"subtask_id changed ({archive.subtask_id!r} → {current_subtask_id!r})"
			
 
				+    current_subtask_name = (state.subtask_name or "").strip()
			
 
				+    if not current_subtask_name:
			
 
				+        return True, "printer subtask_name empty"
			
 
				+    return False, ""
			
 
				+
			
 
				+
			
 
				+async def reconcile_stale_active_prints(printer_id: int) -> int:
			
 
				+    """Synthesise ``on_print_complete`` for archives whose print can't be
			
 
				+    running on the printer anymore.
			
 
				+
			
 
				+    Called once per MQTT (re)connection (from on_printer_status_change when
			
 
				+    the connected edge flips False → True) and at Bambuddy startup (from
			
 
				+    the FastAPI lifespan). Without this, a print that completes during a
			
 
				+    disconnect window — followed by a smart-plug-driven power cycle — leaves
			
 
				+    the ``.3mf`` on the SD card, the firmware auto-replays it on next boot,
			
 
				+    and Bambuddy fires a fresh PRINT START for the ghost rather than the
			
 
				+    SD cleanup that PRINT COMPLETE was supposed to run. Repeats every
			
 
				+    power cycle until the operator notices (#1542 follow-up). Reconciliation
			
 
				+    closes the loop by faking the missed PRINT COMPLETE — the existing
			
 
				+    cleanup chain handles SD-file deletion, status updates, usage tracking,
			
 
				+    and notifications.
			
 
				+
			
 
				+    Synthesised ``status="aborted"`` is the conservative label: we have no
			
 
				+    proof the print finished successfully (and no progress evidence to
			
 
				+    promote to ``"completed"``). The real PRINT COMPLETE callback, if it
			
 
				+    fires later, overwrites the status with the correct value.
			
 
				+
			
 
				+    Returns the number of archives reconciled.
			
 
				+    """
			
 
				+    state = printer_manager.get_status(printer_id)
			
 
				+    if not state:
			
 
				+        return 0
			
 
				+    # Don't reconcile while disconnected — we'd be making a decision against
			
 
				+    # stale cached state. The connected → reconcile edge handles this.
			
 
				+    if not state.connected:
			
 
				+        return 0
			
 
				+
			
 
				+    from backend.app.models.archive import PrintArchive
			
 
				+
			
 
				+    reconciled = 0
			
 
				+    async with async_session() as db:
			
 
				+        result = await db.execute(
			
 
				+            select(PrintArchive).where(
			
 
				+                PrintArchive.printer_id == printer_id,
			
 
				+                PrintArchive.status == "printing",
			
 
				+            )
			
 
				+        )
			
 
				+        active = list(result.scalars().all())
			
 
				+
			
 
				+    if not active:
			
 
				+        return 0
			
 
				+
			
 
				+    logger = logging.getLogger(__name__)
			
 
				+    for archive in active:
			
 
				+        is_stale, reason = _is_active_archive_stale(archive, state)
			
 
				+        if not is_stale:
			
 
				+            continue
			
 
				+        logger.info(
			
 
				+            "[RECONCILE] Printer %s: synthesising missed PRINT COMPLETE for archive %s (%s) — %s",
			
 
				+            printer_id,
			
 
				+            archive.id,
			
 
				+            archive.filename,
			
 
				+            reason,
			
 
				+        )
			
 
				+        # Synthesised payload: minimal fields the on_print_complete chain
			
 
				+        # needs. `_reconciled` marker lets downstream code distinguish this
			
 
				+        # from a real MQTT-driven completion if it ever needs to (e.g. for
			
 
				+        # metrics / debug logging). raw_data is the live printer state so
			
 
				+        # the usage tracker can compare end-of-print remain% against the
			
 
				+        # captured start values.
			
 
				+        try:
			
 
				+            await on_print_complete(
			
 
				+                printer_id,
			
 
				+                {
			
 
				+                    "status": "aborted",
			
 
				+                    "filename": archive.filename,
			
 
				+                    "subtask_name": archive.print_name or "",
			
 
				+                    "subtask_id": archive.subtask_id or "",
			
 
				+                    "raw_data": state.raw_data or {},
			
 
				+                    "_reconciled": True,
			
 
				+                },
			
 
				+            )
			
 
				+            reconciled += 1
			
 
				+        except Exception as e:
			
 
				+            # Catch-all: a reconciliation failure must not block the
			
 
				+            # printer's normal status flow. The archive stays in
			
 
				+            # ``status="printing"`` and the next reconnect retries.
			
 
				+            logger.warning(
			
 
				+                "[RECONCILE] on_print_complete synthesis failed for archive %s: %s",
			
 
				+                archive.id,
			
 
				+                e,
			
 
				+            )
			
 
				+
			
 
				+    return reconciled
			
 
				+
			
 
				+
			
 
				 async def on_print_complete(printer_id: int, data: dict):
			
 
				     """Handle print completion - update the archive status."""
			
 
				     import time
			
@@ -3246,24 +3497,43 @@ async def on_print_complete(printer_id: int, data: dict):
 
				                 if archive:
			
 
				                     archive_id = archive.id
			
 
				 
			
 
				-    # Cleanup: delete uploaded file from printer SD card to prevent phantom prints (Issue #374)
			
 
				-    # The print scheduler uploads files to the SD card root (/). Some printers (e.g. P1S)
			
 
				+    # Cleanup: delete uploaded file from printer SD card to prevent phantom prints (Issue #374, #1542)
			
 
				+    # The print scheduler uploads files to the SD card root (/). Some printers (e.g. P1S, A1)
			
 
				     # auto-start files found in root on power cycle, causing ghost prints.
			
 
				     # Must run before the archive_id early-return so it executes even when archiving is disabled.
			
 
				     try:
			
 
				         if subtask_name:
			
 
				+            archive_filename: str | None = None
			
 
				             async with async_session() as db:
			
 
				+                from backend.app.models.archive import PrintArchive
			
 
				                 from backend.app.models.printer import Printer
			
 
				 
			
 
				                 result = await db.execute(select(Printer).where(Printer.id == printer_id))
			
 
				                 printer = result.scalar_one_or_none()
			
 
				+                if archive_id:
			
 
				+                    archive_row = await db.execute(select(PrintArchive.filename).where(PrintArchive.id == archive_id))
			
 
				+                    archive_filename = archive_row.scalar_one_or_none()
			
 
				 
			
 
				             if printer:
			
 
				                 from backend.app.services.bambu_ftp import delete_file_async
			
 
				-
			
 
				-                # Try both .3mf and .gcode extensions — the printer may have either
			
 
				+                from backend.app.utils.filename import derive_remote_filename
			
 
				+
			
 
				+                # Primary candidate: the exact path the dispatcher uploaded to
			
 
				+                # (derived from archive.filename via the same rule as upload).
			
 
				+                # Without it, a library row that ended up with a doubled
			
 
				+                # .gcode.3mf (#1542) leaves the real file behind because the
			
 
				+                # subtask_name + ext fallbacks below don't match what's on the
			
 
				+                # SD card. Fallbacks remain for archive-less prints (subtask
			
 
				+                # never resolved to an archive) and for older naming variants.
			
 
				+                candidate_paths: list[str] = []
			
 
				+                if archive_filename:
			
 
				+                    candidate_paths.append(f"/{derive_remote_filename(archive_filename)}")
			
 
				                 for ext in (".3mf", ".gcode"):
			
 
				-                    remote_path = f"/{subtask_name}{ext}"
			
 
				+                    fallback = f"/{subtask_name}{ext}"
			
 
				+                    if fallback not in candidate_paths:
			
 
				+                        candidate_paths.append(fallback)
			
 
				+
			
 
				+                for remote_path in candidate_paths:
			
 
				                     # Retry up to 3 times — the printer may still lock the filesystem briefly after a print ends
			
 
				                     for attempt in range(1, 4):
			
 
				                         try:
			
@@ -4380,7 +4650,13 @@ RUNTIME_TRACKING_INTERVAL = 30  # Update every 30 seconds
 
				 
			
 
				 
			
 
				 async def track_printer_runtime():
			
 
				-    """Background task to track printer active runtime (RUNNING/PAUSE states)."""
			
 
				+    """Background task to track printer active runtime (RUNNING state only).
			
 
				+
			
 
				+    PAUSE is intentionally excluded — the runtime counter feeds hours-based
			
 
				+    maintenance intervals (rod lubrication, belt checks, nozzle cleaning)
			
 
				+    which track mechanical wear. Pause time has no motion and no wear, so
			
 
				+    counting it inflates maintenance warnings (#1521).
			
 
				+    """
			
 
				     logger = logging.getLogger(__name__)
			
 
				 
			
 
				     # Wait for MQTT connections to establish on startup
			
@@ -4418,7 +4694,7 @@ async def track_printer_runtime():
 
				                 new_runtime = runtime_secs
			
 
				                 new_last_update = last_update
			
 
				 
			
 
				-                if state.state in ("RUNNING", "PAUSE"):
			
 
				+                if state.state == "RUNNING":
			
 
				                     if last_update:
			
 
				                         lu = last_update if last_update.tzinfo else last_update.replace(tzinfo=timezone.utc)
			
 
				                         elapsed = (now - lu).total_seconds()
			
--- a/backend/app/models/api_key.py
+++ b/backend/app/models/api_key.py
@@ -30,6 +30,12 @@ class APIKey(Base):
 
				     can_queue: Mapped[bool] = mapped_column(Boolean, default=True)  # Add to queue
			
 
				     can_control_printer: Mapped[bool] = mapped_column(Boolean, default=False)  # Start/stop/cancel
			
 
				     can_read_status: Mapped[bool] = mapped_column(Boolean, default=True)  # Query status
			
 
				+    can_manage_library: Mapped[bool] = mapped_column(
			
 
				+        Boolean, default=True
			
 
				+    )  # Upload/rename/delete own library files + MakerWorld import
			
 
				+    can_manage_inventory: Mapped[bool] = mapped_column(
			
 
				+        Boolean, default=True
			
 
				+    )  # Inventory write ops (incl. SpoolBuddy kiosk NFC/scale/system)
			
 
				     can_access_cloud: Mapped[bool] = mapped_column(Boolean, default=False)  # Read /cloud/* on the owner's behalf
			
 
				     # Narrowly-scoped settings write: only POST /settings/electricity-price.
			
 
				     # Lets HA/Tibber-style automations push dynamic tariff updates without
			
--- a/backend/app/models/printer.py
+++ b/backend/app/models/printer.py
@@ -20,7 +20,9 @@ class Printer(Base):
 
				     is_active: Mapped[bool] = mapped_column(Boolean, default=True)
			
 
				     auto_archive: Mapped[bool] = mapped_column(Boolean, default=True)
			
 
				     print_hours_offset: Mapped[float] = mapped_column(Float, default=0.0)  # Baseline hours to add
			
 
				-    runtime_seconds: Mapped[int] = mapped_column(default=0)  # Accumulated active runtime (RUNNING/PAUSE states)
			
 
				+    runtime_seconds: Mapped[int] = mapped_column(
			
 
				+        default=0
			
 
				+    )  # Accumulated active runtime (RUNNING state only — see #1521)
			
 
				     last_runtime_update: Mapped[datetime | None] = mapped_column(
			
 
				         DateTime, nullable=True
			
 
				     )  # Last time runtime was updated
			
--- a/backend/app/models/virtual_printer.py
+++ b/backend/app/models/virtual_printer.py
@@ -5,6 +5,34 @@ from sqlalchemy.orm import Mapped, mapped_column
 
				 
			
 
				 from backend.app.core.database import Base
			
 
				 
			
 
				+# Canonical VP mode values. The legacy values `immediate` (→ archive) and
			
 
				+# `print_queue` (→ queue) shipped before the UI labels were aligned with the
			
 
				+# wire format. `normalize_vp_mode()` translates input from either form and
			
 
				+# the DB migration in `core/database.py` rewrites existing rows once at boot.
			
 
				+VP_MODE_ARCHIVE = "archive"
			
 
				+VP_MODE_REVIEW = "review"
			
 
				+VP_MODE_QUEUE = "queue"
			
 
				+VP_MODE_PROXY = "proxy"
			
 
				+VP_MODE_VALUES = (VP_MODE_ARCHIVE, VP_MODE_REVIEW, VP_MODE_QUEUE, VP_MODE_PROXY)
			
 
				+
			
 
				+# Legacy → canonical map. Kept narrow on purpose so unrelated typos surface
			
 
				+# instead of getting silently re-pointed at a default.
			
 
				+_VP_MODE_ALIASES = {
			
 
				+    "immediate": VP_MODE_ARCHIVE,
			
 
				+    "print_queue": VP_MODE_QUEUE,
			
 
				+}
			
 
				+
			
 
				+
			
 
				+def normalize_vp_mode(value: str | None) -> str | None:
			
 
				+    """Map legacy wire values (`immediate`, `print_queue`) to canonical names.
			
 
				+
			
 
				+    Returns `None` unchanged so callers can decide whether to apply a default.
			
 
				+    Returns unknown values unchanged so validators still see them and reject.
			
 
				+    """
			
 
				+    if value is None:
			
 
				+        return None
			
 
				+    return _VP_MODE_ALIASES.get(value, value)
			
 
				+
			
 
				 
			
 
				 class VirtualPrinter(Base):
			
 
				     """Virtual printer configuration for multi-instance support."""
			
@@ -14,13 +42,11 @@ class VirtualPrinter(Base):
 
				     id: Mapped[int] = mapped_column(primary_key=True)
			
 
				     name: Mapped[str] = mapped_column(String(100), default="Bambuddy")
			
 
				     enabled: Mapped[bool] = mapped_column(Boolean, default=False)
			
 
				-    mode: Mapped[str] = mapped_column(String(20), default="immediate")  # immediate|review|print_queue|proxy
			
 
				-    auto_dispatch: Mapped[bool] = mapped_column(
			
 
				-        Boolean, server_default="true"
			
 
				-    )  # print_queue mode: auto-start or manual
			
 
				+    mode: Mapped[str] = mapped_column(String(20), default=VP_MODE_ARCHIVE)  # archive|review|queue|proxy
			
 
				+    auto_dispatch: Mapped[bool] = mapped_column(Boolean, server_default="true")  # queue mode: auto-start or manual
			
 
				     queue_force_color_match: Mapped[bool] = mapped_column(
			
 
				         Boolean, server_default="false"
			
 
				-    )  # print_queue mode: pin per-slot type+color from the 3MF onto the queue
			
 
				+    )  # queue mode: pin per-slot type+color from the 3MF onto the queue
			
 
				     # item so the scheduler refuses to dispatch onto a printer with the wrong
			
 
				     # filament loaded (#1188).
			
 
				     model: Mapped[str | None] = mapped_column(String(50), nullable=True)  # SSDP model code (server mode)
			
--- a/backend/app/schemas/api_key.py
+++ b/backend/app/schemas/api_key.py
@@ -10,6 +10,8 @@ class APIKeyCreate(BaseModel):
 
				     can_queue: bool = True
			
 
				     can_control_printer: bool = False
			
 
				     can_read_status: bool = True
			
 
				+    can_manage_library: bool = True  # Upload / rename / delete own library files + MakerWorld import
			
 
				+    can_manage_inventory: bool = True  # Inventory writes — SpoolBuddy NFC/scale/system, manual stock edits via API
			
 
				     can_access_cloud: bool = False  # Read /cloud/* on the creator's behalf — default off (#1182)
			
 
				     can_update_energy_cost: bool = False  # POST /settings/electricity-price only (#1356)
			
 
				     printer_ids: list[int] | None = None  # null = all printers
			
@@ -23,6 +25,8 @@ class APIKeyUpdate(BaseModel):
 
				     can_queue: bool | None = None
			
 
				     can_control_printer: bool | None = None
			
 
				     can_read_status: bool | None = None
			
 
				+    can_manage_library: bool | None = None
			
 
				+    can_manage_inventory: bool | None = None
			
 
				     can_access_cloud: bool | None = None
			
 
				     can_update_energy_cost: bool | None = None
			
 
				     printer_ids: list[int] | None = None
			
@@ -40,6 +44,8 @@ class APIKeyResponse(BaseModel):
 
				     can_queue: bool
			
 
				     can_control_printer: bool
			
 
				     can_read_status: bool
			
 
				+    can_manage_library: bool
			
 
				+    can_manage_inventory: bool
			
 
				     can_access_cloud: bool
			
 
				     can_update_energy_cost: bool
			
 
				     printer_ids: list[int] | None
			
--- a/backend/app/schemas/archive.py
+++ b/backend/app/schemas/archive.py
@@ -147,6 +147,10 @@ class ArchiveStats(BaseModel):
 
				     total_prints: int
			
 
				     successful_prints: int
			
 
				     failed_prints: int
			
 
				+    # User/system-stopped prints (PrintLogEntry.status in stopped/cancelled/
			
 
				+    # skipped). Defaulted so older clients that don't send this field still
			
 
				+    # validate against historical fixtures.
			
 
				+    cancelled_prints: int = 0
			
 
				     total_print_time_hours: float
			
 
				     total_filament_grams: float
			
 
				     total_cost: float
			
--- a/backend/app/schemas/settings.py
+++ b/backend/app/schemas/settings.py
@@ -113,8 +113,8 @@ class AppSettings(BaseModel):
 
				     virtual_printer_enabled: bool = Field(default=False, description="Enable virtual printer for slicer uploads")
			
 
				     virtual_printer_access_code: str = Field(default="", description="Access code for virtual printer authentication")
			
 
				     virtual_printer_mode: str = Field(
			
 
				-        default="immediate",
			
 
				-        description="Mode: 'immediate' (archive now), 'review' (pending review), or 'print_queue' (add to print queue)",
			
 
				+        default="archive",
			
 
				+        description="Mode: 'archive' (archive now), 'review' (pending review), 'queue' (add to print queue), or 'proxy' (relay to real printer)",
			
 
				     )
			
 
				     virtual_printer_archive_name_source: str = Field(
			
 
				         default="metadata",
			
--- a/backend/app/services/archive.py
+++ b/backend/app/services/archive.py
@@ -16,6 +16,7 @@ from backend.app.core.config import settings
 
				 from backend.app.models.archive import PrintArchive
			
 
				 from backend.app.models.filament import Filament
			
 
				 from backend.app.models.printer import Printer
			
 
				+from backend.app.utils.safe_path import PathTraversalError, safe_join_under
			
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
 
				 
			
@@ -187,49 +188,78 @@ class ThreeMFParser:
 
				                             self.metadata["sliced_for_model"] = normalized
			
 
				                         break
			
 
				 
			
 
				-                # Find the plate element (single-plate exports only have one plate)
			
 
				-                plate = root.find(".//plate")
			
 
				-
			
 
				-                if plate is not None:
			
 
				-                    # Extract metadata from plate element
			
 
				+                # Loop every <plate> so multi-plate exports get summed file-level
			
 
				+                # totals. Pre-fix, this used `root.find(".//plate")` which
			
 
				+                # returned only the first plate — file-level `print_time_seconds`
			
 
				+                # / `filament_used_grams` reflected plate 1 alone, and the
			
 
				+                # archive card / project rollup under-reported by the number
			
 
				+                # of plates (#1593). Per-plate breakdown is still served by
			
 
				+                # the dedicated `/plates` endpoint.
			
 
				+                plates = root.findall(".//plate")
			
 
				+                summed_time = 0
			
 
				+                summed_grams = 0.0
			
 
				+                any_time_seen = False
			
 
				+                any_grams_seen = False
			
 
				+
			
 
				+                for plate in plates:
			
 
				+                    # Plate-level fields that only make sense at the file
			
 
				+                    # level when there's exactly one plate. ``plate_number``
			
 
				+                    # / ``_plate_index`` describe which plate the export
			
 
				+                    # represents — meaningless for an all-plates 3MF, so we
			
 
				+                    # only record them in the single-plate case. ``bed_type``
			
 
				+                    # is also single-valued; we take the first plate's value
			
 
				+                    # as a best-effort default for the archive metadata.
			
 
				+                    plate_index_value: int | None = None
			
 
				                     for meta in plate.findall("metadata"):
			
 
				                         key = meta.get("key")
			
 
				                         value = meta.get("value")
			
 
				                         if key == "index" and value:
			
 
				-                            # Extract plate index - this tells us which plate was exported
			
 
				                             try:
			
 
				-                                extracted_index = int(value)
			
 
				-                                # Set plate_number if not already set from filename
			
 
				-                                if not self.plate_number:
			
 
				-                                    self.plate_number = extracted_index
			
 
				-                                # Store in metadata for print_name generation
			
 
				-                                self.metadata["_plate_index"] = extracted_index
			
 
				+                                plate_index_value = int(value)
			
 
				                             except ValueError:
			
 
				                                 pass  # Skip non-numeric plate index
			
 
				                         elif key == "prediction" and value:
			
 
				-                            self.metadata["print_time_seconds"] = int(value)
			
 
				+                            try:
			
 
				+                                summed_time += int(value)
			
 
				+                                any_time_seen = True
			
 
				+                            except ValueError:
			
 
				+                                pass
			
 
				                         elif key == "weight" and value:
			
 
				-                            self.metadata["filament_used_grams"] = float(value)
			
 
				-                        elif key == "curr_bed_type" and value:
			
 
				-                            self.metadata["bed_type"] = value
			
 
				-
			
 
				-                    # Extract printable objects for skip object functionality
			
 
				-                    # Objects are stored as <object identify_id="123" name="Part1" skipped="false" />
			
 
				-                    printable_objects = {}
			
 
				-                    for obj in plate.findall("object"):
			
 
				-                        identify_id = obj.get("identify_id")
			
 
				-                        name = obj.get("name")
			
 
				-                        skipped = obj.get("skipped", "false")
			
 
				-
			
 
				-                        # Only include objects that are not pre-skipped
			
 
				-                        if identify_id and name and skipped.lower() != "true":
			
 
				                             try:
			
 
				-                                printable_objects[int(identify_id)] = name
			
 
				+                                summed_grams += float(value)
			
 
				+                                any_grams_seen = True
			
 
				                             except ValueError:
			
 
				-                                pass  # Skip objects with non-numeric identify_id
			
 
				+                                pass
			
 
				+                        elif key == "curr_bed_type" and value and "bed_type" not in self.metadata:
			
 
				+                            self.metadata["bed_type"] = value
			
 
				 
			
 
				-                    if printable_objects:
			
 
				-                        self.metadata["printable_objects"] = printable_objects
			
 
				+                    # Per-plate object lists are only kept at the file level
			
 
				+                    # when there's one plate — the skip-object affordance
			
 
				+                    # operates on the plate being printed, which is the
			
 
				+                    # `/plates` endpoint's job for multi-plate exports.
			
 
				+                    if len(plates) == 1:
			
 
				+                        if plate_index_value is not None:
			
 
				+                            if not self.plate_number:
			
 
				+                                self.plate_number = plate_index_value
			
 
				+                            self.metadata["_plate_index"] = plate_index_value
			
 
				+
			
 
				+                        printable_objects: dict[int, str] = {}
			
 
				+                        for obj in plate.findall("object"):
			
 
				+                            identify_id = obj.get("identify_id")
			
 
				+                            name = obj.get("name")
			
 
				+                            skipped = obj.get("skipped", "false")
			
 
				+                            if identify_id and name and skipped.lower() != "true":
			
 
				+                                try:
			
 
				+                                    printable_objects[int(identify_id)] = name
			
 
				+                                except ValueError:
			
 
				+                                    pass  # Skip objects with non-numeric identify_id
			
 
				+                        if printable_objects:
			
 
				+                            self.metadata["printable_objects"] = printable_objects
			
 
				+
			
 
				+                if any_time_seen:
			
 
				+                    self.metadata["print_time_seconds"] = summed_time
			
 
				+                if any_grams_seen:
			
 
				+                    self.metadata["filament_used_grams"] = round(summed_grams, 2)
			
 
				 
			
 
				                 # Get filament info from filaments ACTUALLY USED in the print
			
 
				                 # slice_info has <filament id="1" type="PLA" color="#FFFFFF" used_g="100" />
			
@@ -1084,7 +1114,9 @@ class ArchiveService:
 
				         archive_name = f"{timestamp}_{display_stem}"
			
 
				         # Use "unassigned" folder for archives without a printer
			
 
				         printer_folder = str(printer_id) if printer_id is not None else "unassigned"
			
 
				-        archive_dir = settings.archive_dir / printer_folder / archive_name
			
 
				+        archive_dir = (
			
 
				+            settings.archive_dir / printer_folder / archive_name
			
 
				+        )  # SEC-PATH-OK: printer_folder = str(int|None) → digits or "unassigned"; archive_name = f"{timestamp}_{display_stem}" where resolve_display_stem strips path components via Path(filename).name
			
 
				         archive_dir.mkdir(parents=True, exist_ok=True)
			
 
				 
			
 
				         # Copy 3MF file with an explicit fsync'd loop (avoids a sendfile
			
@@ -1448,12 +1480,29 @@ class ArchiveService:
 
				             return False
			
 
				 
			
 
				         # Get archive directory
			
 
				-        file_path = settings.base_dir / archive.file_path
			
 
				+        file_path = (
			
 
				+            settings.base_dir / archive.file_path
			
 
				+        )  # SEC-PATH-OK: archive.file_path is DB-stored, set by archive_print() under settings.archive_dir
			
 
				         archive_dir = file_path.parent
			
 
				 
			
 
				         # Save timelapse - use thread pool to avoid blocking event loop
			
 
				-        # (timelapse files can be 100MB+, sync write blocks for seconds)
			
 
				-        timelapse_file = archive_dir / filename
			
 
				+        # (timelapse files can be 100MB+, sync write blocks for seconds).
			
 
				+        # `filename` ultimately comes from a printer's FTP listing (compromised-
			
 
				+        # printer threat model) or a query param on /archives/{id}/timelapse/select;
			
 
				+        # the safe-join helper rejects ``..`` segments and absolute paths so a
			
 
				+        # crafted name can't escape the archive directory. Use http=False so a
			
 
				+        # service-layer reject surfaces as a return False (matching the existing
			
 
				+        # not-found contract) rather than a 400 raised from inside a background
			
 
				+        # task.
			
 
				+        try:
			
 
				+            timelapse_file = safe_join_under(archive_dir, filename, http=False)
			
 
				+        except PathTraversalError:
			
 
				+            logger.warning(
			
 
				+                "Refusing to attach timelapse with unsafe filename %r to archive %s",
			
 
				+                filename,
			
 
				+                archive_id,
			
 
				+            )
			
 
				+            return False
			
 
				         await asyncio.to_thread(timelapse_file.write_bytes, timelapse_data)
			
 
				 
			
 
				         # Update archive record
			
--- a/backend/app/services/background_dispatch.py
+++ b/backend/app/services/background_dispatch.py
@@ -32,6 +32,7 @@ from backend.app.services.bambu_ftp import (
 
				     with_ftp_retry,
			
 
				 )
			
 
				 from backend.app.services.printer_manager import printer_manager
			
 
				+from backend.app.utils.filename import derive_remote_filename
			
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
 
				 
			
@@ -580,14 +581,7 @@ class BackgroundDispatchService:
 
				             if not file_path.exists():
			
 
				                 raise RuntimeError("Archive file not found")
			
 
				 
			
 
				-            base_name = archive.filename
			
 
				-            if base_name.endswith(".gcode.3mf"):
			
 
				-                base_name = base_name[:-10]
			
 
				-            elif base_name.endswith(".3mf"):
			
 
				-                base_name = base_name[:-4]
			
 
				-            remote_filename = f"{base_name}.3mf"
			
 
				-            # Sanitize: firmware parses ftp://{filename} as a URL, spaces break it
			
 
				-            remote_filename = remote_filename.replace(" ", "_")
			
 
				+            remote_filename = derive_remote_filename(archive.filename)
			
 
				             remote_path = f"/{remote_filename}"
			
 
				 
			
 
				             ftp_retry_enabled, ftp_retry_count, ftp_retry_delay, ftp_timeout = await get_ftp_retry_settings()
			
@@ -784,14 +778,7 @@ class BackgroundDispatchService:
 
				 
			
 
				             await db.flush()
			
 
				 
			
 
				-            base_name = lib_file.filename
			
 
				-            if base_name.endswith(".gcode.3mf"):
			
 
				-                base_name = base_name[:-10]
			
 
				-            elif base_name.endswith(".3mf"):
			
 
				-                base_name = base_name[:-4]
			
 
				-            remote_filename = f"{base_name}.3mf"
			
 
				-            # Sanitize: firmware parses ftp://{filename} as a URL, spaces break it
			
 
				-            remote_filename = remote_filename.replace(" ", "_")
			
 
				+            remote_filename = derive_remote_filename(lib_file.filename)
			
 
				             remote_path = f"/{remote_filename}"
			
 
				 
			
 
				             ftp_retry_enabled, ftp_retry_count, ftp_retry_delay, ftp_timeout = await get_ftp_retry_settings()
			
--- a/backend/app/services/bambu_cloud.py
+++ b/backend/app/services/bambu_cloud.py
@@ -22,6 +22,50 @@ BAMBU_API_BASE_CN = "https://api.bambulab.cn"
 
				 # introduce ourselves as official Bambu Studio.
			
 
				 _USER_AGENT = "Bambuddy/1.0 (+https://github.com/maziggy/bambuddy)"
			
 
				 
			
 
				+# Cloudflare protection on Bambu Lab's edge intermittently returns interstitials /
			
 
				+# challenges instead of the JSON the API normally produces (issue #1575). The
			
 
				+# parse error that results is opaque — these helpers detect the CF markers so
			
 
				+# we can surface an actionable message instead of "Invalid response from Bambu Cloud".
			
 
				+_CF_INTERSTITIAL_USER_MESSAGE = (
			
 
				+    "Bambu Cloud is temporarily blocking automated requests from your network. "
			
 
				+    "This is a Cloudflare protection on Bambu Lab's side, not a Bambuddy issue. "
			
 
				+    "Please wait a few minutes and try again. If it persists, signing in to "
			
 
				+    "bambulab.com once from a browser on the same network usually clears the "
			
 
				+    "challenge."
			
 
				+)
			
 
				+
			
 
				+
			
 
				+def _detect_cloudflare_challenge(response) -> str | None:
			
 
				+    """Return a user-actionable message when the response is a Cloudflare
			
 
				+    challenge / mitigation page instead of the JSON the API normally returns.
			
 
				+
			
 
				+    Triggers on any of:
			
 
				+      - body contains "Just a moment..." (CF interactive challenge title)
			
 
				+      - body contains "challenges.cloudflare.com" (CF turnstile widget src)
			
 
				+      - HTTP 403 with a "cf-mitigated" response header (CF blocked)
			
 
				+      - HTTP 503 with a "cf-ray" response header (CF Under Attack mode)
			
 
				+
			
 
				+    Returns None when the response doesn't look like a CF challenge — callers
			
 
				+    fall through to their existing error path.
			
 
				+    """
			
 
				+    try:
			
 
				+        body = response.text or ""
			
 
				+    except Exception:
			
 
				+        body = ""
			
 
				+    if "Just a moment..." in body or "challenges.cloudflare.com" in body:
			
 
				+        return _CF_INTERSTITIAL_USER_MESSAGE
			
 
				+    try:
			
 
				+        status = int(getattr(response, "status_code", 0) or 0)
			
 
				+    except (TypeError, ValueError):
			
 
				+        status = 0
			
 
				+    headers = getattr(response, "headers", {}) or {}
			
 
				+    if status == 403 and "cf-mitigated" in headers:
			
 
				+        return _CF_INTERSTITIAL_USER_MESSAGE
			
 
				+    if status == 503 and "cf-ray" in headers:
			
 
				+        return _CF_INTERSTITIAL_USER_MESSAGE
			
 
				+    return None
			
 
				+
			
 
				+
			
 
				 # The `/v1/iot-service/api/slicer/setting` endpoint requires a `version` query
			
 
				 # parameter in the XX.YY.ZZ.WW format Bambu Studio releases use (without it the
			
 
				 # API returns HTTP 400 "field 'version' is not set"; non-matching formats like
			
@@ -114,7 +158,16 @@ class BambuCloudService:
 
				                 },
			
 
				             )
			
 
				 
			
 
				-            data = response.json()
			
 
				+            try:
			
 
				+                data = response.json()
			
 
				+            except Exception as json_err:
			
 
				+                logger.error("Failed to parse login response: %s, body: %s", json_err, response.text[:500])
			
 
				+                cf_message = _detect_cloudflare_challenge(response)
			
 
				+                return {
			
 
				+                    "success": False,
			
 
				+                    "needs_verification": False,
			
 
				+                    "message": cf_message or "Invalid response from Bambu Cloud",
			
 
				+                }
			
 
				             logger.debug(
			
 
				                 f"Login response: status={response.status_code}, loginType={data.get('loginType')}, hasTfaKey={'tfaKey' in data}"
			
 
				             )
			
@@ -170,7 +223,12 @@ class BambuCloudService:
 
				                 },
			
 
				             )
			
 
				 
			
 
				-            data = response.json()
			
 
				+            try:
			
 
				+                data = response.json()
			
 
				+            except Exception as json_err:
			
 
				+                logger.error("Failed to parse email-verify response: %s, body: %s", json_err, response.text[:500])
			
 
				+                cf_message = _detect_cloudflare_challenge(response)
			
 
				+                return {"success": False, "message": cf_message or "Invalid response from Bambu Cloud"}
			
 
				             logger.debug("Email verify response: status=%s, hasToken=%s", response.status_code, "accessToken" in data)
			
 
				 
			
 
				             if response.status_code == 200 and "accessToken" in data:
			
@@ -230,7 +288,8 @@ class BambuCloudService:
 
				                 data = response.json()
			
 
				             except Exception as json_err:
			
 
				                 logger.error("Failed to parse TOTP response: %s, body: %s", json_err, response.text[:500])
			
 
				-                return {"success": False, "message": "Invalid response from Bambu Cloud"}
			
 
				+                cf_message = _detect_cloudflare_challenge(response)
			
 
				+                return {"success": False, "message": cf_message or "Invalid response from Bambu Cloud"}
			
 
				 
			
 
				             # Token might be in accessToken, token field, or cookies
			
 
				             access_token = data.get("accessToken") or data.get("token")
			
--- a/backend/app/services/camera.py
+++ b/backend/app/services/camera.py
@@ -651,7 +651,9 @@ async def capture_finish_photo(
 
				     # Generate filename with timestamp
			
 
				     timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
			
 
				     filename = f"finish_{timestamp}_{uuid.uuid4().hex[:8]}.jpg"
			
 
				-    output_path = photos_dir / filename
			
 
				+    output_path = (
			
 
				+        photos_dir / filename
			
 
				+    )  # SEC-PATH-OK: filename = f"finish_{timestamp}_{uuid.uuid4().hex[:8]}.jpg" generated above
			
 
				 
			
 
				     success = await capture_camera_frame(
			
 
				         ip_address=ip_address,
			
--- a/backend/app/services/failure_analysis.py
+++ b/backend/app/services/failure_analysis.py
@@ -75,6 +75,11 @@ class FailureAnalysisService:
 
				         total_result = await self.db.execute(select(func.count(PrintLogEntry.id)).where(and_(*base_filter)))
			
 
				         total_prints = total_result.scalar() or 0
			
 
				 
			
 
				+        successful_result = await self.db.execute(
			
 
				+            select(func.count(PrintLogEntry.id)).where(and_(*base_filter, PrintLogEntry.status == "completed"))
			
 
				+        )
			
 
				+        successful_prints = successful_result.scalar() or 0
			
 
				+
			
 
				         failed_result = await self.db.execute(
			
 
				             select(func.count(PrintLogEntry.id)).where(
			
 
				                 and_(*base_filter, PrintLogEntry.status.in_(["failed", "aborted"]))
			
@@ -82,7 +87,14 @@ class FailureAnalysisService:
 
				         )
			
 
				         failed_prints = failed_result.scalar() or 0
			
 
				 
			
 
				-        failure_rate = (failed_prints / total_prints * 100) if total_prints > 0 else 0
			
 
				+        # Failure rate divides by quality-outcome prints only — a cancelled or
			
 
				+        # skipped print is neither a success nor a failure of the printer, so
			
 
				+        # including it in the denominator silently lowered the displayed rate
			
 
				+        # whenever the user stopped jobs (#1390). Total Prints (the absolute
			
 
				+        # count incl. cancelled) is still returned separately for the "X / Y
			
 
				+        # prints failed" caption.
			
 
				+        outcome_prints = successful_prints + failed_prints
			
 
				+        failure_rate = (failed_prints / outcome_prints * 100) if outcome_prints > 0 else 0
			
 
				 
			
 
				         # Failures by reason
			
 
				         reason_result = await self.db.execute(
			
@@ -188,6 +200,9 @@ class FailureAnalysisService:
 
				             ]
			
 
				 
			
 
				             week_total = await self.db.execute(select(func.count(PrintLogEntry.id)).where(and_(*week_filter)))
			
 
				+            week_successful = await self.db.execute(
			
 
				+                select(func.count(PrintLogEntry.id)).where(and_(*week_filter, PrintLogEntry.status == "completed"))
			
 
				+            )
			
 
				             week_failed = await self.db.execute(
			
 
				                 select(func.count(PrintLogEntry.id)).where(
			
 
				                     and_(*week_filter, PrintLogEntry.status.in_(["failed", "aborted"]))
			
@@ -195,8 +210,10 @@ class FailureAnalysisService:
 
				             )
			
 
				 
			
 
				             total = week_total.scalar() or 0
			
 
				+            successful = week_successful.scalar() or 0
			
 
				             failed = week_failed.scalar() or 0
			
 
				-            rate = (failed / total * 100) if total > 0 else 0
			
 
				+            week_outcome = successful + failed
			
 
				+            rate = (failed / week_outcome * 100) if week_outcome > 0 else 0
			
 
				 
			
 
				             trend_data.append(
			
 
				                 {
			
--- a/backend/app/services/library_trash.py
+++ b/backend/app/services/library_trash.py
@@ -64,7 +64,9 @@ def _to_absolute_path(relative_path: str | None) -> Path | None:
 
				     path = Path(relative_path)
			
 
				     if path.is_absolute():
			
 
				         return path
			
 
				-    return Path(app_settings.base_dir) / path
			
 
				+    return (
			
 
				+        Path(app_settings.base_dir) / path
			
 
				+    )  # SEC-PATH-OK: relative_path is LibraryFile.file_path / LibraryFile.thumbnail_path — DB-stored, internally generated by the upload pipeline
			
 
				 
			
 
				 
			
 
				 def _age_cutoff(now: datetime, older_than_days: int) -> datetime:
			
--- a/backend/app/services/local_backup.py
+++ b/backend/app/services/local_backup.py
@@ -223,7 +223,9 @@ class LocalBackupService:
 
				         if not filename.startswith("bambuddy-backup-") or not filename.endswith(".zip"):
			
 
				             return None
			
 
				         backup_dir = self._resolve_backup_dir(path_setting)
			
 
				-        target = backup_dir / filename
			
 
				+        target = (
			
 
				+            backup_dir / filename
			
 
				+        )  # SEC-PATH-OK: filename rejected above on /, \\, .., plus startswith "bambuddy-backup-" + endswith ".zip" gate
			
 
				         if not target.exists():
			
 
				             return None
			
 
				         return target
			
@@ -253,7 +255,9 @@ class LocalBackupService:
 
				             return {"success": False, "message": "Invalid filename"}
			
 
				 
			
 
				         backup_dir = self._resolve_backup_dir(path_setting)
			
 
				-        target = backup_dir / filename
			
 
				+        target = (
			
 
				+            backup_dir / filename
			
 
				+        )  # SEC-PATH-OK: filename rejected above on /, \\, .., plus startswith "bambuddy-backup-" + endswith ".zip" gate below
			
 
				 
			
 
				         if not target.exists():
			
 
				             return {"success": False, "message": "Backup not found"}
			
--- a/backend/app/services/notification_service.py
+++ b/backend/app/services/notification_service.py
@@ -20,6 +20,47 @@ from backend.app.models.notification_template import NotificationTemplate
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
 
				 
			
 
				+# Honest User-Agent — matches the convention used by every other outbound
			
 
				+# httpx client in the codebase (bambu_cloud, makerworld, firmware_check,
			
 
				+# inventory). Previously this client leaked python-httpx/<version>, which
			
 
				+# was both inconsistent with the rest of the project and a more obvious
			
 
				+# bot signature for upstream WAFs.
			
 
				+_USER_AGENT = "Bambuddy/1.0 (+https://github.com/maziggy/bambuddy)"
			
 
				+
			
 
				+
			
 
				+def _looks_like_cloudflare_challenge(response: httpx.Response) -> bool:
			
 
				+    """Return True if ``response`` looks like a Cloudflare mitigation
			
 
				+    interstitial (JS challenge / managed challenge / block page) rather
			
 
				+    than a legitimate response passed through Cloudflare.
			
 
				+
			
 
				+    Self-hosted servers behind Cloudflare (Tunnel, "Bot Fight Mode", or
			
 
				+    "Under Attack" mode) intercept non-browser clients at the edge and
			
 
				+    return a challenge HTML page instead of forwarding to the origin —
			
 
				+    so we never reach the user's actual ntfy / webhook backend.
			
 
				+    Cloudflare cannot be defeated from a Python client; the user has to
			
 
				+    add a security-skip rule on their side. We detect the shape so the
			
 
				+    UI can tell them that, instead of dumping the raw HTML.
			
 
				+
			
 
				+    Detection deliberately does NOT rely on ``Server: cloudflare`` alone
			
 
				+    — Cloudflare adds that header to every response it proxies (success
			
 
				+    AND legitimate origin errors), so a real 401 "wrong token" from a
			
 
				+    CF-fronted ntfy would false-positive into a misleading "your CF is
			
 
				+    blocking" message. Reliable signals: the ``cf-mitigated`` header
			
 
				+    (set only when CF actively mitigates) and the challenge body shape.
			
 
				+    """
			
 
				+    if response.headers.get("cf-mitigated"):
			
 
				+        return True
			
 
				+    content_type = (response.headers.get("content-type") or "").lower()
			
 
				+    if "html" not in content_type:
			
 
				+        return False
			
 
				+    body = (response.text or "")[:1024].lower()
			
 
				+    # "Just a moment..." is Cloudflare's universal challenge-page title
			
 
				+    # (managed challenge, JS challenge, Under Attack mode). Combined with
			
 
				+    # an HTML content-type this is unambiguous — no legitimate ntfy or
			
 
				+    # webhook backend returns HTML with that title. ``cf-chl-*`` and
			
 
				+    # ``challenge-platform`` cover newer / non-default CF templates.
			
 
				+    return "just a moment" in body or "cf-chl-bypass" in body or "cf-chl-opt" in body or "challenge-platform" in body
			
 
				+
			
 
				 
			
 
				 class NotificationService:
			
 
				     """Service for sending notifications through various providers."""
			
@@ -33,7 +74,10 @@ class NotificationService:
 
				     async def _get_client(self) -> httpx.AsyncClient:
			
 
				         """Get or create HTTP client."""
			
 
				         if self._http_client is None or self._http_client.is_closed:
			
 
				-            self._http_client = httpx.AsyncClient(timeout=30.0)
			
 
				+            self._http_client = httpx.AsyncClient(
			
 
				+                timeout=30.0,
			
 
				+                headers={"User-Agent": _USER_AGENT},
			
 
				+            )
			
 
				         return self._http_client
			
 
				 
			
 
				     async def close(self):
			
@@ -264,8 +308,16 @@ class NotificationService:
 
				 
			
 
				         if response.status_code in (200, 204):
			
 
				             return True, "Message sent successfully"
			
 
				-        else:
			
 
				-            return False, f"HTTP {response.status_code}: {response.text[:200]}"
			
 
				+        if _looks_like_cloudflare_challenge(response):
			
 
				+            return False, (
			
 
				+                f"HTTP {response.status_code} — ntfy server is behind a Cloudflare "
			
 
				+                "challenge. Bambuddy was served the JS challenge page instead of "
			
 
				+                "reaching ntfy. Cloudflare cannot be solved from a backend; add a "
			
 
				+                "Cloudflare security-skip rule for this hostname, disable Bot "
			
 
				+                "Fight Mode, or front the server with Cloudflare Access using a "
			
 
				+                "service token. (#1534)"
			
 
				+            )
			
 
				+        return False, f"HTTP {response.status_code}: {response.text[:200]}"
			
 
				 
			
 
				     async def _send_pushover(
			
 
				         self, config: dict, title: str, message: str, image_data: bytes | None = None
			
--- a/backend/app/services/print_scheduler.py
+++ b/backend/app/services/print_scheduler.py
@@ -32,6 +32,7 @@ from backend.app.services.filament_deficit import compute_deficit_for_queue_item
 
				 from backend.app.services.notification_service import notification_service
			
 
				 from backend.app.services.printer_manager import printer_manager, supports_drying
			
 
				 from backend.app.services.smart_plug_manager import smart_plug_manager
			
 
				+from backend.app.utils.filename import derive_remote_filename
			
 
				 from backend.app.utils.printer_models import normalize_printer_model
			
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
@@ -2013,18 +2014,9 @@ class PrintScheduler:
 
				             except Exception as e:
			
 
				                 logger.warning("Queue item %s: G-code injection failed, using original: %s", item.id, e)
			
 
				 
			
 
				-        # Upload file to printer via FTP
			
 
				-        # Use a clean filename to avoid issues with double extensions like .gcode.3mf
			
 
				-        base_name = filename
			
 
				-        if base_name.endswith(".gcode.3mf"):
			
 
				-            base_name = base_name[:-10]  # Remove .gcode.3mf
			
 
				-        elif base_name.endswith(".3mf"):
			
 
				-            base_name = base_name[:-4]  # Remove .3mf
			
 
				-        remote_filename = f"{base_name}.3mf"
			
 
				-        # Sanitize: firmware parses ftp://{filename} as a URL, spaces break it
			
 
				-        remote_filename = remote_filename.replace(" ", "_")
			
 
				         # Upload to root directory (not /cache/) - the start_print command references
			
 
				         # files by name only (ftp://{filename}), so they must be in the root
			
 
				+        remote_filename = derive_remote_filename(filename)
			
 
				         remote_path = f"/{remote_filename}"
			
 
				 
			
 
				         # Get FTP retry settings
			
--- a/backend/app/services/spool_tag_matcher.py
+++ b/backend/app/services/spool_tag_matcher.py
@@ -100,7 +100,15 @@ async def create_spool_from_tray(db: AsyncSession, tray_data: dict) -> Spool:
 
				     rgba = tray_color if tray_color else None
			
 
				     color_name = None
			
 
				 
			
 
				-    if rgba and len(rgba) >= 6:
			
 
				+    # Transparent filament (#1545): the AMS reports alpha=00 for clear spools.
			
 
				+    # Skip the catalog lookup — the catalog only stores RGB so 000000 would
			
 
				+    # resolve to "Black" (or whatever else lives at that RGB), which is exactly
			
 
				+    # the bug the cream rewrite in parse_ams_tray used to paper over. Store
			
 
				+    # "Clear" directly and let the frontend's resolveSpoolColorName +
			
 
				+    # hexToColorName render the swatch as a checkerboard.
			
 
				+    if rgba and len(rgba) == 8 and rgba[6:8].lower() == "00":
			
 
				+        color_name = "Clear"
			
 
				+    elif rgba and len(rgba) >= 6:
			
 
				         hex_prefix = f"#{rgba[:6].upper()}"
			
 
				         cat_query = (
			
 
				             select(ColorCatalogEntry)
			
--- a/backend/app/services/spoolman.py
+++ b/backend/app/services/spoolman.py
@@ -909,10 +909,13 @@ class SpoolmanClient:
 
				             logger.debug("Skipping tray with empty color")
			
 
				             return None
			
 
				 
			
 
				-        # Handle transparent/natural filament (RRGGBBAA with alpha=00)
			
 
				-        # Replace with cream color that represents how natural PLA actually looks
			
 
				-        if tray_color == "00000000":
			
 
				-            tray_color = "F5E6D3FF"  # Light cream/natural color
			
 
				+        # Transparent filament (alpha=00) used to be rewritten to a cream
			
 
				+        # "natural PLA" colour before being stored, because the swatch
			
 
				+        # renderer couldn't show alpha. The swatch now paints a checkerboard
			
 
				+        # underlay for translucent rgbas (see filamentSwatchHelpers.ts), so
			
 
				+        # we pass `00000000` through verbatim — the inventory row keeps the
			
 
				+        # AMS-reported colour and the frontend resolves the name to "Clear"
			
 
				+        # via getColorName (#1545).
			
 
				 
			
 
				         # Get sub_brands, falling back to tray_type
			
 
				         tray_sub_brands = tray_data.get("tray_sub_brands", "")
			
--- a/backend/app/services/spoolman_tracking.py
+++ b/backend/app/services/spoolman_tracking.py
@@ -212,7 +212,9 @@ async def store_print_data(
 
				         return
			
 
				 
			
 
				     # Get 3MF file path
			
 
				-    full_path = app_settings.base_dir / file_path
			
 
				+    full_path = (
			
 
				+        app_settings.base_dir / file_path
			
 
				+    )  # SEC-PATH-OK: file_path is archive.file_path / library_file.file_path — DB-stored, internally generated
			
 
				     if not full_path.exists():
			
 
				         logger.debug("[SPOOLMAN] 3MF file not found: %s", full_path)
			
 
				         return
			
--- a/backend/app/services/stl_thumbnail.py
+++ b/backend/app/services/stl_thumbnail.py
@@ -4,11 +4,52 @@ Generates thumbnail images from STL files using trimesh and matplotlib.
 
				 """
			
 
				 
			
 
				 import logging
			
 
				+import os
			
 
				 import uuid
			
 
				 from pathlib import Path
			
 
				 
			
 
				 logger = logging.getLogger(__name__)
			
 
				 
			
 
				+# Matplotlib's font_manager emits one INFO line per font on first import
			
 
				+# while it builds its cache, including a noisy "Failed to extract font
			
 
				+# properties from NotoColorEmoji.ttf" for the COLR/COLR1 emoji format it
			
 
				+# doesn't support. These are not actionable — demote to WARNING so real
			
 
				+# font issues still surface but the first STL upload doesn't produce a
			
 
				+# multi-line matplotlib preamble in the journal.
			
 
				+logging.getLogger("matplotlib.font_manager").setLevel(logging.WARNING)
			
 
				+
			
 
				+
			
 
				+def _configure_matplotlib_cache() -> None:
			
 
				+    """Point matplotlib's config/cache directory at a writable persistent path.
			
 
				+
			
 
				+    Without this, matplotlib falls back to ``/tmp/matplotlib-XXXXXX`` whenever
			
 
				+    ``$HOME/.config/matplotlib`` isn't writable — which is the case under
			
 
				+    Bambuddy's container / systemd-service deployments where ``$HOME`` is set
			
 
				+    to a non-writable path. The fallback emits a WARNING on every cold start
			
 
				+    AND loses the font cache on host reboot, so font_manager rebuilds it
			
 
				+    every time → another batch of INFO lines.
			
 
				+
			
 
				+    Setting ``MPLCONFIGDIR`` to ``settings.base_dir / .cache / matplotlib``
			
 
				+    eliminates both: the warning never fires, and the cache survives across
			
 
				+    restarts so the per-font scan only runs once per deployment.
			
 
				+    Idempotent — respects an externally-set ``MPLCONFIGDIR`` if the operator
			
 
				+    chose their own path.
			
 
				+    """
			
 
				+    if os.environ.get("MPLCONFIGDIR"):
			
 
				+        return
			
 
				+    try:
			
 
				+        from backend.app.core.config import settings
			
 
				+
			
 
				+        cache_dir = Path(settings.base_dir) / ".cache" / "matplotlib"
			
 
				+        cache_dir.mkdir(parents=True, exist_ok=True)
			
 
				+        os.environ["MPLCONFIGDIR"] = str(cache_dir)
			
 
				+    except Exception as exc:
			
 
				+        # Best-effort. If settings isn't importable or the mkdir fails (read-only
			
 
				+        # FS, permission denied), let matplotlib fall back to /tmp with its
			
 
				+        # built-in warning — same as today's behaviour, no worse.
			
 
				+        logger.debug("Could not configure MPLCONFIGDIR: %s", exc)
			
 
				+
			
 
				+
			
 
				 # Bambu green color for rendering
			
 
				 BAMBU_GREEN = "#00AE42"
			
 
				 BACKGROUND_COLOR = "#1a1a1a"
			
@@ -16,6 +57,14 @@ BACKGROUND_COLOR = "#1a1a1a"
 
				 # Maximum vertices before simplification
			
 
				 MAX_VERTICES = 100000
			
 
				 
			
 
				+# Minimum STL file size that could possibly contain a usable mesh:
			
 
				+# - Binary STL with one triangle: 80B header + 4B count + 50B triangle = 134B
			
 
				+# - ASCII STL with one triangle: header + "facet ... endfacet" + footer ≈ 150B
			
 
				+# Files below this are stubs / placeholders / corrupted; trimesh would return an
			
 
				+# empty mesh anyway. Pre-skipping at the call sites suppresses the warning storm
			
 
				+# bulk-uploaded ZIPs of small test STLs used to produce.
			
 
				+MIN_USABLE_STL_BYTES = 200
			
 
				+
			
 
				 
			
 
				 def generate_stl_thumbnail(
			
 
				     stl_path: Path,
			
@@ -39,6 +88,10 @@ def generate_stl_thumbnail(
 
				     thumbnails_dir = Path(thumbnails_dir)
			
 
				 
			
 
				     try:
			
 
				+        # Must precede the matplotlib import — MPLCONFIGDIR is read at
			
 
				+        # matplotlib import time, not on subsequent attribute access.
			
 
				+        _configure_matplotlib_cache()
			
 
				+
			
 
				         import matplotlib
			
 
				         import trimesh
			
 
				 
			
@@ -52,7 +105,14 @@ def generate_stl_thumbnail(
 
				         mesh = trimesh.load(str(stl_path), force="mesh")
			
 
				 
			
 
				         if mesh is None or not hasattr(mesh, "vertices") or len(mesh.vertices) == 0:
			
 
				-            logger.warning("Failed to load STL or empty mesh: %s", stl_path)
			
 
				+            # Demoted from warning to debug: this is a per-file content
			
 
				+            # observation (the STL is empty / stub / corrupted), not an
			
 
				+            # actionable error. The caller proceeds correctly with no
			
 
				+            # thumbnail. The call sites also pre-skip files below
			
 
				+            # MIN_USABLE_STL_BYTES so the common stub-STL case never gets
			
 
				+            # this far — this branch now catches only the rare "large
			
 
				+            # enough but trimesh still can't parse it" case.
			
 
				+            logger.debug("Failed to load STL or empty mesh: %s", stl_path)
			
 
				             return None
			
 
				 
			
 
				         # Simplify large meshes for performance
			
@@ -122,7 +182,7 @@ def generate_stl_thumbnail(
 
				 
			
 
				         # Save thumbnail
			
 
				         thumb_filename = f"{uuid.uuid4().hex}.png"
			
 
				-        thumb_path = thumbnails_dir / thumb_filename
			
 
				+        thumb_path = thumbnails_dir / thumb_filename  # SEC-PATH-OK: thumb_filename = uuid.uuid4().hex + ".png"
			
 
				 
			
 
				         fig.savefig(
			
 
				             thumb_path,
			
--- a/backend/app/services/usage_tracker.py
+++ b/backend/app/services/usage_tracker.py
@@ -1223,14 +1223,26 @@ async def _track_from_3mf(
 
				                 if isinstance(mapped, int) and mapped >= 0:
			
 
				                     global_tray_id = mapped
			
 
				             # Position-based default: sort available tray IDs so external spools (254/255)
			
 
				-            # naturally follow standard AMS trays, matching slicer slot numbering
			
 
				+            # naturally follow standard AMS trays, matching slicer slot numbering.
			
 
				+            #
			
 
				+            # Filter out AMS slots that have no spool loaded (empty `tray_type`) —
			
 
				+            # BambuStudio/OrcaSlicer compact the slot list when assigning filaments
			
 
				+            # and don't expose empty AMS slots to the user, so the slicer's 3MF
			
 
				+            # slot N maps to the Nth *loaded* tray, not the Nth physical position.
			
 
				+            # Without this filter a "3 AMS slots loaded + 1 empty + external"
			
 
				+            # layout routes the slicer's 4th filament to the empty AMS slot
			
 
				+            # instead of the external (#1607), and the external's spool usage
			
 
				+            # never gets recorded. vt_tray entries are already filtered the
			
 
				+            # same way inside `build_ams_tray_lookup` (line 174 checks
			
 
				+            # `tray_type`), so this just mirrors that for the AMS side.
			
 
				             if global_tray_id is None:
			
 
				                 _state = printer_manager.get_status(printer_id)
			
 
				                 _raw = getattr(_state, "raw_data", None) if _state else None
			
 
				                 if _raw:
			
 
				                     from backend.app.services.spoolman_tracking import build_ams_tray_lookup
			
 
				 
			
 
				-                    available_trays = sorted(build_ams_tray_lookup(_raw).keys())
			
 
				+                    _lookup = build_ams_tray_lookup(_raw)
			
 
				+                    available_trays = sorted(gid for gid, info in _lookup.items() if info.get("tray_type"))
			
 
				                     if slot_id <= len(available_trays):
			
 
				                         global_tray_id = available_trays[slot_id - 1]
			
 
				             # Final fallback: slot_id - 1 (legacy, works for pure AMS without external spools)
			
--- a/backend/app/services/virtual_printer/bind_server.py
+++ b/backend/app/services/virtual_printer/bind_server.py
@@ -64,6 +64,11 @@ class BindServer:
 
				 
			
 
				         self._servers: list[asyncio.Server] = []
			
 
				         self._running = False
			
 
				+        # Set after at least one bind port is listening — see ftp_server.py
			
 
				+        # for rationale. Bind server is best-effort across BIND_PORTS, so
			
 
				+        # "ready" means "at least one port bound", matching the existing
			
 
				+        # serve_forever path.
			
 
				+        self.ready = asyncio.Event()
			
 
				 
			
 
				     def _create_tls_context(self) -> ssl.SSLContext | None:
			
 
				         """Create SSL context for the TLS bind port (3002)."""
			
@@ -72,6 +77,15 @@ class BindServer:
 
				         ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
			
 
				         ctx.load_cert_chain(str(self.cert_path), str(self.key_path))
			
 
				         ctx.minimum_version = ssl.TLSVersion.TLSv1_2
			
 
				+        # Match real Bambu printer cipher behaviour: include the plain-RSA
			
 
				+        # AES-GCM suites the slicer's bind/connect path expects. On hardened
			
 
				+        # distros (Fedora / RHEL with `update-crypto-policies`, hardened Alpine
			
 
				+        # builds) the OpenSSL `DEFAULT` list strips these suites, leaving no
			
 
				+        # overlap with the slicer's ClientHello and producing `code=-1` on the
			
 
				+        # slicer side (#1610). Same fix the #620 client-side patch applied to
			
 
				+        # `tcp_proxy.py::_create_client_ssl_context`; the bind-server / server
			
 
				+        # side needs it too.
			
 
				+        ctx.set_ciphers("DEFAULT:AES256-GCM-SHA384:AES128-GCM-SHA256")
			
 
				         ctx.verify_mode = ssl.CERT_NONE
			
 
				         return ctx
			
 
				 
			
@@ -122,6 +136,7 @@ class BindServer:
 
				             if not self._servers:
			
 
				                 logger.error("Bind server: could not bind to any port")
			
 
				                 return
			
 
				+            self.ready.set()
			
 
				 
			
 
				             # Serve all successfully bound ports
			
 
				             await asyncio.gather(*(s.serve_forever() for s in self._servers))
			
@@ -137,6 +152,7 @@ class BindServer:
 
				         """Stop the bind server."""
			
 
				         logger.info("Stopping bind server")
			
 
				         self._running = False
			
 
				+        self.ready.clear()
			
 
				 
			
 
				         for server in self._servers:
			
 
				             try:
			
@@ -176,7 +192,14 @@ class BindServer:
 
				                 logger.warning("Bind server: unexpected command from %s: %s", client_id, request)
			
 
				                 return
			
 
				 
			
 
				-            # Build response
			
 
				+            # Build response. `sequence_id` is an INTEGER counter chosen by
			
 
				+            # the printer side (not an echo of the slicer's string seq_id).
			
 
				+            # The protocol docstring at the top of this file documents the
			
 
				+            # asymmetry: slicer sends `"20000"` (string), printer replies
			
 
				+            # with an int. The hardcoded 3021 mirrors real-firmware-captured
			
 
				+            # value; an earlier audit suggesting we echo the slicer's seq_id
			
 
				+            # was wrong and would have broken slicers that validate the
			
 
				+            # type (int vs string).
			
 
				             response = {
			
 
				                 "login": {
			
 
				                     "bind": "free",
			
--- a/backend/app/services/virtual_printer/certificate.py
+++ b/backend/app/services/virtual_printer/certificate.py
@@ -72,10 +72,59 @@ class CertificateService:
 
				             Tuple of (cert_path, key_path)
			
 
				         """
			
 
				         if self.cert_path.exists() and self.key_path.exists():
			
 
				-            logger.debug("Using existing virtual printer certificates")
			
 
				-            return self.cert_path, self.key_path
			
 
				+            if self._cert_matches_current_ca():
			
 
				+                logger.debug("Using existing virtual printer certificates")
			
 
				+                return self.cert_path, self.key_path
			
 
				+            logger.warning(
			
 
				+                "Existing per-VP certificate's issuer doesn't match the current CA "
			
 
				+                "(likely a CA rotation since the cert was signed). Regenerating "
			
 
				+                "to keep the slicer's imported CA in sync with the served chain."
			
 
				+            )
			
 
				         return self.generate_certificates()
			
 
				 
			
 
				+    def _cert_matches_current_ca(self) -> bool:
			
 
				+        """Check whether the on-disk per-VP cert was signed by the current CA.
			
 
				+
			
 
				+        Slicers that import the shared CA validate the per-VP cert against it.
			
 
				+        If the CA has been rotated since the per-VP cert was signed, the chain
			
 
				+        is broken even though both files exist on disk. ``ensure_certificates``
			
 
				+        uses this to decide whether to regenerate.
			
 
				+
			
 
				+        Uses real signature verification — Bambuddy's auto-generated CAs all
			
 
				+        share the same Subject DN ("Virtual Printer CA"), so a DN-only compare
			
 
				+        would incorrectly return True even after rotation.
			
 
				+        """
			
 
				+        try:
			
 
				+            if not self.ca_cert_path.exists():
			
 
				+                # No CA yet — let generate_certificates create one and the
			
 
				+                # matching per-VP chain.
			
 
				+                return False
			
 
				+            cert_pem = self.cert_path.read_bytes()
			
 
				+            cert = x509.load_pem_x509_certificate(cert_pem)
			
 
				+            ca_pem = self.ca_cert_path.read_bytes()
			
 
				+            ca_cert = x509.load_pem_x509_certificate(ca_pem)
			
 
				+            from cryptography.exceptions import InvalidSignature
			
 
				+            from cryptography.hazmat.primitives.asymmetric import padding
			
 
				+
			
 
				+            try:
			
 
				+                ca_cert.public_key().verify(
			
 
				+                    cert.signature,
			
 
				+                    cert.tbs_certificate_bytes,
			
 
				+                    padding.PKCS1v15(),
			
 
				+                    cert.signature_hash_algorithm,
			
 
				+                )
			
 
				+                return True
			
 
				+            except InvalidSignature:
			
 
				+                return False
			
 
				+        except (OSError, ValueError) as e:
			
 
				+            logger.debug("CA-match probe failed for %s: %s", self.cert_path, e)
			
 
				+            return False
			
 
				+        except Exception as e:
			
 
				+            # Any unexpected exception during verification → treat as mismatch
			
 
				+            # and regenerate. Safer than reusing a cert we can't validate.
			
 
				+            logger.debug("CA-match verification failed for %s: %s", self.cert_path, e)
			
 
				+            return False
			
 
				+
			
 
				     def _load_existing_ca(self) -> tuple[rsa.RSAPrivateKey, x509.Certificate] | None:
			
 
				         """Try to load existing CA certificate and key.
			
 
				 
			
@@ -123,8 +172,13 @@ class CertificateService:
 
				         # Generate new CA
			
 
				         ca_key, ca_cert = self._generate_ca_certificate()
			
 
				 
			
 
				-        # Save CA certificate and key
			
 
				-        self.cert_dir.mkdir(parents=True, exist_ok=True)
			
 
				+        # Save CA certificate and key. ``ca_key_path`` and ``ca_cert_path``
			
 
				+        # resolve under ``shared_ca_dir`` (which may differ from cert_dir),
			
 
				+        # so the parent we need to mkdir is the CA file's parent — not
			
 
				+        # cert_dir. Previously this created the per-VP subdirectory while
			
 
				+        # the writes targeted the parent CA dir, which works only because
			
 
				+        # the manager pre-creates both — the method itself was latent.
			
 
				+        self.ca_key_path.parent.mkdir(parents=True, exist_ok=True)
			
 
				         self.ca_key_path.write_bytes(
			
 
				             ca_key.private_bytes(
			
 
				                 encoding=serialization.Encoding.PEM,
			
--- a/backend/app/services/virtual_printer/diagnostic.py
+++ b/backend/app/services/virtual_printer/diagnostic.py
@@ -26,6 +26,7 @@ logger = logging.getLogger(__name__)
 
				 PORT_FTPS = 990  # implicit FTPS — slicer file upload
			
 
				 PORT_MQTT = 8883  # MQTT over TLS — control + status
			
 
				 PORT_BIND = 3002  # bind/detect (TLS) — slicer discovery handshake
			
 
				+PORT_BIND_PLAIN = 3000  # bind/detect (plain) — legacy / some slicer models
			
 
				 
			
 
				 _PORT_PROBE_TIMEOUT = 2.0
			
 
				 
			
@@ -134,14 +135,26 @@ async def run_vp_diagnostic(vp: VirtualPrinter, instance) -> VPDiagnosticResult:
 
				         )
			
 
				         checks.append(DiagnosticCheck(id="port_bind", status="skip", params={"port": PORT_BIND}))
			
 
				     else:
			
 
				-        ftp_ok, mqtt_ok, bind_ok = await asyncio.gather(
			
 
				+        # The non-proxy bind server listens on BOTH 3000 (plain) and 3002
			
 
				+        # (TLS) per bind_server.py BIND_PORTS — slicers pick either path.
			
 
				+        # Probing only 3002 missed half-dead VPs where one listener failed
			
 
				+        # to start and the other succeeded; report port_bind as pass only
			
 
				+        # when both probes succeed.
			
 
				+        ftp_ok, mqtt_ok, bind_tls_ok, bind_plain_ok = await asyncio.gather(
			
 
				             _check_port(bind_ip, PORT_FTPS),
			
 
				             _check_port(bind_ip, PORT_MQTT),
			
 
				             _check_port(bind_ip, PORT_BIND),
			
 
				+            _check_port(bind_ip, PORT_BIND_PLAIN),
			
 
				         )
			
 
				         checks.append(DiagnosticCheck(id="port_ftps", status="pass" if ftp_ok else "fail", params={"port": PORT_FTPS}))
			
 
				         checks.append(DiagnosticCheck(id="port_mqtt", status="pass" if mqtt_ok else "fail", params={"port": PORT_MQTT}))
			
 
				-        checks.append(DiagnosticCheck(id="port_bind", status="pass" if bind_ok else "fail", params={"port": PORT_BIND}))
			
 
				+        checks.append(
			
 
				+            DiagnosticCheck(
			
 
				+                id="port_bind",
			
 
				+                status="pass" if (bind_tls_ok and bind_plain_ok) else "fail",
			
 
				+                params={"port": PORT_BIND, "port_plain": PORT_BIND_PLAIN},
			
 
				+            )
			
 
				+        )
			
 
				 
			
 
				     # --- TLS certificate ---
			
 
				     # When running, the cert chain must exist on disk for the slicer's TLS
			
--- a/backend/app/services/virtual_printer/ftp_server.py
+++ b/backend/app/services/virtual_printer/ftp_server.py
@@ -8,6 +8,7 @@ immediately upon connection, before any FTP commands are exchanged.
 
				 """
			
 
				 
			
 
				 import asyncio
			
 
				+import hmac
			
 
				 import logging
			
 
				 import os
			
 
				 import random
			
@@ -24,6 +25,14 @@ logger = logging.getLogger(__name__)
 
				 # Requires CAP_NET_BIND_SERVICE or root.
			
 
				 FTP_PORT = 990
			
 
				 
			
 
				+# Hard cap on a single upload. 4 GiB covers the largest realistic
			
 
				+# multi-plate .gcode.3mf and rejects runaway / malicious clients before
			
 
				+# they can exhaust the disk or OOM the host. STOR still buffers the
			
 
				+# whole file in memory before write_bytes — peak RSS ~2x file size during
			
 
				+# the b''.join — so the cap also caps that peak. If real users hit it
			
 
				+# with a legitimate file, raise here.
			
 
				+MAX_UPLOAD_BYTES = 4 * 1024 * 1024 * 1024  # 4 GiB
			
 
				+
			
 
				 
			
 
				 class FTPSession:
			
 
				     """Handles a single FTP client session."""
			
@@ -162,7 +171,10 @@ class FTPSession:
 
				     async def cmd_PASS(self, arg: str) -> None:
			
 
				         """Handle PASS command."""
			
 
				         if self.username and self.username.lower() == "bblp":
			
 
				-            if arg == self.access_code:
			
 
				+            # ``hmac.compare_digest`` is constant-time — keeps the auth check
			
 
				+            # from leaking the access code via response timing under network
			
 
				+            # jitter. LAN-only threat is marginal; this is the standard fix.
			
 
				+            if hmac.compare_digest(arg, self.access_code):
			
 
				                 self.authenticated = True
			
 
				                 await self.send(230, "Login successful")
			
 
				                 logger.info("%sFTP login from %s", self._log_prefix, self.remote_ip)
			
@@ -380,7 +392,19 @@ class FTPSession:
 
				             await asyncio.sleep(0.1)
			
 
				 
			
 
				     async def cmd_STOR(self, arg: str) -> None:
			
 
				-        """Handle STOR command - receive file upload."""
			
 
				+        """Handle STOR command - receive file upload.
			
 
				+
			
 
				+        Streams each chunk directly to disk inside the receive loop instead
			
 
				+        of buffering the whole file in a ``list[bytes]`` and joining at the
			
 
				+        end. Wire protocol unchanged — same 150/226/426 sequence, same
			
 
				+        single-write target path (no ``.part`` or atomic rename), no new
			
 
				+        verbs, no concurrency guard. The visible behaviour difference is
			
 
				+        that the destination file grows progressively during upload rather
			
 
				+        than appearing all-at-once on completion; slicers don't LIST during
			
 
				+        STOR, so this isn't observable. Peak RSS for a multi-GB upload
			
 
				+        drops from ~2× file size to one chunk (64 KiB).
			
 
				+        ``MAX_UPLOAD_BYTES`` cap kept — purely server-internal DoS guard.
			
 
				+        """
			
 
				         if not self.authenticated:
			
 
				             await self.send(530, "Not logged in")
			
 
				             return
			
@@ -390,7 +414,9 @@ class FTPSession:
 
				             return
			
 
				 
			
 
				         filename = Path(arg).name  # Sanitize filename
			
 
				-        file_path = self.upload_dir / filename
			
 
				+        file_path = (
			
 
				+            self.upload_dir / filename
			
 
				+        )  # SEC-PATH-OK: filename = Path(arg).name strips every path component above
			
 
				 
			
 
				         logger.info("FTP receiving file: %s from %s", filename, self.remote_ip)
			
 
				 
			
@@ -410,22 +436,23 @@ class FTPSession:
 
				             await self._close_data_connection()
			
 
				             return
			
 
				 
			
 
				-        # Receive data
			
 
				-        data_content: list[bytes] = []
			
 
				+        # Receive + stream to disk
			
 
				         total_received = 0
			
 
				+        write_failed: Exception | None = None
			
 
				         try:
			
 
				-            while True:
			
 
				-                chunk = await asyncio.wait_for(self._data_reader.read(65536), timeout=60)
			
 
				-                if not chunk:
			
 
				-                    break
			
 
				-                data_content.append(chunk)
			
 
				-                total_received += len(chunk)
			
 
				-                logger.debug("FTP received chunk: %s bytes (total: %s)", len(chunk), total_received)
			
 
				+            with file_path.open("wb") as f:
			
 
				+                while True:
			
 
				+                    chunk = await asyncio.wait_for(self._data_reader.read(65536), timeout=60)
			
 
				+                    if not chunk:
			
 
				+                        break
			
 
				+                    total_received += len(chunk)
			
 
				+                    if total_received > MAX_UPLOAD_BYTES:
			
 
				+                        raise OSError(f"upload exceeded size cap ({total_received} > {MAX_UPLOAD_BYTES} bytes)")
			
 
				+                    f.write(chunk)
			
 
				+                    logger.debug("FTP received chunk: %s bytes (total: %s)", len(chunk), total_received)
			
 
				         except TimeoutError:
			
 
				             logger.error("FTP data transfer timeout after %s bytes for %s", total_received, filename)
			
 
				-            await self.send(426, "Transfer timeout")
			
 
				-            await self._close_data_connection()
			
 
				-            return
			
 
				+            write_failed = TimeoutError("Transfer timeout")
			
 
				         except Exception as e:
			
 
				             logger.error(
			
 
				                 "FTP data transfer error after %s bytes for %s: %s(%s)",
			
@@ -434,32 +461,32 @@ class FTPSession:
 
				                 type(e).__name__,
			
 
				                 e,
			
 
				             )
			
 
				-            await self.send(426, f"Transfer failed: {e}")
			
 
				-            await self._close_data_connection()
			
 
				-            return
			
 
				+            write_failed = e
			
 
				 
			
 
				         # Close data connection
			
 
				         await self._close_data_connection()
			
 
				 
			
 
				-        # Write file
			
 
				-        try:
			
 
				-            total_size = sum(len(c) for c in data_content)
			
 
				-            file_path.write_bytes(b"".join(data_content))
			
 
				-            logger.info("FTP saved file: %s (%s bytes)", file_path, total_size)
			
 
				-            await self.send(226, "Transfer complete")
			
 
				+        if write_failed is not None:
			
 
				+            # Drop the partial file so it doesn't masquerade as a complete
			
 
				+            # upload — buffer-then-write never had a partial-file footprint.
			
 
				+            try:
			
 
				+                file_path.unlink(missing_ok=True)
			
 
				+            except OSError:
			
 
				+                pass
			
 
				+            await self.send(426, f"Transfer failed: {write_failed}")
			
 
				+            return
			
 
				 
			
 
				-            # Notify callback
			
 
				-            if self.on_file_received:
			
 
				-                try:
			
 
				-                    result = self.on_file_received(file_path, self.remote_ip)
			
 
				-                    if asyncio.iscoroutine(result):
			
 
				-                        await result
			
 
				-                except Exception as e:
			
 
				-                    logger.error("File received callback error: %s", e)
			
 
				+        # Confirm + notify
			
 
				+        logger.info("FTP saved file: %s (%s bytes)", file_path, total_received)
			
 
				+        await self.send(226, "Transfer complete")
			
 
				 
			
 
				-        except Exception as e:
			
 
				-            logger.error("Failed to save file %s: %s", file_path, e)
			
 
				-            await self.send(550, "Failed to save file")
			
 
				+        if self.on_file_received:
			
 
				+            try:
			
 
				+                result = self.on_file_received(file_path, self.remote_ip)
			
 
				+                if asyncio.iscoroutine(result):
			
 
				+                    await result
			
 
				+            except Exception as e:
			
 
				+                logger.error("File received callback error: %s", e)
			
 
				 
			
 
				     async def cmd_SIZE(self, arg: str) -> None:
			
 
				         """Handle SIZE command."""
			
@@ -514,7 +541,18 @@ class FTPSession:
 
				         await self.send(257, f'"{arg}" directory created')
			
 
				 
			
 
				     async def cmd_LIST(self, arg: str) -> None:
			
 
				-        """Handle LIST command - list directory contents."""
			
 
				+        """Handle LIST command - list directory contents.
			
 
				+
			
 
				+        Intentionally answers 150 + 226 without opening the passive data
			
 
				+        channel. Bambuddy is an upload-only VP — no slicer in capture logs
			
 
				+        actually issues LIST during the project_file flow, so the
			
 
				+        no-data-conn ack is what every observed slicer accepts. A previous
			
 
				+        audit recommended opening + closing the data conn for protocol
			
 
				+        purity; reverted because (a) the bug was theoretical, (b) slicer
			
 
				+        compatibility matters more than RFC purity here, and (c) adding
			
 
				+        NLST/MLSD alongside changes the "supported verbs" surface in a way
			
 
				+        we cannot regression-test without every supported slicer build.
			
 
				+        """
			
 
				         if not self.authenticated:
			
 
				             await self.send(530, "Not logged in")
			
 
				             return
			
@@ -526,8 +564,14 @@ class FTPSession:
 
				 class VirtualPrinterFTPServer:
			
 
				     """Implicit FTPS server that accepts uploads from slicers."""
			
 
				 
			
 
				+    # Passive-mode data port range. Widened from 50000-50100 (101 ports) to
			
 
				+    # 50000-51000 (1001 ports) so concurrent transfers across multiple VPs
			
 
				+    # — particularly when a VP falls back to bind 0.0.0.0 (manager.py picks
			
 
				+    # this when bind_ip is unset) — don't collide. With 101 ports and 10
			
 
				+    # random pick attempts per session, birthday-style collisions hit
			
 
				+    # under load; 1001 ports gives multi-VP setups headroom.
			
 
				     PASSIVE_PORT_MIN = 50000
			
 
				-    PASSIVE_PORT_MAX = 50100
			
 
				+    PASSIVE_PORT_MAX = 51000
			
 
				 
			
 
				     def __init__(
			
 
				         self,
			
@@ -562,6 +606,12 @@ class VirtualPrinterFTPServer:
 
				         self.vp_name = vp_name
			
 
				         self._server: asyncio.Server | None = None
			
 
				         self._running = False
			
 
				+        # Set after the socket is bound and the server is accepting connections,
			
 
				+        # so VirtualPrinterInstance.start_server can wait for readiness before
			
 
				+        # reporting is_running=True. Without this, a caller racing the start
			
 
				+        # could probe the port and see "connection refused" while is_running
			
 
				+        # already says yes.
			
 
				+        self.ready = asyncio.Event()
			
 
				         self._ssl_context: ssl.SSLContext | None = None
			
 
				         self._active_sessions: list[asyncio.Task] = []
			
 
				         # Override PASV response IP for Docker bridge mode / NAT environments
			
@@ -579,14 +629,33 @@ class VirtualPrinterFTPServer:
 
				         cache_dir = self.upload_dir / "cache"
			
 
				         cache_dir.mkdir(exist_ok=True)
			
 
				 
			
 
				-        # Create SSL context for implicit FTPS (TLS from byte 0)
			
 
				+        # Create SSL context for implicit FTPS (TLS from byte 0).
			
 
				+        # Pinned to TLS 1.2 only. Allowing 1.3 broke BambuStudio mid-upload
			
 
				+        # in the field (session_reused=True on data channel via PSK + libcurl
			
 
				+        # CURLE_PARTIAL_FILE / RST after ~80 KiB; "server did not report OK,
			
 
				+        # got 426"). Real Bambu printers also serve their FTPS at 1.2 only,
			
 
				+        # and the slicer expects to match that. A future slicer drop of 1.2
			
 
				+        # is a problem to solve when it actually happens; until then 1.2 is
			
 
				+        # mandatory for compat.
			
 
				         self._ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
			
 
				         self._ssl_context.load_cert_chain(str(self.cert_path), str(self.key_path))
			
 
				         self._ssl_context.minimum_version = ssl.TLSVersion.TLSv1_2
			
 
				         self._ssl_context.maximum_version = ssl.TLSVersion.TLSv1_2
			
 
				 
			
 
				-        # Use standard TLS settings for compatibility
			
 
				-        self._ssl_context.set_ciphers("HIGH:!aNULL:!MD5:!RC4")
			
 
				+        # Keep the historical `HIGH:!aNULL:!MD5:!RC4` baseline so the cipher
			
 
				+        # set stays a strict superset of what shipped before (the previous
			
 
				+        # set offered ~58 extra suites — CCM, ARIA, CAMELLIA, DSS variants —
			
 
				+        # that no Bambu slicer is known to pick, but the
			
 
				+        # [[feedback_dont_remove_compat_pinning]] HARD RULE says don't
			
 
				+        # narrow a compat surface without proof). The two explicit additions
			
 
				+        # cover the #1610 case on hardened distros (Fedora / RHEL with
			
 
				+        # `update-crypto-policies`, hardened Alpine builds) where the system
			
 
				+        # policy strips the plain-RSA `AES256-GCM-SHA384` / `AES128-GCM-SHA256`
			
 
				+        # suites from `HIGH` — without them present the slicer's FTPS
			
 
				+        # ClientHello (which mimics the cipher set real Bambu printers offer)
			
 
				+        # finds no overlap and the handshake aborts. Listing them explicitly
			
 
				+        # survives any system policy that strips them from `HIGH`.
			
 
				+        self._ssl_context.set_ciphers("HIGH:AES256-GCM-SHA384:AES128-GCM-SHA256:!aNULL:!MD5:!RC4")
			
 
				 
			
 
				         logger.info("FTP SSL context created with standard settings")
			
 
				 
			
@@ -599,6 +668,7 @@ class VirtualPrinterFTPServer:
 
				                 ssl=self._ssl_context,  # This makes it implicit FTPS!
			
 
				             )
			
 
				             self._running = True
			
 
				+            self.ready.set()
			
 
				 
			
 
				             logger.info("Implicit FTPS server started on port %s", self.port)
			
 
				             logger.info(
			
@@ -657,14 +727,17 @@ class VirtualPrinterFTPServer:
 
				         """Stop the FTPS server."""
			
 
				         logger.info("Stopping FTP server")
			
 
				         self._running = False
			
 
				-
			
 
				-        # Cancel all active sessions first
			
 
				-        for task in self._active_sessions[:]:  # Copy list to avoid modification during iteration
			
 
				+        self.ready.clear()
			
 
				+
			
 
				+        # Cancel all active sessions and AWAIT cancellation. Previously
			
 
				+        # this slept 0.1 s and called it good — a session mid-write,
			
 
				+        # mid-TLS handshake, or holding a 60 s data-read could easily
			
 
				+        # outlive that and then ``_server.close()`` would run while the
			
 
				+        # underlying sockets were still in use.
			
 
				+        for task in self._active_sessions[:]:
			
 
				             task.cancel()
			
 
				-
			
 
				-        # Wait briefly for sessions to clean up
			
 
				         if self._active_sessions:
			
 
				-            await asyncio.sleep(0.1)
			
 
				+            await asyncio.gather(*self._active_sessions, return_exceptions=True)
			
 
				 
			
 
				         self._active_sessions.clear()
			
 
				 
			
--- a/backend/app/services/virtual_printer/manager.py
+++ b/backend/app/services/virtual_printer/manager.py
@@ -12,6 +12,11 @@ from pathlib import Path
 
				 from typing import TYPE_CHECKING
			
 
				 
			
 
				 from backend.app.core.config import settings as app_settings
			
 
				+from backend.app.models.virtual_printer import (
			
 
				+    VP_MODE_ARCHIVE,
			
 
				+    VP_MODE_QUEUE,
			
 
				+    normalize_vp_mode,
			
 
				+)
			
 
				 from backend.app.services.virtual_printer.bind_server import BindServer
			
 
				 from backend.app.services.virtual_printer.certificate import CertificateService
			
 
				 from backend.app.services.virtual_printer.ftp_server import VirtualPrinterFTPServer
			
@@ -47,6 +52,8 @@ VIRTUAL_PRINTER_MODELS = {
 
				     "N1": "A1 Mini",  # A1 Mini
			
 
				     # H2 Series
			
 
				     "O1D": "H2D",  # H2D
			
 
				+    "O1E": "H2D Pro",  # H2D Pro
			
 
				+    "O2D": "H2D Pro",  # H2D Pro
			
 
				     "O1C": "H2C",  # H2C
			
 
				     "O1C2": "H2C",  # H2C (dual nozzle variant)
			
 
				     "O1S": "H2S",  # H2S
			
@@ -77,6 +84,8 @@ MODEL_SERIAL_PREFIXES = {
 
				     "N1": "03000A",  # A1 Mini
			
 
				     # H2 Series
			
 
				     "O1D": "09400A",  # H2D
			
 
				+    "O1E": "09400A",  # H2D Pro (same prefix family as H2D)
			
 
				+    "O2D": "09400A",  # H2D Pro
			
 
				     "O1C": "09400A",  # H2C
			
 
				     "O1C2": "09400A",  # H2C (dual nozzle variant)
			
 
				     "O1S": "09400A",  # H2S
			
@@ -88,6 +97,14 @@ DISPLAY_NAME_TO_MODEL_CODE = {v: k for k, v in VIRTUAL_PRINTER_MODELS.items()}
 
				 # Default model
			
 
				 DEFAULT_VIRTUAL_PRINTER_MODEL = "BL-P001"  # X1C
			
 
				 
			
 
				+# Bound on per-instance ``_slicer_print_options`` cache size. The slicer's
			
 
				+# project_file MQTT command stashes one dict per filename; the
			
 
				+# corresponding ``_add_to_print_queue`` pop only fires when the file
			
 
				+# upload completes. Failed / cancelled / non-3MF uploads orphan their
			
 
				+# stash. The bound triggers FIFO eviction in ``on_print_command`` once
			
 
				+# the dict fills, so a long-running VP can't leak unbounded state.
			
 
				+_SLICER_OPTIONS_CACHE_LIMIT = 128
			
 
				+
			
 
				 
			
 
				 def _get_serial_for_model(model: str, serial_suffix: str) -> str:
			
 
				     """Get serial number for the given model and suffix."""
			
@@ -125,7 +142,11 @@ class VirtualPrinterInstance:
 
				     ):
			
 
				         self.id = vp_id
			
 
				         self.name = name
			
 
				-        self.mode = mode
			
 
				+        # Normalize on construction so the rest of the code only compares
			
 
				+        # canonical values, even when a legacy DB row hasn't been migrated
			
 
				+        # yet (e.g. fresh-from-disk during the boot window before the
			
 
				+        # one-shot migration in `core/database.py` has executed).
			
 
				+        self.mode = normalize_vp_mode(mode) or VP_MODE_ARCHIVE
			
 
				         self.model = model
			
 
				         self.access_code = access_code
			
 
				         self.serial_suffix = serial_suffix
			
@@ -222,9 +243,14 @@ class VirtualPrinterInstance:
 
				 
			
 
				         self._pending_files[file_path.name] = file_path
			
 
				 
			
 
				-        if self.mode == "immediate":
			
 
				+        # Accept both canonical (`archive`/`queue`) and legacy
			
 
				+        # (`immediate`/`print_queue`) wire values so a stale row that hasn't
			
 
				+        # been migrated yet still dispatches correctly. Migration in
			
 
				+        # `core/database.py` rewrites existing rows once at boot.
			
 
				+        mode = normalize_vp_mode(self.mode)
			
 
				+        if mode == VP_MODE_ARCHIVE:
			
 
				             await self._archive_file(file_path, source_ip)
			
 
				-        elif self.mode == "print_queue":
			
 
				+        elif mode == VP_MODE_QUEUE:
			
 
				             await self._add_to_print_queue(file_path, source_ip)
			
 
				         else:
			
 
				             await self._queue_file(file_path, source_ip)
			
@@ -241,6 +267,12 @@ class VirtualPrinterInstance:
 
				         # against the same field during the upload window.
			
 
				         if self._mqtt and file_path.suffix.lower() == ".3mf":
			
 
				             self._mqtt.set_gcode_state("FINISH", filename=file_path.name, prepare_percent="100")
			
 
				+            # FINISH is the terminal state for the upload cycle per #1280
			
 
				+            # (commit 0d6171dc). The Print-flow slicer's in-flight-job lock
			
 
				+            # releases on FINISH; resetting to IDLE 2 s later would re-confuse
			
 
				+            # the slicer that just unwedged. Earlier audit suggesting the
			
 
				+            # IDLE reset was wrong — staying at FINISH is the designed
			
 
				+            # behaviour. The next upload's PREPARE→FINISH cycle starts fresh.
			
 
				 
			
 
				     async def on_print_command(self, filename: str, data: dict) -> None:
			
 
				         """Handle print command from MQTT.
			
@@ -249,14 +281,27 @@ class VirtualPrinterInstance:
 
				         `flow_cali`, `vibration_cali`, `layer_inspect`, `use_ams`) so the
			
 
				         VP-queue path can inherit them when adding the item to the queue,
			
 
				         rather than falling back to the global default settings (#1403).
			
 
				-        Only queue mode consumes the capture; immediate / review / proxy
			
 
				+        Only queue mode consumes the capture; archive / review / proxy
			
 
				         modes ignore the print command, so we skip the stash there to keep
			
 
				         the dict from accumulating one entry per print over the VP's
			
 
				         uptime.
			
 
				         """
			
 
				         logger.info("[VP %s] Print command for: %s", self.name, filename)
			
 
				-        if self.mode != "print_queue":
			
 
				+        if normalize_vp_mode(self.mode) != VP_MODE_QUEUE:
			
 
				             return
			
 
				+        # Drop the oldest stash if the cache is growing — happens when the
			
 
				+        # slicer sends project_file for a filename whose FTP upload was
			
 
				+        # rejected / cancelled / non-3MF, so _add_to_print_queue's pop
			
 
				+        # never fires. With no bound, a long-running VP accumulates one
			
 
				+        # dict per such mismatch.
			
 
				+        if len(self._slicer_print_options) >= _SLICER_OPTIONS_CACHE_LIMIT:
			
 
				+            try:
			
 
				+                stale_key = next(iter(self._slicer_print_options))
			
 
				+                self._slicer_print_options.pop(stale_key, None)
			
 
				+                self._slicer_print_options_events.pop(stale_key, None)
			
 
				+                logger.debug("[VP %s] Evicted stale slicer options for %s", self.name, stale_key)
			
 
				+            except StopIteration:
			
 
				+                pass
			
 
				         self._slicer_print_options[filename] = dict(data)
			
 
				         event = self._slicer_print_options_events.get(filename)
			
 
				         if event:
			
@@ -277,6 +322,7 @@ class VirtualPrinterInstance:
 
				                 pass
			
 
				             return
			
 
				 
			
 
				+        archived = False
			
 
				         try:
			
 
				             from backend.app.api.routes.settings import get_setting
			
 
				             from backend.app.services.archive import ArchiveService
			
@@ -298,15 +344,29 @@ class VirtualPrinterInstance:
 
				                 if archive:
			
 
				                     logger.info("[VP %s] Archived: %s - %s", self.name, archive.id, archive.print_name)
			
 
				                     await self._broadcast_archive_created(archive)
			
 
				-                    try:
			
 
				-                        file_path.unlink()
			
 
				-                    except OSError:
			
 
				-                        pass
			
 
				-                    self._pending_files.pop(file_path.name, None)
			
 
				+                    archived = True
			
 
				                 else:
			
 
				                     logger.error("Failed to archive file: %s", file_path.name)
			
 
				         except Exception as e:
			
 
				             logger.error("Error archiving file: %s", e)
			
 
				+        finally:
			
 
				+            # Always release the in-flight marker and delete the temp file —
			
 
				+            # previously the failure paths only logged and the next upload of
			
 
				+            # the same name was silently rejected with "already uploading",
			
 
				+            # the upload_dir filled up indefinitely, and the slicer received
			
 
				+            # a clean 226 even though no archive existed (#audit-R2-1).
			
 
				+            self._pending_files.pop(file_path.name, None)
			
 
				+            if archived:
			
 
				+                try:
			
 
				+                    file_path.unlink()
			
 
				+                except OSError:
			
 
				+                    pass
			
 
				+            else:
			
 
				+                # Drop the failed temp file so it doesn't accumulate.
			
 
				+                try:
			
 
				+                    file_path.unlink(missing_ok=True)
			
 
				+                except OSError:
			
 
				+                    pass
			
 
				 
			
 
				     async def _queue_file(self, file_path: Path, source_ip: str) -> None:
			
 
				         """Queue file for user review."""
			
@@ -354,9 +414,19 @@ class VirtualPrinterInstance:
 
				                 db.add(pending)
			
 
				                 await db.commit()
			
 
				                 logger.info("[VP %s] Queued: %s - %s", self.name, pending.id, file_path.name)
			
 
				-                self._pending_files.pop(file_path.name, None)
			
 
				         except Exception as e:
			
 
				             logger.error("Error queueing file: %s", e)
			
 
				+            # Queue insert failed — drop the temp file so it doesn't
			
 
				+            # accumulate. The file is unreachable without the DB row.
			
 
				+            try:
			
 
				+                file_path.unlink(missing_ok=True)
			
 
				+            except OSError:
			
 
				+                pass
			
 
				+        finally:
			
 
				+            # Always release the in-flight marker so concurrent uploads
			
 
				+            # with the same filename aren't spuriously rejected after
			
 
				+            # a queue failure.
			
 
				+            self._pending_files.pop(file_path.name, None)
			
 
				 
			
 
				     async def _add_to_print_queue(self, file_path: Path, source_ip: str) -> None:
			
 
				         """Archive file and add to print queue, assigned to target printer or model."""
			
@@ -492,12 +562,33 @@ class VirtualPrinterInstance:
 
				                             if overrides:
			
 
				                                 filament_overrides_json = json.dumps(overrides)
			
 
				 
			
 
				+                    # Pick the next free position the same way the manual
			
 
				+                    # /print-queue/ POST does — previously hardcoded to 1,
			
 
				+                    # which created duplicate position=1 rows on every
			
 
				+                    # VP upload and made queue execution order
			
 
				+                    # non-deterministic for any non-empty queue.
			
 
				+                    from sqlalchemy import func, select as _sql_select
			
 
				+
			
 
				+                    queue_scope = _sql_select(func.max(PrintQueueItem.position)).where(
			
 
				+                        PrintQueueItem.status == "pending"
			
 
				+                    )
			
 
				+                    if self.target_printer_id is not None:
			
 
				+                        queue_scope = queue_scope.where(PrintQueueItem.printer_id == self.target_printer_id)
			
 
				+                    else:
			
 
				+                        queue_scope = queue_scope.where(PrintQueueItem.printer_id.is_(None))
			
 
				+                    try:
			
 
				+                        max_pos_raw = (await db.execute(queue_scope)).scalar()
			
 
				+                        max_pos = int(max_pos_raw) if max_pos_raw is not None else 0
			
 
				+                    except (TypeError, ValueError):
			
 
				+                        max_pos = 0
			
 
				+                    next_position = max_pos + 1
			
 
				+
			
 
				                     queue_item = PrintQueueItem(
			
 
				                         printer_id=self.target_printer_id,
			
 
				                         target_model=target_model,
			
 
				                         archive_id=archive.id,
			
 
				                         plate_id=plate_id,
			
 
				-                        position=1,
			
 
				+                        position=next_position,
			
 
				                         status="pending",
			
 
				                         manual_start=not self.auto_dispatch,
			
 
				                         required_filament_types=required_filament_types_json,
			
@@ -512,15 +603,20 @@ class VirtualPrinterInstance:
 
				                     await db.commit()
			
 
				                     logger.info("[VP %s] Added to queue: %s", self.name, queue_item.id)
			
 
				                     await self._broadcast_archive_created(archive)
			
 
				-                    try:
			
 
				-                        file_path.unlink()
			
 
				-                    except OSError:
			
 
				-                        pass
			
 
				-                    self._pending_files.pop(file_path.name, None)
			
 
				                 else:
			
 
				                     logger.error("Failed to archive file: %s", file_path.name)
			
 
				         except Exception as e:
			
 
				             logger.error("Error adding to print queue: %s", e)
			
 
				+        finally:
			
 
				+            # Always release the marker and clean the temp file. Without this
			
 
				+            # the same-name STOR guard would block the next upload and the
			
 
				+            # upload_dir would accumulate failed temp files forever
			
 
				+            # (#audit-R2-1).
			
 
				+            self._pending_files.pop(file_path.name, None)
			
 
				+            try:
			
 
				+                file_path.unlink(missing_ok=True)
			
 
				+            except OSError:
			
 
				+                pass
			
 
				 
			
 
				     async def _broadcast_archive_created(self, archive) -> None:
			
 
				         """Notify connected clients that a new archive exists.
			
@@ -560,7 +656,12 @@ class VirtualPrinterInstance:
 
				                         for meta in plate.findall("metadata"):
			
 
				                             if meta.get("key") == "index" and meta.get("value"):
			
 
				                                 return int(meta.get("value"))
			
 
				-        except Exception:
			
 
				+        except Exception as e:
			
 
				+            # Malformed / missing slice_info.config — fall through to None.
			
 
				+            # Logged at debug so a non-3MF or unconventional 3MF doesn't
			
 
				+            # spam production logs; a debug trail exists for support
			
 
				+            # bundles when wrong-plate dispatches are reported.
			
 
				+            logger.debug("[VP] _extract_plate_id failed for %s: %s", file_path.name, e)
			
 
				             return None
			
 
				         return None
			
 
				 
			
@@ -682,8 +783,11 @@ class VirtualPrinterInstance:
 
				             )
			
 
				         )
			
 
				 
			
 
				-        # SSDP server — advertise_addr is the Tailscale FQDN when available,
			
 
				-        # otherwise the bind/remote IP (existing behaviour)
			
 
				+        # SSDP server — advertise_addr is the remote_interface_ip (Tailscale
			
 
				+        # IP, when chosen from the bind_ip dropdown) or the bind_ip. SSDP
			
 
				+        # Location accepts IPs only; FQDNs go in through bind_ip selection
			
 
				+        # at the printer-IP level and resolve before reaching the SSDP
			
 
				+        # advertisement.
			
 
				         self._ssdp = VirtualPrinterSSDPServer(
			
 
				             name=self.name,
			
 
				             serial=self.serial,
			
@@ -698,6 +802,32 @@ class VirtualPrinterInstance:
 
				             )
			
 
				         )
			
 
				 
			
 
				+        # Wait briefly for every child service to actually finish binding its
			
 
				+        # socket so ``is_running`` doesn't lie. Without this barrier a caller
			
 
				+        # racing the start (e.g. the diagnostic route) would see is_running=True
			
 
				+        # while ports were still in the gap between task creation and the
			
 
				+        # ``asyncio.start_server`` returning. Bounded timeout — if a child
			
 
				+        # hangs we log it and move on; the existing task tracking still
			
 
				+        # catches the failure on the next iteration.
			
 
				+        ready_targets = [
			
 
				+            ("FTP", self._ftp.ready),
			
 
				+            ("MQTT", self._mqtt.ready),
			
 
				+            ("Bind", self._bind.ready),
			
 
				+            ("SSDP", self._ssdp.ready),
			
 
				+        ]
			
 
				+        try:
			
 
				+            await asyncio.wait_for(
			
 
				+                asyncio.gather(*(e.wait() for _, e in ready_targets)),
			
 
				+                timeout=5.0,
			
 
				+            )
			
 
				+        except TimeoutError:
			
 
				+            not_ready = [name for name, e in ready_targets if not e.is_set()]
			
 
				+            logger.warning(
			
 
				+                "[VP %s] Sub-service(s) didn't bind within 5s: %s — continuing anyway",
			
 
				+                self.name,
			
 
				+                ", ".join(not_ready) or "(none)",
			
 
				+            )
			
 
				+
			
 
				         logger.info("[VP %s] Server-mode services started on %s", self.name, bind_addr)
			
 
				 
			
 
				     async def stop_server(self) -> None:
			
@@ -850,6 +980,13 @@ class VirtualPrinterManager:
 
				         self._session_factory: Callable | None = None
			
 
				         self._printer_manager: PrinterManager | None = None
			
 
				         self._instances: dict[int, VirtualPrinterInstance] = {}
			
 
				+        # Serialize sync_from_db so concurrent PUT /vp/{id} calls can't
			
 
				+        # race the start/stop sequence and leave duplicate sub-services
			
 
				+        # bound to the same port. The lock is fine-grained enough that
			
 
				+        # a single VP update completes in well under a second; if the
			
 
				+        # user holds the lock with a long-running start they intended
			
 
				+        # to anyway.
			
 
				+        self._sync_lock = asyncio.Lock()
			
 
				 
			
 
				         # Directories
			
 
				         self._base_dir = app_settings.base_dir / "virtual_printer"
			
@@ -895,11 +1032,22 @@ class VirtualPrinterManager:
 
				         return len(self._instances) > 0
			
 
				 
			
 
				     async def sync_from_db(self) -> None:
			
 
				-        """Load all VPs from DB, reconcile running state."""
			
 
				+        """Load all VPs from DB, reconcile running state.
			
 
				+
			
 
				+        Serialised by ``self._sync_lock`` — concurrent PUT /vp/{id} routes
			
 
				+        all call into this method; without the lock the start / stop
			
 
				+        sequence races and can leave duplicate sub-services bound to the
			
 
				+        same port or orphan still-running tasks.
			
 
				+        """
			
 
				         if not self._session_factory:
			
 
				             logger.warning("Cannot sync virtual printers: no session factory")
			
 
				             return
			
 
				 
			
 
				+        async with self._sync_lock:
			
 
				+            await self._sync_from_db_locked()
			
 
				+
			
 
				+    async def _sync_from_db_locked(self) -> None:
			
 
				+        """Inner sync body — caller holds ``self._sync_lock``."""
			
 
				         from sqlalchemy import select
			
 
				 
			
 
				         from backend.app.models.printer import Printer
			
@@ -935,14 +1083,39 @@ class VirtualPrinterManager:
 
				             if not instance:
			
 
				                 continue
			
 
				 
			
 
				+            # Proxy mode: detect target printer IP / serial changes from the
			
 
				+            # DB lookup above. Without this branch a DHCP renewal that gives
			
 
				+            # the target printer a new IP would leave the running proxy
			
 
				+            # forwarding to the stale IP until the user manually toggles the
			
 
				+            # VP. The same shape covers a target-side serial change.
			
 
				+            proxy_target_changed = False
			
 
				+            if vp.mode == "proxy":
			
 
				+                fresh = proxy_ips.get(vp.id)
			
 
				+                if fresh is not None:
			
 
				+                    fresh_ip, fresh_serial = fresh
			
 
				+                    if (
			
 
				+                        getattr(instance, "target_printer_ip", None) != fresh_ip
			
 
				+                        or getattr(instance, "target_printer_serial", None) != fresh_serial
			
 
				+                    ):
			
 
				+                        proxy_target_changed = True
			
 
				+
			
 
				+            # Normalize the DB value before comparing — a legacy `immediate`
			
 
				+            # row read before the migration window finishes would otherwise
			
 
				+            # trip the "changed" branch and bounce every VP at boot.
			
 
				+            db_mode = normalize_vp_mode(vp.mode)
			
 
				             changed = (
			
 
				-                instance.mode != vp.mode
			
 
				+                instance.mode != db_mode
			
 
				                 or instance.model != (vp.model or DEFAULT_VIRTUAL_PRINTER_MODEL)
			
 
				                 or instance.access_code != (vp.access_code or "")
			
 
				                 or instance.bind_ip != (vp.bind_ip or "")
			
 
				                 or instance.remote_interface_ip != (vp.remote_interface_ip or "")
			
 
				                 or instance.target_printer_id != vp.target_printer_id
			
 
				                 or instance.auto_dispatch != vp.auto_dispatch
			
 
				+                # Queue-mode behaviour toggle — without it the running
			
 
				+                # instance silently keeps the old value until process
			
 
				+                # restart (#1552 follow-up family).
			
 
				+                or instance.queue_force_color_match != vp.queue_force_color_match
			
 
				+                or proxy_target_changed
			
 
				             )
			
 
				 
			
 
				             if changed:
			
@@ -1065,7 +1238,7 @@ class VirtualPrinterManager:
 
				         return {
			
 
				             "enabled": False,
			
 
				             "running": False,
			
 
				-            "mode": "immediate",
			
 
				+            "mode": VP_MODE_ARCHIVE,
			
 
				             "name": "Bambuddy",
			
 
				             "serial": "",
			
 
				             "model": DEFAULT_VIRTUAL_PRINTER_MODEL,
			
@@ -1077,7 +1250,7 @@ class VirtualPrinterManager:
 
				         self,
			
 
				         enabled: bool,
			
 
				         access_code: str = "",
			
 
				-        mode: str = "immediate",
			
 
				+        mode: str = VP_MODE_ARCHIVE,
			
 
				         model: str = "",
			
 
				         target_printer_ip: str = "",
			
 
				         target_printer_serial: str = "",
			
--- a/backend/app/services/virtual_printer/mqtt_bridge.py
+++ b/backend/app/services/virtual_printer/mqtt_bridge.py
@@ -65,6 +65,20 @@ _SLICER_VISIBLE_STICKY_KEYS: tuple[str, ...] = (
 
				     "net",
			
 
				     "ipcam",
			
 
				     "lights_report",
			
 
				+    # Pre-flight / Prepare-tab fields that BambuStudio reads off cached
			
 
				+    # push_status. Bambu firmware emits them in full pushall but typically
			
 
				+    # OMITS them from 1 Hz incremental updates, so without sticky-preservation
			
 
				+    # the cache drops them after the very next tick and the slicer's
			
 
				+    # "block Send while busy / unknown firmware" branch kicks in. Same shape
			
 
				+    # as #1228 (storage indicators) and #1558 (live-progress fields) —
			
 
				+    # cached-branch field-shape parity, not a new mechanism.
			
 
				+    "upgrade_state",  # Send pre-flight reads dis_state / force_upgrade
			
 
				+    "xcam",  # Prepare-tab reads spaghetti / first-layer / halt sensitivity
			
 
				+    "hw_switch_state",  # Hardware switch state (Prepare tab)
			
 
				+    "nozzle_diameter",
			
 
				+    "nozzle_type",
			
 
				+    "online",  # Module online map (ahb / rfid / version)
			
 
				+    "ams_status",  # AMS overall status; can be ams_status-only incremental
			
 
				 )
			
 
				 
			
 
				 
			
@@ -76,6 +90,33 @@ def _ip_to_uint32_le(ip_str: str) -> int:
 
				     return parts[0] | (parts[1] << 8) | (parts[2] << 16) | (parts[3] << 24)
			
 
				 
			
 
				 
			
 
				+def _resolve_host_interface_for_target(target_ip: str) -> str | None:
			
 
				+    """Pick a host-side IPv4 for `net.info[].ip` when the VP has no dedicated bind IP.
			
 
				+
			
 
				+    Used when `mqtt_server.bind_address` is empty or 0.0.0.0 — the listener
			
 
				+    accepts on every interface but we still need ONE concrete IPv4 to write
			
 
				+    into the rewritten `net.info[].ip` field so the slicer's FTP target
			
 
				+    resolves to Bambuddy rather than the real printer. Returns the IPv4 of
			
 
				+    the host interface that shares a subnet with the printer (best fit
			
 
				+    because the slicer is typically on the same LAN as the printer), or
			
 
				+    None if no interface matches — in which case the bridge leaves
			
 
				+    encoding unarmed and the previous (still-leaky) behaviour stands.
			
 
				+    """
			
 
				+    try:
			
 
				+        from backend.app.services.network_utils import find_interface_for_ip
			
 
				+    except Exception:  # pragma: no cover - import shielding
			
 
				+        return None
			
 
				+    try:
			
 
				+        iface = find_interface_for_ip(target_ip)
			
 
				+    except Exception:
			
 
				+        logger.exception("MQTT bridge: find_interface_for_ip(%s) crashed", target_ip)
			
 
				+        return None
			
 
				+    if not iface:
			
 
				+        return None
			
 
				+    ip = iface.get("ip")
			
 
				+    return ip if isinstance(ip, str) and ip else None
			
 
				+
			
 
				+
			
 
				 def _merge_ams_dict(prev_ams: dict, new_ams: dict) -> dict:
			
 
				     """Merge a new ``ams`` blob from an incremental push onto the previous one.
			
 
				 
			
@@ -241,6 +282,11 @@ class MQTTBridge:
 
				         BambuMQTTClient is destroyed and recreated on PrinterManager.connect_printer
			
 
				         (e.g. printer config update). Without periodic refresh the bridge would lose
			
 
				         fan-out after such a churn until the VP itself restarts.
			
 
				+
			
 
				+        On crash exit, the handler must be unbound — otherwise the registered
			
 
				+        ``_on_printer_raw`` keeps firing on every real-printer message even
			
 
				+        though the bridge is functionally dead (memory leak + behaviour leak
			
 
				+        across VP restart).
			
 
				         """
			
 
				         try:
			
 
				             while not self._stopping:
			
@@ -250,6 +296,9 @@ class MQTTBridge:
 
				             raise
			
 
				         except Exception:
			
 
				             logger.exception("[%s] MQTT bridge refresh loop crashed", self.vp_name)
			
 
				+            # Crash exit — unbind so the orphaned handler stops firing.
			
 
				+            # ``stop()`` won't be invoked because the task completes done-not-cancelled.
			
 
				+            self._unbind_client()
			
 
				 
			
 
				     def _resolve_client(self) -> None:
			
 
				         """Look up the current client for target_printer_id and rebind if it changed."""
			
@@ -260,6 +309,15 @@ class MQTTBridge:
 
				             return
			
 
				 
			
 
				         if current is self._target_client:
			
 
				+            # Same client object — but `ip_address` can fill in *after* the
			
 
				+            # initial bind (e.g. DB row had a stale/empty value until the
			
 
				+            # client's first SSDP-driven IP refresh). The original code only
			
 
				+            # encoded `_target_ip_uint32_le` on client-identity change, so
			
 
				+            # that late-arriving IP was never picked up, the `net.info[*].ip`
			
 
				+            # rewrite stayed disabled, and the cache filled with the real
			
 
				+            # printer IP — #1429. Refresh the encoding every tick so it
			
 
				+            # self-heals once `ip_address` becomes valid.
			
 
				+            self._refresh_ip_encoding()
			
 
				             return
			
 
				 
			
 
				         # Client identity changed — unregister from the old, register on the new.
			
@@ -275,20 +333,7 @@ class MQTTBridge:
 
				 
			
 
				         self._target_client = current
			
 
				         self._target_serial = getattr(current, "serial_number", None)
			
 
				-
			
 
				-        # Cache printer IP and VP bind IP encoded as little-endian uint32, so we
			
 
				-        # can rewrite `net.info[*].ip` in cached push_status. BambuStudio reads
			
 
				-        # that field for the FTP destination IP — without rewriting, the slicer
			
 
				-        # bypasses the VP and FTPs straight to the real printer.
			
 
				-        target_ip = getattr(current, "ip_address", None)
			
 
				-        vp_ip = getattr(self._mqtt_server, "bind_address", None)
			
 
				-        if target_ip and vp_ip and vp_ip not in ("0.0.0.0", "", None):  # nosec B104
			
 
				-            try:
			
 
				-                self._target_ip_uint32_le = _ip_to_uint32_le(target_ip)
			
 
				-                self._vp_ip_uint32_le = _ip_to_uint32_le(vp_ip)
			
 
				-            except ValueError:
			
 
				-                self._target_ip_uint32_le = None
			
 
				-                self._vp_ip_uint32_le = None
			
 
				+        self._refresh_ip_encoding()
			
 
				 
			
 
				         logger.info(
			
 
				             "[%s] MQTT bridge bound to printer %s (serial=%s)",
			
@@ -326,6 +371,110 @@ class MQTTBridge:
 
				         self._target_client = None
			
 
				         self._target_serial = None
			
 
				 
			
 
				+    def _refresh_ip_encoding(self) -> None:
			
 
				+        """(Re-)encode `_target_ip_uint32_le` / `_vp_ip_uint32_le` from current values.
			
 
				+
			
 
				+        Called on every refresh tick, not just on client-identity change, so
			
 
				+        a late-arriving printer IP (or a bind-address change) is picked up
			
 
				+        without restarting the VP. When the encoding becomes valid for the
			
 
				+        first time *after* the cache already received a push with the real
			
 
				+        printer IP, also sweep the existing cache so the slicer's next pull
			
 
				+        sees the rewritten value (#1429). Without this sweep the sticky-key
			
 
				+        preservation keeps the poisoned `net.info[].ip` alive forever.
			
 
				+
			
 
				+        VP bind IP resolution: when `mqtt_server.bind_address` is empty or
			
 
				+        `0.0.0.0` (the default for VPs that were never assigned a dedicated
			
 
				+        bind IP), fall back to auto-resolving the host interface in the same
			
 
				+        subnet as the printer's IP. Without this fallback, the rewrite never
			
 
				+        arms on a default-config flat-LAN install and `net.info[].ip` leaks
			
 
				+        the real printer IP — slicer follows it on Send (#1429 residual).
			
 
				+        """
			
 
				+        client = self._target_client
			
 
				+        if client is None:
			
 
				+            return
			
 
				+
			
 
				+        target_ip = getattr(client, "ip_address", None)
			
 
				+        if not target_ip:
			
 
				+            return
			
 
				+
			
 
				+        vp_ip = getattr(self._mqtt_server, "bind_address", None)
			
 
				+        vp_ip_source = "bind_address"
			
 
				+        if not vp_ip or vp_ip in ("0.0.0.0", ""):  # nosec B104
			
 
				+            resolved = _resolve_host_interface_for_target(target_ip)
			
 
				+            if not resolved:
			
 
				+                return
			
 
				+            vp_ip = resolved
			
 
				+            vp_ip_source = "auto-resolved"
			
 
				+
			
 
				+        try:
			
 
				+            new_target_le = _ip_to_uint32_le(target_ip)
			
 
				+            new_vp_le = _ip_to_uint32_le(vp_ip)
			
 
				+        except ValueError:
			
 
				+            return
			
 
				+
			
 
				+        if new_target_le == self._target_ip_uint32_le and new_vp_le == self._vp_ip_uint32_le:
			
 
				+            return  # No change — nothing to do.
			
 
				+
			
 
				+        # Encoding either became valid for the first time or shifted (DHCP
			
 
				+        # renewal, bind_ip reconfigured, etc.). Update + sweep the cache.
			
 
				+        was_armed = self._target_ip_uint32_le is not None and self._vp_ip_uint32_le is not None
			
 
				+        self._target_ip_uint32_le = new_target_le
			
 
				+        self._vp_ip_uint32_le = new_vp_le
			
 
				+        logger.info(
			
 
				+            "[%s] MQTT bridge IP encoding %s: target=%s vp=%s (%s)",
			
 
				+            self.vp_name,
			
 
				+            "updated" if was_armed else "armed",
			
 
				+            target_ip,
			
 
				+            vp_ip,
			
 
				+            vp_ip_source,
			
 
				+        )
			
 
				+
			
 
				+        cached = self._latest_print_state
			
 
				+        if isinstance(cached, dict):
			
 
				+            n = self._rewrite_net_info_ips(cached)
			
 
				+            if n:
			
 
				+                logger.info(
			
 
				+                    "[%s] MQTT bridge swept %d net.info[].ip entries in cached push",
			
 
				+                    self.vp_name,
			
 
				+                    n,
			
 
				+                )
			
 
				+
			
 
				+    def _rewrite_net_info_ips(self, print_state: dict) -> int:
			
 
				+        """Rewrite every non-zero `net.info[].ip` in `print_state` to the VP bind IP.
			
 
				+
			
 
				+        Returns the number of entries rewritten. Mutates `print_state` in place.
			
 
				+
			
 
				+        Strategy: rewrite ALL entries with a non-zero `ip`, not only those
			
 
				+        matching `_target_ip_uint32_le`. Real printers (X1C, H2D Pro) can
			
 
				+        report multiple active interfaces (WiFi + Ethernet) with different
			
 
				+        IPs — only one matches the IP Bambuddy tracks, but the slicer may
			
 
				+        read any of them. Leaving non-matching entries pointing at real
			
 
				+        printer interfaces leaks an FTP fallback path that bypasses the VP
			
 
				+        (the #1429 / #1302 symptom). Entries with `ip == 0` are placeholders
			
 
				+        for unpopulated interfaces — leave them alone so the slicer's
			
 
				+        "active interface" detection still recognises them as absent.
			
 
				+        """
			
 
				+        if self._vp_ip_uint32_le is None:
			
 
				+            return 0
			
 
				+        net = print_state.get("net")
			
 
				+        if not isinstance(net, dict):
			
 
				+            return 0
			
 
				+        info = net.get("info")
			
 
				+        if not isinstance(info, list):
			
 
				+            return 0
			
 
				+        rewritten = 0
			
 
				+        for entry in info:
			
 
				+            if not isinstance(entry, dict):
			
 
				+                continue
			
 
				+            ip_value = entry.get("ip")
			
 
				+            if not isinstance(ip_value, int) or ip_value == 0:
			
 
				+                continue
			
 
				+            if ip_value == self._vp_ip_uint32_le:
			
 
				+                continue
			
 
				+            entry["ip"] = self._vp_ip_uint32_le
			
 
				+            rewritten += 1
			
 
				+        return rewritten
			
 
				+
			
 
				     def _on_printer_raw(self, topic: str, payload: bytes) -> None:
			
 
				         """Paho-thread callback — cache the latest push_status for synthetic replay.
			
 
				 
			
@@ -374,14 +523,7 @@ class MQTTBridge:
 
				             # (i.e. configure the VP with the same access code as its target).
			
 
				             # Rewrite real printer IP → VP bind IP in `net.info[*].ip` so the
			
 
				             # slicer's FTP destination resolves to the VP, not the real printer.
			
 
				-            if self._target_ip_uint32_le is not None and self._vp_ip_uint32_le is not None:
			
 
				-                net = print_data.get("net")
			
 
				-                if isinstance(net, dict):
			
 
				-                    info = net.get("info")
			
 
				-                    if isinstance(info, list):
			
 
				-                        for entry in info:
			
 
				-                            if isinstance(entry, dict) and entry.get("ip") == self._target_ip_uint32_le:
			
 
				-                                entry["ip"] = self._vp_ip_uint32_le
			
 
				+            self._rewrite_net_info_ips(print_data)
			
 
				             # Defensive deep copy on store so the cache is fully decoupled from
			
 
				             # the freshly-parsed tree and from any reader's reference.
			
 
				             new_state = copy.deepcopy(print_data)
			
@@ -402,7 +544,11 @@ class MQTTBridge:
 
				                 for sticky_key in _SLICER_VISIBLE_STICKY_KEYS:
			
 
				                     if sticky_key not in new_state:
			
 
				                         if sticky_key in prev:
			
 
				-                            new_state[sticky_key] = prev[sticky_key]
			
 
				+                            # Defensive deep copy — without this the carried-over
			
 
				+                            # nested dicts/lists are shared between new_state and
			
 
				+                            # the previous cache, so any in-place mutation later
			
 
				+                            # (current or future code paths) would corrupt both.
			
 
				+                            new_state[sticky_key] = copy.deepcopy(prev[sticky_key])
			
 
				                         continue
			
 
				                     # Key IS in new_state — but firmware sends partial blobs
			
 
				                     # (status-only / tray-targeted) under the same key on
			
--- a/backend/app/services/virtual_printer/mqtt_server.py
+++ b/backend/app/services/virtual_printer/mqtt_server.py
@@ -5,6 +5,8 @@ authenticates with the configured access code, and logs print commands.
 
				 """
			
 
				 
			
 
				 import asyncio
			
 
				+import copy
			
 
				+import hmac
			
 
				 import json
			
 
				 import logging
			
 
				 import ssl
			
@@ -20,6 +22,22 @@ logger = logging.getLogger(__name__)
 
				 # Default MQTT port for Bambu printers (MQTT over TLS)
			
 
				 MQTT_PORT = 8883
			
 
				 
			
 
				+# Per-IP MQTT auth rate-limit. 5 failures within 60 s blocks further attempts
			
 
				+# for the remainder of the window. Bambu printers themselves don't rate-limit,
			
 
				+# but they're not exposed past the LAN edge; Bambuddy's VPs sometimes are
			
 
				+# (Tailscale, port-forwarded), so an 8-char access code without any
			
 
				+# brute-force friction is too weak. The window auto-recovers — no manual
			
 
				+# unblock — so a legitimate user who fat-fingered their access code 5 times
			
 
				+# only waits up to 60 s.
			
 
				+_AUTH_RATE_LIMIT_MAX_ATTEMPTS = 5
			
 
				+_AUTH_RATE_LIMIT_WINDOW_SECONDS = 60.0
			
 
				+
			
 
				+# Pending-request map bound. Each entry maps a slicer command's
			
 
				+# sequence_id to its originating client_id so the bridge response can be
			
 
				+# routed back to just that client. Bounded so a slicer that issues
			
 
				+# commands without ever consuming responses can't leak memory.
			
 
				+_PENDING_REQUEST_MAX_ENTRIES = 256
			
 
				+
			
 
				 # Model code → product_name for version response (must match what slicer expects)
			
 
				 MODEL_PRODUCT_NAMES = {
			
 
				     "BL-P001": "X1 Carbon",
			
@@ -204,6 +222,8 @@ class SimpleMQTTServer:
 
				         self.vp_name = vp_name
			
 
				         self._log_prefix = f"[{vp_name}] " if vp_name else ""
			
 
				         self._running = False
			
 
				+        # Set after the socket is bound — see ftp_server.py for rationale.
			
 
				+        self.ready = asyncio.Event()
			
 
				         self._server = None
			
 
				         self._clients: dict[str, asyncio.StreamWriter] = {}
			
 
				         # Per-client "effective serial" — the serial the slicer actually uses in
			
@@ -228,6 +248,20 @@ class SimpleMQTTServer:
 
				         # synthetic fallback resumes automatically.
			
 
				         self._bridge: MQTTBridge | None = None
			
 
				 
			
 
				+        # Per-source-IP failed-auth tracker for rate-limiting / lockout.
			
 
				+        # Maps IP → list[monotonic timestamp] of recent failures within the
			
 
				+        # window. Pruned on every check so it doesn't grow unbounded.
			
 
				+        self._auth_failures: dict[str, list[float]] = {}
			
 
				+
			
 
				+        # Maps sequence_id → originating client_id for slicer-initiated
			
 
				+        # commands forwarded to the real printer. Used in
			
 
				+        # ``push_raw_to_clients`` to route the printer's response only
			
 
				+        # back to the requesting slicer instead of fanning out to all
			
 
				+        # connected clients (which leaks slicer A's responses to slicer
			
 
				+        # B in multi-slicer setups). FIFO-bounded; if a response never
			
 
				+        # arrives the entry ages out instead of leaking.
			
 
				+        self._pending_requests: dict[str, str] = {}
			
 
				+
			
 
				     async def start(self) -> None:
			
 
				         """Start the MQTT server."""
			
 
				         if self._running:
			
@@ -242,6 +276,14 @@ class SimpleMQTTServer:
 
				         ssl_context.verify_mode = ssl.CERT_NONE
			
 
				         # Allow TLS 1.2 for broader compatibility (some slicers may not support 1.3)
			
 
				         ssl_context.minimum_version = ssl.TLSVersion.TLSv1_2
			
 
				+        # Match real Bambu printer cipher behaviour: include the plain-RSA
			
 
				+        # AES-GCM suites the slicer expects. On hardened distros
			
 
				+        # (Fedora / RHEL with `update-crypto-policies`, hardened Alpine builds)
			
 
				+        # OpenSSL's `DEFAULT` list strips these suites, leaving no overlap
			
 
				+        # with the slicer's MQTT-over-TLS ClientHello — handshake fails
			
 
				+        # immediately and the slicer reports a connect error before any MQTT
			
 
				+        # CONNECT can be sent (#1610 audit). Same shape as the #620 fix.
			
 
				+        ssl_context.set_ciphers("DEFAULT:AES256-GCM-SHA384:AES128-GCM-SHA256")
			
 
				         # Disable hostname checking
			
 
				         ssl_context.check_hostname = False
			
 
				 
			
@@ -287,6 +329,7 @@ class SimpleMQTTServer:
 
				                 self.port,
			
 
				                 ssl=ssl_context,
			
 
				             )
			
 
				+            self.ready.set()
			
 
				 
			
 
				             logger.info("Simple MQTT server listening on port %s", self.port)
			
 
				 
			
@@ -312,6 +355,7 @@ class SimpleMQTTServer:
 
				         """Stop the MQTT server."""
			
 
				         logger.info("Stopping simple MQTT server")
			
 
				         self._running = False
			
 
				+        self.ready.clear()
			
 
				 
			
 
				         # Stop periodic status push
			
 
				         if self._status_push_task:
			
@@ -363,9 +407,19 @@ class SimpleMQTTServer:
 
				     async def _periodic_status_push(self) -> None:
			
 
				         """Send periodic status updates to all connected clients (1 Hz, exact pre-bridge behaviour)."""
			
 
				         logger.info("Starting periodic status push task")
			
 
				+        # Per-client push counters reset every 60 ticks. Lets us confirm from
			
 
				+        # logs whether the 1Hz push is actually reaching a specific slicer
			
 
				+        # connection (#1548 keepalive follow-up: keepalive parser shipped but
			
 
				+        # OrcaSlicer still disconnects on idle, and the periodic push is
			
 
				+        # otherwise silent at INFO level so it can't be observed in the
			
 
				+        # support bundle). One log line per minute per active connection —
			
 
				+        # nothing when no slicer is attached.
			
 
				+        push_counts: dict[str, int] = {}
			
 
				+        ticks_since_summary = 0
			
 
				         while self._running:
			
 
				             try:
			
 
				                 await asyncio.sleep(1)  # Push every 1 second like real printers
			
 
				+                ticks_since_summary += 1
			
 
				 
			
 
				                 disconnected = []
			
 
				                 for client_id, writer in list(self._clients.items()):
			
@@ -375,6 +429,7 @@ class SimpleMQTTServer:
 
				                             continue
			
 
				                         serial = self._client_serials.get(client_id, self.serial)
			
 
				                         await self._send_status_report(writer, serial=serial)
			
 
				+                        push_counts[client_id] = push_counts.get(client_id, 0) + 1
			
 
				                     except OSError as e:
			
 
				                         logger.debug("Failed to push status to %s: %s", client_id, e)
			
 
				                         disconnected.append(client_id)
			
@@ -383,6 +438,18 @@ class SimpleMQTTServer:
 
				                 for client_id in disconnected:
			
 
				                     self._clients.pop(client_id, None)
			
 
				                     self._client_serials.pop(client_id, None)
			
 
				+                    push_counts.pop(client_id, None)
			
 
				+
			
 
				+                if ticks_since_summary >= 60:
			
 
				+                    for cid, count in push_counts.items():
			
 
				+                        logger.info(
			
 
				+                            "%s1Hz status push: %d pushes/min to %s",
			
 
				+                            self._log_prefix,
			
 
				+                            count,
			
 
				+                            cid,
			
 
				+                        )
			
 
				+                    push_counts.clear()
			
 
				+                    ticks_since_summary = 0
			
 
				 
			
 
				             except asyncio.CancelledError:
			
 
				                 break
			
@@ -392,10 +459,17 @@ class SimpleMQTTServer:
 
				         logger.info("Periodic status push task stopped")
			
 
				 
			
 
				     async def push_raw_to_clients(self, topic: str, payload: bytes) -> None:
			
 
				-        """Publish a pre-serialized MQTT payload on `topic` to every connected slicer.
			
 
				+        """Publish a pre-serialized MQTT payload on `topic` to connected slicers.
			
 
				 
			
 
				         Called by MQTTBridge from the asyncio loop (scheduled via
			
 
				         run_coroutine_threadsafe from paho's network thread).
			
 
				+
			
 
				+        Routes the response only back to the originating slicer if the
			
 
				+        payload's sequence_id was previously recorded via
			
 
				+        ``_record_pending_request``. Falls back to fan-out for
			
 
				+        printer-initiated pushes (push_status etc.) and for sequence_ids
			
 
				+        we never saw (covers a slicer that subscribes mid-flight to a
			
 
				+        topic for which an earlier request is still in flight).
			
 
				         """
			
 
				         topic_bytes = topic.encode("utf-8")
			
 
				         # MQTT remaining-length: 2-byte topic length prefix + topic + message body.
			
@@ -414,8 +488,12 @@ class SimpleMQTTServer:
 
				         packet.extend(payload)
			
 
				         frame = bytes(packet)
			
 
				 
			
 
				+        target_client_id = self._lookup_pending_request_client(payload)
			
 
				+
			
 
				         disconnected = []
			
 
				         for client_id, writer in list(self._clients.items()):
			
 
				+            if target_client_id is not None and client_id != target_client_id:
			
 
				+                continue
			
 
				             try:
			
 
				                 if writer.is_closing():
			
 
				                     disconnected.append(client_id)
			
@@ -440,12 +518,18 @@ class SimpleMQTTServer:
 
				         logger.info("%sMQTT client connected: %s", self._log_prefix, client_id)
			
 
				 
			
 
				         authenticated = False
			
 
				+        # Per-packet read timeout. Before CONNECT we default to 60 s so a
			
 
				+        # client that opens TCP but never sends anything still gets reaped;
			
 
				+        # after CONNECT the value is updated to 1.5× the keepalive the
			
 
				+        # client negotiated (MQTT spec §4.4). ``None`` means no timeout,
			
 
				+        # which is what spec §3.1.2.10 mandates for keep_alive == 0.
			
 
				+        read_timeout: float | None = 60.0
			
 
				 
			
 
				         try:
			
 
				             while self._running:
			
 
				                 # Read MQTT fixed header
			
 
				                 try:
			
 
				-                    header = await asyncio.wait_for(reader.read(1), timeout=60)
			
 
				+                    header = await asyncio.wait_for(reader.read(1), timeout=read_timeout)
			
 
				                 except TimeoutError:
			
 
				                     break
			
 
				 
			
@@ -464,9 +548,30 @@ class SimpleMQTTServer:
 
				 
			
 
				                 # Handle packet types
			
 
				                 if packet_type == 1:  # CONNECT
			
 
				-                    authenticated = await self._handle_connect(payload, writer)
			
 
				+                    source_ip = addr[0] if addr else "unknown"
			
 
				+                    if self._is_auth_rate_limited(source_ip):
			
 
				+                        logger.warning(
			
 
				+                            "%sMQTT auth rate-limited from %s (>=%d failures in %ds)",
			
 
				+                            self._log_prefix,
			
 
				+                            source_ip,
			
 
				+                            _AUTH_RATE_LIMIT_MAX_ATTEMPTS,
			
 
				+                            int(_AUTH_RATE_LIMIT_WINDOW_SECONDS),
			
 
				+                        )
			
 
				+                        writer.write(bytes([0x20, 0x02, 0x00, 0x05]))  # Not authorized
			
 
				+                        await writer.drain()
			
 
				+                        break
			
 
				+                    authenticated, keep_alive = await self._handle_connect(payload, writer)
			
 
				                     if not authenticated:
			
 
				+                        self._record_auth_failure(source_ip)
			
 
				                         break
			
 
				+                    self._clear_auth_failures(source_ip)
			
 
				+                    # Honour the client's negotiated keepalive (#1548). Before
			
 
				+                    # this fix, the hardcoded 60 s above would close
			
 
				+                    # OrcaSlicer's idle connection at the keepalive boundary
			
 
				+                    # instead of waiting 1.5× as the spec requires — Orca
			
 
				+                    # sends PINGREQ within its own keepalive interval but
			
 
				+                    # we'd already have closed the socket.
			
 
				+                    read_timeout = keep_alive * 1.5 if keep_alive > 0 else None
			
 
				                     # Register client for periodic status pushes; start with
			
 
				                     # self.serial as the fallback until we learn the slicer's
			
 
				                     # preferred serial from the first SUBSCRIBE/PUBLISH.
			
@@ -488,7 +593,11 @@ class SimpleMQTTServer:
 
				         except asyncio.CancelledError:
			
 
				             pass  # Expected when server is shutting down and cancels client tasks
			
 
				         except Exception as e:
			
 
				-            logger.debug("MQTT client error: %s", e)
			
 
				+            # Outer handler — inner handlers already absorb expected parser
			
 
				+            # / IO failures at debug. Anything reaching here is unexpected
			
 
				+            # and would otherwise silently drop the slicer connection with
			
 
				+            # no actionable signal in production logs (defaults are INFO+).
			
 
				+            logger.warning("%sMQTT client session error from %s: %s", self._log_prefix, client_id, e)
			
 
				         finally:
			
 
				             logger.debug("MQTT client disconnected: %s", client_id)
			
 
				             self._clients.pop(client_id, None)
			
@@ -519,10 +628,86 @@ class SimpleMQTTServer:
 
				 
			
 
				         return None
			
 
				 
			
 
				-    async def _handle_connect(self, payload: bytes, writer: asyncio.StreamWriter) -> bool:
			
 
				+    def _record_pending_request(self, data: dict, client_id: str) -> None:
			
 
				+        """Stash sequence_id → client_id for any nested block with a sequence_id.
			
 
				+
			
 
				+        Slicer commands typically wrap their seq id in ``{"print": {...}}`` or
			
 
				+        ``{"info": {...}}`` / ``{"system": {...}}`` etc. Walks top-level dict
			
 
				+        values once to find the seq id; if absent (some commands omit it) we
			
 
				+        skip — the response will fall through to broadcast which is fine for
			
 
				+        unsolicited pushes.
			
 
				+        """
			
 
				+        for block in data.values():
			
 
				+            if isinstance(block, dict):
			
 
				+                seq = block.get("sequence_id")
			
 
				+                if seq is not None:
			
 
				+                    key = str(seq)
			
 
				+                    # Evict oldest entry when over the cap. Python dicts
			
 
				+                    # preserve insertion order so iter(self._pending_requests)
			
 
				+                    # yields the oldest key first.
			
 
				+                    while len(self._pending_requests) >= _PENDING_REQUEST_MAX_ENTRIES:
			
 
				+                        oldest = next(iter(self._pending_requests))
			
 
				+                        self._pending_requests.pop(oldest, None)
			
 
				+                    self._pending_requests[key] = client_id
			
 
				+                    return
			
 
				+
			
 
				+    def _lookup_pending_request_client(self, payload: bytes) -> str | None:
			
 
				+        """Parse a bridge-forwarded MQTT payload and return the originating
			
 
				+        client_id if its sequence_id was recorded.
			
 
				+
			
 
				+        Returns ``None`` for printer-initiated pushes (no recorded seq id) so
			
 
				+        push_raw_to_clients falls back to broadcast — required for push_status
			
 
				+        and the other unsolicited pushes that every connected slicer expects.
			
 
				+        """
			
 
				+        try:
			
 
				+            parsed = json.loads(payload)
			
 
				+        except (ValueError, TypeError):
			
 
				+            return None
			
 
				+        if not isinstance(parsed, dict):
			
 
				+            return None
			
 
				+        for block in parsed.values():
			
 
				+            if isinstance(block, dict):
			
 
				+                seq = block.get("sequence_id")
			
 
				+                if seq is not None:
			
 
				+                    return self._pending_requests.pop(str(seq), None)
			
 
				+        return None
			
 
				+
			
 
				+    def _is_auth_rate_limited(self, source_ip: str) -> bool:
			
 
				+        """Return True if ``source_ip`` has hit the per-IP failure cap.
			
 
				+
			
 
				+        Prunes timestamps older than the window so the dict doesn't grow
			
 
				+        unbounded. Uses ``time.monotonic()`` for a wall-clock-jump-immune
			
 
				+        clock that's safe to call from any context (sync or async).
			
 
				+        """
			
 
				+        import time as _time
			
 
				+
			
 
				+        now = _time.monotonic()
			
 
				+        window_start = now - _AUTH_RATE_LIMIT_WINDOW_SECONDS
			
 
				+        recent = [t for t in self._auth_failures.get(source_ip, []) if t >= window_start]
			
 
				+        if recent:
			
 
				+            self._auth_failures[source_ip] = recent
			
 
				+        else:
			
 
				+            self._auth_failures.pop(source_ip, None)
			
 
				+        return len(recent) >= _AUTH_RATE_LIMIT_MAX_ATTEMPTS
			
 
				+
			
 
				+    def _record_auth_failure(self, source_ip: str) -> None:
			
 
				+        """Append a timestamp for ``source_ip``'s failed auth attempt."""
			
 
				+        import time as _time
			
 
				+
			
 
				+        now = _time.monotonic()
			
 
				+        self._auth_failures.setdefault(source_ip, []).append(now)
			
 
				+
			
 
				+    def _clear_auth_failures(self, source_ip: str) -> None:
			
 
				+        """Reset ``source_ip``'s failure history after a successful auth."""
			
 
				+        self._auth_failures.pop(source_ip, None)
			
 
				+
			
 
				+    async def _handle_connect(self, payload: bytes, writer: asyncio.StreamWriter) -> tuple[bool, int]:
			
 
				         """Handle MQTT CONNECT packet.
			
 
				 
			
 
				-        Returns True if authentication successful.
			
 
				+        Returns ``(authenticated, keep_alive_seconds)`` — the second element
			
 
				+        is the value the client advertised in CONNECT, so the caller's
			
 
				+        read-loop can honour it instead of the hardcoded default. ``0``
			
 
				+        means the client opted out of keepalive (#1548).
			
 
				         """
			
 
				         try:
			
 
				             # Parse CONNECT packet
			
@@ -535,7 +720,12 @@ class SimpleMQTTServer:
 
				             # connect_flags = payload[idx + 1]
			
 
				             idx += 2
			
 
				 
			
 
				-            # Skip keepalive
			
 
				+            # Keepalive (2-byte big-endian, seconds). Honoured by the read
			
 
				+            # loop in `_handle_client` per MQTT spec §3.1.2.10 / §4.4 —
			
 
				+            # before #1548 we ignored this and used a hardcoded 60 s, which
			
 
				+            # closed OrcaSlicer's idle connection at exactly the negotiated
			
 
				+            # keepalive boundary instead of the spec-mandated 1.5×.
			
 
				+            keep_alive = (payload[idx] << 8) | payload[idx + 1]
			
 
				             idx += 2
			
 
				 
			
 
				             # Read client ID
			
@@ -555,8 +745,11 @@ class SimpleMQTTServer:
 
				             idx += 2
			
 
				             password = payload[idx : idx + password_len].decode("utf-8")
			
 
				 
			
 
				-            # Authenticate
			
 
				-            if username == "bblp" and password == self.access_code:
			
 
				+            # Authenticate. ``hmac.compare_digest`` is constant-time to keep
			
 
				+            # the auth check from leaking the access code via response timing
			
 
				+            # under network jitter — LAN-only threat is marginal, but it's
			
 
				+            # the standard fix and costs nothing.
			
 
				+            if username == "bblp" and hmac.compare_digest(password, self.access_code):
			
 
				                 # Send CONNACK with success
			
 
				                 writer.write(bytes([0x20, 0x02, 0x00, 0x00]))
			
 
				                 await writer.drain()
			
@@ -564,20 +757,20 @@ class SimpleMQTTServer:
 
				 
			
 
				                 # Send immediate status report after auth - slicer expects this
			
 
				                 await self._send_status_report(writer)
			
 
				-                return True
			
 
				+                return True, keep_alive
			
 
				             else:
			
 
				                 # Send CONNACK with auth failure
			
 
				                 writer.write(bytes([0x20, 0x02, 0x00, 0x05]))  # Not authorized
			
 
				                 await writer.drain()
			
 
				                 logger.warning("%sMQTT auth failed for user '%s' (access code mismatch)", self._log_prefix, username)
			
 
				-                return False
			
 
				+                return False, 0
			
 
				 
			
 
				         except (IndexError, ValueError) as e:
			
 
				             logger.debug("MQTT CONNECT parse error: %s", e)
			
 
				             # Send CONNACK with error
			
 
				             writer.write(bytes([0x20, 0x02, 0x00, 0x02]))  # Protocol error
			
 
				             await writer.drain()
			
 
				-            return False
			
 
				+            return False, 0
			
 
				 
			
 
				     async def _handle_subscribe(self, payload: bytes, writer: asyncio.StreamWriter, client_id: str) -> None:
			
 
				         """Handle MQTT SUBSCRIBE packet."""
			
@@ -647,7 +840,13 @@ class SimpleMQTTServer:
 
				             if isinstance(cached, dict):
			
 
				                 # Real-printer-shaped response. Copy the cache, then replace the
			
 
				                 # protocol / upload-state fields with values under our control.
			
 
				-                print_block = dict(cached)
			
 
				+                # Deep copy — current mutations are top-level only, but a future
			
 
				+                # override that writes into a nested dict (e.g. ``online``,
			
 
				+                # ``upgrade_state``, ``ipcam``) would otherwise corrupt the
			
 
				+                # bridge cache and be read by every subsequent subscriber until
			
 
				+                # the next real-printer push lands. Cost is one allocation per
			
 
				+                # status report; the cached dict is already short-lived.
			
 
				+                print_block = copy.deepcopy(cached)
			
 
				                 print_block["sequence_id"] = str(self._sequence_id)
			
 
				                 print_block["command"] = "push_status"
			
 
				                 print_block["msg"] = 0
			
@@ -673,6 +872,23 @@ class SimpleMQTTServer:
 
				                 print_block["home_flag"] = print_block.get("home_flag", 0) | 0x100  # bit 8 = HAS_SDCARD_NORMAL
			
 
				                 print_block["sdcard"] = True
			
 
				                 print_block.setdefault("storage", {"free": 1_000_000_000, "total": 32_000_000_000})
			
 
				+                # Live-progress fields the slicer's Send pre-flight reads
			
 
				+                # (#1558). When the real target printer is mid-print, the
			
 
				+                # cached push_status carries the real values for these
			
 
				+                # fields and the slicer reads the VP as "busy" — refusing
			
 
				+                # Send — even though gcode_state above is forced to IDLE.
			
 
				+                # For VP usage the VP isn't actually running the print
			
 
				+                # the printer is, so these need to mirror the synthetic
			
 
				+                # stub's idle values. Same shape as #1228 (storage) — the
			
 
				+                # cached-branch override set just needed extending.
			
 
				+                print_block["mc_print_stage"] = ""
			
 
				+                print_block["mc_percent"] = 0
			
 
				+                print_block["mc_remaining_time"] = 0
			
 
				+                print_block["stg"] = []
			
 
				+                print_block["stg_cur"] = 0
			
 
				+                print_block["layer_num"] = 0
			
 
				+                print_block["total_layer_num"] = 0
			
 
				+                print_block["print_error"] = 0
			
 
				                 status = {"print": print_block}
			
 
				                 await self._publish_to_report(writer, status, serial or self.serial)
			
 
				                 return
			
@@ -1026,6 +1242,10 @@ class SimpleMQTTServer:
 
				             # Forward anything the synthetic flow didn't handle to the real
			
 
				             # printer. AMS load / dry / xcam / system / extrusion_cali_get etc.
			
 
				             if not handled_locally and self._bridge is not None and self._bridge.is_active:
			
 
				+                # Remember which client originated this command so the
			
 
				+                # printer's response goes back only to them (not fanned
			
 
				+                # out to every connected slicer).
			
 
				+                self._record_pending_request(data, client_id)
			
 
				                 self._bridge.forward_to_printer(data)
			
 
				 
			
 
				         except (IndexError, ValueError, OSError) as e:
			
--- a/backend/app/services/virtual_printer/ssdp_server.py
+++ b/backend/app/services/virtual_printer/ssdp_server.py
@@ -55,6 +55,9 @@ class VirtualPrinterSSDPServer:
 
				         self.model = model
			
 
				         self._bind_ip = bind_ip
			
 
				         self._running = False
			
 
				+        # Set after the primary multicast socket is bound — see ftp_server.py
			
 
				+        # for rationale.
			
 
				+        self.ready = asyncio.Event()
			
 
				         self._socket: socket.socket | None = None
			
 
				         self._extra_sockets: list[socket.socket] = []
			
 
				         self._extra_interfaces = extra_interfaces or []
			
@@ -169,6 +172,7 @@ class VirtualPrinterSSDPServer:
 
				             local_ip = self._get_local_ip()
			
 
				             logger.info("SSDP server listening on port %s, advertising IP: %s", SSDP_PORT, local_ip)
			
 
				             logger.info("Virtual printer: %s (%s) model=%s", self.name, self.serial, self.model)
			
 
				+            self.ready.set()
			
 
				 
			
 
				             # Create extra sockets for additional interfaces (VPN, etc.)
			
 
				             # If no explicit extra interfaces given and we're bound to a
			
@@ -249,6 +253,7 @@ class VirtualPrinterSSDPServer:
 
				         """Stop the SSDP server."""
			
 
				         logger.info("Stopping SSDP server")
			
 
				         self._running = False
			
 
				+        self.ready.clear()
			
 
				         await self._cleanup()
			
 
				 
			
 
				     async def _cleanup(self) -> None:
			
--- a/backend/app/services/virtual_printer/tailscale.py
+++ b/backend/app/services/virtual_printer/tailscale.py
@@ -134,13 +134,18 @@ class TailscaleService:
 
				 
			
 
				         try:
			
 
				             returncode, stdout, stderr = await self._run_tailscale("status", "--json", timeout=5.0)
			
 
				-        except OSError as e:
			
 
				+        except (OSError, asyncio.TimeoutError) as e:
			
 
				+            # asyncio.TimeoutError covers the case where ``_run_tailscale``
			
 
				+            # killed a stuck subprocess and re-raised. Without this branch
			
 
				+            # the timeout escaped into the FastAPI route handler and could
			
 
				+            # crash the VP management UI for users with a lagging
			
 
				+            # tailscaled daemon.
			
 
				             return TailscaleStatus(
			
 
				                 available=False,
			
 
				                 hostname="",
			
 
				                 tailnet_name="",
			
 
				                 fqdn="",
			
 
				-                error=str(e),
			
 
				+                error=str(e) or "tailscale status timed out",
			
 
				             )
			
 
				 
			
 
				         if returncode is None or returncode != 0:
			
--- a/backend/app/services/virtual_printer/tcp_proxy.py
+++ b/backend/app/services/virtual_printer/tcp_proxy.py
@@ -194,6 +194,13 @@ class TLSProxy:
 
				         ctx.minimum_version = ssl.TLSVersion.TLSv1_2
			
 
				         # Don't require client certificates
			
 
				         ctx.verify_mode = ssl.CERT_NONE
			
 
				+        # Match real Bambu printer cipher behaviour on the slicer-facing side
			
 
				+        # as well (the #620 fix only patched the printer-facing client context
			
 
				+        # below). On hardened distros where OpenSSL `DEFAULT` strips the
			
 
				+        # plain-RSA AES-GCM suites, the slicer's ClientHello has no overlap
			
 
				+        # with our server's offered suites and the handshake fails before any
			
 
				+        # data flows (#1610 audit).
			
 
				+        ctx.set_ciphers("DEFAULT:AES256-GCM-SHA384:AES128-GCM-SHA256")
			
 
				         return ctx
			
 
				 
			
 
				     def _create_client_ssl_context(self) -> ssl.SSLContext:
			
@@ -814,7 +821,17 @@ class FTPTLSProxy(TLSProxy):
 
				 
			
 
				     async def stop(self) -> None:
			
 
				         """Stop proxy and clean up data connection servers."""
			
 
				-        # Close all data servers first
			
 
				+        # Cancel any pending auto_close timeouts so they don't outlive the
			
 
				+        # proxy holding a dead server reference. Without this, up to 101
			
 
				+        # tasks lingered for ~60 s after stop(), each gripping a server
			
 
				+        # ref + an active_connections slot; under rapid mode-switch the
			
 
				+        # ports stayed bound long enough to fail the next start().
			
 
				+        for task in list(self._auto_close_tasks):
			
 
				+            task.cancel()
			
 
				+        if self._auto_close_tasks:
			
 
				+            await asyncio.gather(*self._auto_close_tasks, return_exceptions=True)
			
 
				+        self._auto_close_tasks.clear()
			
 
				+        # Close all data servers
			
 
				         for server in list(self._data_servers):
			
 
				             try:
			
 
				                 server.close()
			
@@ -827,6 +844,7 @@ class FTPTLSProxy(TLSProxy):
 
				     async def start(self) -> None:
			
 
				         """Start the FTP TLS proxy."""
			
 
				         self._data_servers: list[asyncio.Server] = []
			
 
				+        self._auto_close_tasks: list[asyncio.Task] = []
			
 
				         await super().start()
			
 
				 
			
 
				     async def _handle_client(
			
@@ -1408,7 +1426,11 @@ class FTPTLSProxy(TLSProxy):
 
				                 if server in self._data_servers:
			
 
				                     self._data_servers.remove(server)
			
 
				 
			
 
				-        asyncio.create_task(auto_close(), name=f"ftp_data_timeout_{port}")
			
 
				+        # Track the auto_close task so stop() can cancel it; otherwise the
			
 
				+        # 60 s timeout would hold a server reference past proxy teardown.
			
 
				+        ac_task = asyncio.create_task(auto_close(), name=f"ftp_data_timeout_{port}")
			
 
				+        self._auto_close_tasks.append(ac_task)
			
 
				+        ac_task.add_done_callback(lambda t, tasks=self._auto_close_tasks: tasks.remove(t) if t in tasks else None)
			
 
				 
			
 
				         logger.debug("FTP data proxy: port %s → %s:%s", port, printer_ip, printer_port)
			
 
				 
			
@@ -1469,6 +1491,17 @@ class SlicerProxyManager:
 
				         self._bind_server = None
			
 
				         self._probe_servers: list[asyncio.Server] = []
			
 
				         self._tasks: list[asyncio.Task] = []
			
 
				+        # Pre-bind the lifetime-coupled collections so ``stop()`` works if
			
 
				+        # called before ``start()`` finishes (rapid mode-switch races).
			
 
				+        # Previously ``_ftp_data_proxies`` was first assigned inside ``start()``
			
 
				+        # at line ~1520, so an early stop hit AttributeError and left
			
 
				+        # sockets stranded.
			
 
				+        self._ftp_data_proxies: list[TCPProxy] = []
			
 
				+        # Actual FTP listen port — class constant by default; ``start()``
			
 
				+        # overwrites with the redirect target when iptables-redirect is
			
 
				+        # active. ``get_status()`` reads this so diagnostics probe the
			
 
				+        # port that actually has a listener, not the static LOCAL_FTP_PORT.
			
 
				+        self._actual_ftp_port: int = self.LOCAL_FTP_PORT
			
 
				 
			
 
				     # FTP passive data port range — Bambu printers typically use ports in
			
 
				     # this range for EPSV/PASV data connections. We pre-listen on all of
			
@@ -1499,8 +1532,25 @@ class SlicerProxyManager:
 
				                 redirect_target,
			
 
				             )
			
 
				             ftp_listen_port = redirect_target
			
 
				-
			
 
				-        # FTP control — raw TCP pass-through (end-to-end TLS with printer)
			
 
				+        # Cache the actual listen port for get_status() / diagnostic so the
			
 
				+        # port_ftps check probes the port that actually has a socket.
			
 
				+        self._actual_ftp_port = ftp_listen_port
			
 
				+
			
 
				+        # FTP control — raw TCP pass-through (end-to-end TLS with printer).
			
 
				+        # A TLS 1.3 → 1.2 ClientHello-rewrite was attempted to work around
			
 
				+        # BambuStudio's libcurl bug on the X1C FTPS data channel (PSK
			
 
				+        # session-resumption + CURLE_PARTIAL_FILE). Reverted because the
			
 
				+        # rewrite broke the control-channel TLS handshake itself: replacing
			
 
				+        # 0x0304 with a duplicate 0x0303 in supported_versions while leaving
			
 
				+        # the TLS-1.3-only extensions (key_share, psk_key_exchange_modes,
			
 
				+        # signature_algorithms_cert) in place produced a malformed ClientHello
			
 
				+        # that the printer or slicer rejected, and the connection closed
			
 
				+        # before any data channel was opened. A proper fix needs full TLS
			
 
				+        # bumping (terminate + re-establish) with packet-capture work
			
 
				+        # that's out of scope for now. X1C proxy-mode FTP uploads remain
			
 
				+        # broken — users with X1C should use the non-proxy modes (immediate
			
 
				+        # / review / print_queue) which work end-to-end via the VP's own
			
 
				+        # FTP server on TLS 1.2.
			
 
				         self._ftp_proxy = TCPProxy(
			
 
				             name="FTP",
			
 
				             listen_port=ftp_listen_port,
			
@@ -1745,8 +1795,16 @@ class SlicerProxyManager:
 
				             await dp.stop()
			
 
				         self._ftp_data_proxies = []
			
 
				 
			
 
				+        # Probe servers need wait_closed — without it the OS releases the
			
 
				+        # bind socket asynchronously and a rapid stop+start cycle (e.g.
			
 
				+        # config-change-driven mode switch) can race "address already in
			
 
				+        # use" on the probe ports.
			
 
				         for srv in self._probe_servers:
			
 
				-            srv.close()
			
 
				+            try:
			
 
				+                srv.close()
			
 
				+                await srv.wait_closed()
			
 
				+            except OSError:
			
 
				+                pass  # Best-effort — port may already be released
			
 
				         self._probe_servers = []
			
 
				 
			
 
				         # Cancel tasks
			
@@ -1798,7 +1856,14 @@ class SlicerProxyManager:
 
				         return {
			
 
				             "running": self.is_running,
			
 
				             "target_host": self.target_host,
			
 
				-            "ftp_port": self.LOCAL_FTP_PORT,
			
 
				+            # ``_actual_ftp_port`` reflects the iptables-redirected listen
			
 
				+            # port when the docker-host deployment uses
			
 
				+            # ``iptables -t nat -A PREROUTING ... REDIRECT --to-port`` to
			
 
				+            # let non-root containers serve on the printer's 990. Returning
			
 
				+            # the class constant here made the diagnostic probe a port
			
 
				+            # nothing was listening on and report a false fail on every
			
 
				+            # working redirect deployment.
			
 
				+            "ftp_port": self._actual_ftp_port,
			
 
				             "mqtt_port": self.LOCAL_MQTT_PORT,
			
 
				             "bind_ports": self.PRINTER_BIND_PORTS,
			
 
				             "ftp_connections": (len(self._ftp_proxy._active_connections) if self._ftp_proxy else 0),
			
--- a/backend/app/utils/filename.py
+++ b/backend/app/utils/filename.py
@@ -0,0 +1,90 @@
 
				+"""Print-file filename validation matching Bambu Studio's save-dialog rules.
			
 
				+
			
 
				+The Bambu printer SD card is FAT32/exFAT. Names containing the Windows /
			
 
				+DOS-reserved set (``< > : " / \\ | ? *``), ASCII control characters
			
 
				+(0x00-0x1F), or trailing dots / spaces cannot be created on it — FTP fails
			
 
				+with ``553 Could not create file`` (#1540). Bambu Studio refuses to save
			
 
				+such names client-side; Bambuddy now does the same at the rename, upload,
			
 
				+and dispatch boundaries so the failure surfaces with a clear message
			
 
				+instead of an obscure FTP error after the user has already hit Print.
			
 
				+"""
			
 
				+
			
 
				+INVALID_FILENAME_CHARS = '<>:"/\\|?*'
			
 
				+
			
 
				+# FAT/exFAT cap on a single path component; UTF-8 byte length, not codepoints,
			
 
				+# because that is what the on-disk encoding limit actually is.
			
 
				+MAX_FILENAME_BYTES = 255
			
 
				+
			
 
				+
			
 
				+class InvalidFilenameError(ValueError):
			
 
				+    """Filename contains characters or shape the printer SD card rejects.
			
 
				+
			
 
				+    ``char`` is the first offending character when the failure is a
			
 
				+    character-set violation, or ``None`` for structural failures (empty,
			
 
				+    bare ``.``, trailing space, too long, etc.). The frontend echoes it
			
 
				+    back to the user in the Bambu Studio-style error message.
			
 
				+    """
			
 
				+
			
 
				+    def __init__(self, message: str, char: str | None = None):
			
 
				+        super().__init__(message)
			
 
				+        self.char = char
			
 
				+
			
 
				+
			
 
				+def validate_print_filename(name: str) -> None:
			
 
				+    """Raise ``InvalidFilenameError`` if ``name`` would fail on the SD card.
			
 
				+
			
 
				+    Matches Bambu Studio's save-dialog rejection set. Callers are expected
			
 
				+    to translate the exception into an HTTP 400 (or a clean dispatch
			
 
				+    rejection); the message is intentionally short and ASCII so it fits
			
 
				+    a translation template.
			
 
				+    """
			
 
				+    if not name or not name.strip():
			
 
				+        raise InvalidFilenameError("Filename cannot be empty")
			
 
				+
			
 
				+    if name in (".", ".."):
			
 
				+        raise InvalidFilenameError("Filename cannot be '.' or '..'")
			
 
				+
			
 
				+    for ch in name:
			
 
				+        if ch in INVALID_FILENAME_CHARS:
			
 
				+            raise InvalidFilenameError(f"Filename contains invalid character: {ch}", char=ch)
			
 
				+        if ord(ch) < 0x20:
			
 
				+            raise InvalidFilenameError("Filename contains a control character", char=ch)
			
 
				+
			
 
				+    if name.endswith(" ") or name.endswith("."):
			
 
				+        raise InvalidFilenameError("Filename cannot end with a space or dot")
			
 
				+
			
 
				+    if len(name.encode("utf-8")) > MAX_FILENAME_BYTES:
			
 
				+        raise InvalidFilenameError(f"Filename exceeds {MAX_FILENAME_BYTES} bytes")
			
 
				+
			
 
				+
			
 
				+def derive_remote_filename(filename: str) -> str:
			
 
				+    """Compute the SD-card filename used when uploading a sliced print file.
			
 
				+
			
 
				+    Strips repeated trailing ``.gcode.3mf`` / ``.3mf`` suffixes until the
			
 
				+    bare stem remains, then appends a single ``.3mf``; spaces are
			
 
				+    replaced with underscores because the firmware parses
			
 
				+    ``ftp://{filename}`` as a URL.
			
 
				+
			
 
				+    Canonical for both the dispatch uploader and the post-print SD
			
 
				+    cleanup — when the two drift apart the cleanup misses, and a
			
 
				+    library row whose stored filename ended up with a doubled
			
 
				+    ``.gcode.3mf`` (#1542) leaves the real file on the SD card. On A1
			
 
				+    firmware that lingering file becomes a ghost print on the next
			
 
				+    power-on (same family as the P1S behaviour in #374).
			
 
				+
			
 
				+    Raises ``TypeError`` on non-string input rather than entering the
			
 
				+    strip loop, because a duck-typed object that returns truthy
			
 
				+    sentinels from ``endswith`` would never escape and the resulting
			
 
				+    unbounded allocation has cgroup-OOM'd the test runner under mocks.
			
 
				+    """
			
 
				+    if not isinstance(filename, str):
			
 
				+        raise TypeError(f"derive_remote_filename requires str, got {type(filename).__name__}")
			
 
				+    stem = filename
			
 
				+    while True:
			
 
				+        if stem.endswith(".gcode.3mf"):
			
 
				+            stem = stem[:-10]
			
 
				+        elif stem.endswith(".3mf"):
			
 
				+            stem = stem[:-4]
			
 
				+        else:
			
 
				+            break
			
 
				+    return f"{stem}.3mf".replace(" ", "_")
			
--- a/backend/app/utils/safe_path.py
+++ b/backend/app/utils/safe_path.py
@@ -0,0 +1,114 @@
 
				+"""Containment-checked path joining.
			
 
				+
			
 
				+Single source of truth for joining a user-controlled string under a trusted
			
 
				+parent directory. The two-vector arbitrary-file-write reported against
			
 
				+``backend/app/api/routes/projects.py::import_project_file`` traced to plain
			
 
				+``Path / user_string`` arithmetic with no resolve + containment check —
			
 
				+attacker passed an absolute path, ``Path("/lib") / "/etc"`` collapsed to
			
 
				+``Path("/etc")``, and the next ``write_bytes`` landed wherever the attacker
			
 
				+chose. This module is the answer.
			
 
				+
			
 
				+Every site that joins a path component coming from a request body, a ZIP
			
 
				+``namelist()``, an ``UploadFile.filename``, or any other attacker-controlled
			
 
				+source MUST route through ``safe_join_under``. Sites that join trusted
			
 
				+constants (settings paths, hardcoded subdirs) are not in scope — those should
			
 
				+carry a ``# SEC-PATH-OK: <reason>`` marker so the CI backstop knows.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+from pathlib import Path
			
 
				+
			
 
				+from fastapi import HTTPException
			
 
				+
			
 
				+
			
 
				+class PathTraversalError(ValueError):
			
 
				+    """Raised when a join attempt would escape the trusted parent.
			
 
				+
			
 
				+    Callers in API-route context catch this and translate to ``HTTPException``
			
 
				+    via ``safe_join_under`` (which already raises HTTPException directly when
			
 
				+    invoked with ``http=True``). Non-route callers can catch the
			
 
				+    ``PathTraversalError`` and decide their own response shape.
			
 
				+    """
			
 
				+
			
 
				+
			
 
				+def safe_join_under(parent: Path, *parts: str, http: bool = True) -> Path:
			
 
				+    """Join *parts* under *parent* and assert the result stays under it.
			
 
				+
			
 
				+    Rejects:
			
 
				+    - empty / None / non-str parts;
			
 
				+    - parts containing NUL (``\\x00``);
			
 
				+    - parts starting with ``/`` or ``\\`` (absolute paths;
			
 
				+      ``Path("/lib") / "/etc"`` discards ``/lib``);
			
 
				+    - any sequence whose resolved form is not a descendant of *parent*'s
			
 
				+      resolved form (defeats ``..`` traversal even when the literal join
			
 
				+      doesn't look suspicious).
			
 
				+
			
 
				+    Returns the resolved absolute path on success.
			
 
				+
			
 
				+    When ``http=True`` (default; suitable for FastAPI routes), failures raise
			
 
				+    ``HTTPException(400, "Invalid path in upload")``. Set ``http=False`` to
			
 
				+    raise ``PathTraversalError`` instead — for non-route callers that need
			
 
				+    finer control over the response.
			
 
				+    """
			
 
				+    if not parts:
			
 
				+        _fail("safe_join_under called with no parts", http)
			
 
				+
			
 
				+    for part in parts:
			
 
				+        if not isinstance(part, str):
			
 
				+            _fail(f"Path part has type {type(part).__name__}, expected str", http)
			
 
				+        if not part:
			
 
				+            _fail("Empty path part", http)
			
 
				+        if "\x00" in part:
			
 
				+            _fail("NUL byte in path part", http)
			
 
				+        # Reject literal absolute markers: pathlib collapses ``Path("/a") /
			
 
				+        # "/b"`` to ``Path("/b")`` so the catch-after-resolve below would also
			
 
				+        # fire, but rejecting up-front gives a clearer error and avoids
			
 
				+        # touching the filesystem.
			
 
				+        if part.startswith("/") or part.startswith("\\"):
			
 
				+            _fail("Absolute path part not allowed", http)
			
 
				+
			
 
				+    parent_resolved = parent.resolve()
			
 
				+    candidate = parent
			
 
				+    for part in parts:
			
 
				+        candidate = candidate / part
			
 
				+    candidate_resolved = candidate.resolve()
			
 
				+
			
 
				+    if not _is_relative_to(candidate_resolved, parent_resolved):
			
 
				+        _fail("Path escapes the parent directory", http)
			
 
				+
			
 
				+    return candidate_resolved
			
 
				+
			
 
				+
			
 
				+def assert_under(parent: Path, candidate: Path, *, http: bool = True) -> Path:
			
 
				+    """Assert that an already-joined *candidate* path is under *parent*.
			
 
				+
			
 
				+    Use when you have an existing ``Path`` (e.g. from another helper that
			
 
				+    builds the path itself) and need a containment check before writing or
			
 
				+    deleting. Equivalent to ``safe_join_under`` minus the per-part input
			
 
				+    validation.
			
 
				+    """
			
 
				+    parent_resolved = parent.resolve()
			
 
				+    candidate_resolved = candidate.resolve()
			
 
				+    if not _is_relative_to(candidate_resolved, parent_resolved):
			
 
				+        _fail("Path escapes the parent directory", http)
			
 
				+    return candidate_resolved
			
 
				+
			
 
				+
			
 
				+def _is_relative_to(child: Path, parent: Path) -> bool:
			
 
				+    # ``Path.is_relative_to`` exists in Python 3.9+. Bambuddy targets 3.11+
			
 
				+    # (per pyproject and the bug-report system info) so this is safe.
			
 
				+    try:
			
 
				+        return child.is_relative_to(parent)
			
 
				+    except AttributeError:  # pragma: no cover - defensive
			
 
				+        try:
			
 
				+            child.relative_to(parent)
			
 
				+            return True
			
 
				+        except ValueError:
			
 
				+            return False
			
 
				+
			
 
				+
			
 
				+def _fail(reason: str, http: bool) -> None:
			
 
				+    if http:
			
 
				+        raise HTTPException(status_code=400, detail="Invalid path in upload")
			
 
				+    raise PathTraversalError(reason)
			
--- a/backend/tests/integration/test_archives_api.py
+++ b/backend/tests/integration/test_archives_api.py
@@ -3,6 +3,8 @@
 
				 Tests the full request/response cycle for /api/v1/archives/ endpoints.
			
 
				 """
			
 
				 
			
 
				+from pathlib import Path
			
 
				+
			
 
				 import pytest
			
 
				 from httpx import AsyncClient
			
 
				 
			
@@ -1157,3 +1159,143 @@ class TestArchiveF3DEndpoints:
 
				         response = await async_client.delete("/api/v1/archives/tags/nonexistent-tag")
			
 
				         assert response.status_code == 200
			
 
				         assert response.json()["affected"] == 0
			
 
				+
			
 
				+
			
 
				+class TestUploadSourceThreeMF:
			
 
				+    """Regression for #1531: source-3MF upload on fallback archives."""
			
 
				+
			
 
				+    @staticmethod
			
 
				+    def _minimal_3mf_bytes() -> bytes:
			
 
				+        """Smallest valid .3mf — the upload path enforces a zip header check."""
			
 
				+        import io
			
 
				+        import zipfile
			
 
				+
			
 
				+        buf = io.BytesIO()
			
 
				+        with zipfile.ZipFile(buf, "w") as zf:
			
 
				+            zf.writestr("[Content_Types].xml", "<types/>")
			
 
				+        return buf.getvalue()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_fallback_archive_source_upload_lands_under_base_dir(
			
 
				+        self, async_client: AsyncClient, archive_factory, printer_factory, monkeypatch, tmp_path
			
 
				+    ):
			
 
				+        """Fallback archive (file_path='') must accept a source upload and store it inside base_dir.
			
 
				+
			
 
				+        Pre-fix, ``Path(base_dir) / ''`` collapsed to ``base_dir`` and the
			
 
				+        ``.parent`` walked out of the data volume, sending the file to
			
 
				+        ``/app/source/...`` and crashing on ``relative_to``.
			
 
				+        """
			
 
				+        from backend.app.core.config import settings as app_settings
			
 
				+
			
 
				+        monkeypatch.setattr(app_settings, "base_dir", tmp_path)
			
 
				+
			
 
				+        printer = await printer_factory()
			
 
				+        archive = await archive_factory(
			
 
				+            printer.id,
			
 
				+            print_name="Cloud Print",
			
 
				+            file_path="",  # fallback archive — no source 3MF was archived
			
 
				+            filename="Cloud Print.3mf",
			
 
				+        )
			
 
				+
			
 
				+        files = {"file": ("cloud_print.3mf", self._minimal_3mf_bytes(), "application/octet-stream")}
			
 
				+        response = await async_client.post(f"/api/v1/archives/{archive.id}/source", files=files)
			
 
				+
			
 
				+        assert response.status_code == 200, response.text
			
 
				+        payload = response.json()
			
 
				+        rel = payload["source_3mf_path"]
			
 
				+        # Stored as a relative path inside base_dir.
			
 
				+        assert not rel.startswith("/"), f"source_3mf_path should be relative, got {rel!r}"
			
 
				+        # File physically landed under base_dir (NOT escaped to /app/source/).
			
 
				+        assert (tmp_path / rel).is_file()
			
 
				+        # Deterministic fallback location keyed off archive id.
			
 
				+        assert rel == f"archive/no_source/{archive.id}/cloud_print.3mf"
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_normal_archive_source_upload_unchanged(
			
 
				+        self, async_client: AsyncClient, archive_factory, printer_factory, monkeypatch, tmp_path
			
 
				+    ):
			
 
				+        """Normal archive (file_path set) still nests the source under <archive>/source/."""
			
 
				+        from backend.app.core.config import settings as app_settings
			
 
				+
			
 
				+        monkeypatch.setattr(app_settings, "base_dir", tmp_path)
			
 
				+
			
 
				+        printer = await printer_factory()
			
 
				+        # archive_factory's default file_path is "archives/test/test_print.gcode.3mf".
			
 
				+        archive = await archive_factory(printer.id, print_name="Real Print")
			
 
				+
			
 
				+        files = {"file": ("real_print.3mf", self._minimal_3mf_bytes(), "application/octet-stream")}
			
 
				+        response = await async_client.post(f"/api/v1/archives/{archive.id}/source", files=files)
			
 
				+
			
 
				+        assert response.status_code == 200, response.text
			
 
				+        rel = response.json()["source_3mf_path"]
			
 
				+        assert rel == "archives/test/source/real_print.3mf"
			
 
				+        assert (tmp_path / rel).is_file()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_symlinked_data_dir_upload_succeeds(
			
 
				+        self, async_client: AsyncClient, archive_factory, printer_factory, monkeypatch, tmp_path
			
 
				+    ):
			
 
				+        """Regression: DATA_DIR that's a symlink to the real storage must not break the upload.
			
 
				+
			
 
				+        Common on TrueNAS / Synology / QNAP storage pools, and any
			
 
				+        ``-v /symlinked/host/path:/app/data`` mount. The helper resolves
			
 
				+        only for the containment check and returns literal paths so the
			
 
				+        caller's ``relative_to(settings.base_dir)`` doesn't trip over a
			
 
				+        canonical-vs-symlink mismatch.
			
 
				+        """
			
 
				+        from backend.app.core.config import settings as app_settings
			
 
				+
			
 
				+        real_dir = tmp_path / "real_storage"
			
 
				+        real_dir.mkdir()
			
 
				+        symlink_dir = tmp_path / "data_via_symlink"
			
 
				+        symlink_dir.symlink_to(real_dir)
			
 
				+        monkeypatch.setattr(app_settings, "base_dir", symlink_dir)
			
 
				+
			
 
				+        printer = await printer_factory()
			
 
				+        archive = await archive_factory(
			
 
				+            printer.id,
			
 
				+            print_name="Symlinked Print",
			
 
				+            file_path="archives/X1C/print.gcode.3mf",
			
 
				+            filename="print.gcode.3mf",
			
 
				+        )
			
 
				+
			
 
				+        files = {"file": ("print.3mf", self._minimal_3mf_bytes(), "application/octet-stream")}
			
 
				+        response = await async_client.post(f"/api/v1/archives/{archive.id}/source", files=files)
			
 
				+
			
 
				+        assert response.status_code == 200, response.text
			
 
				+        rel = response.json()["source_3mf_path"]
			
 
				+        assert rel == "archives/X1C/source/print.3mf"
			
 
				+        # Reachable via both the symlink and the canonical path.
			
 
				+        assert (symlink_dir / rel).is_file()
			
 
				+        assert (real_dir / rel).is_file()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_absolute_file_path_rejected_with_clear_500(
			
 
				+        self, async_client: AsyncClient, archive_factory, printer_factory, monkeypatch, tmp_path
			
 
				+    ):
			
 
				+        """A row whose file_path is absolute (corrupted by old import / manual edit)
			
 
				+        must fail with the explicit "outside the data directory" message, not silently
			
 
				+        write outside base_dir."""
			
 
				+        from backend.app.core.config import settings as app_settings
			
 
				+
			
 
				+        monkeypatch.setattr(app_settings, "base_dir", tmp_path)
			
 
				+
			
 
				+        printer = await printer_factory()
			
 
				+        archive = await archive_factory(
			
 
				+            printer.id,
			
 
				+            print_name="Corrupt Path",
			
 
				+            file_path="/tmp/totally_outside.gcode.3mf",  # nosec B108
			
 
				+            filename="totally_outside.gcode.3mf",
			
 
				+        )
			
 
				+
			
 
				+        files = {"file": ("totally_outside.3mf", self._minimal_3mf_bytes(), "application/octet-stream")}
			
 
				+        response = await async_client.post(f"/api/v1/archives/{archive.id}/source", files=files)
			
 
				+
			
 
				+        assert response.status_code == 500
			
 
				+        assert "outside the data directory" in response.json()["detail"]
			
 
				+        # Did not write anything under the bogus /tmp/source/ either.
			
 
				+        assert not (Path("/tmp") / "source").exists() or not (Path("/tmp") / "source" / "totally_outside.3mf").exists()  # nosec B108
			
--- a/backend/tests/integration/test_auth_apikey_rbac.py
+++ b/backend/tests/integration/test_auth_apikey_rbac.py
@@ -147,10 +147,13 @@ class TestApiKeyDenylistIntegrity:
 
				         from backend.app.core.auth import _APIKEY_DENIED_PERMISSIONS
			
 
				         from backend.app.core.permissions import Permission
			
 
				 
			
 
				+        # NOTE: under the GHSA-r2qv-8222-hqg3 allowlist model, INVENTORY_CREATE
			
 
				+        # and INVENTORY_UPDATE are administrative (not in the allowlist) and
			
 
				+        # therefore denied for API keys regardless of denylist membership.
			
 
				+        # This test still guards the small denylist-redundancy set of read-y
			
 
				+        # permissions that the SpoolBuddy kiosk + status integrations rely on.
			
 
				         expected_allowed = {
			
 
				             Permission.INVENTORY_READ,
			
 
				-            Permission.INVENTORY_CREATE,
			
 
				-            Permission.INVENTORY_UPDATE,
			
 
				             Permission.PRINTERS_READ,
			
 
				             Permission.PRINTERS_CONTROL,
			
 
				             Permission.ARCHIVES_READ,
			
@@ -159,3 +162,274 @@ class TestApiKeyDenylistIntegrity:
 
				         }
			
 
				         incorrectly_denied = expected_allowed & _APIKEY_DENIED_PERMISSIONS
			
 
				         assert not incorrectly_denied, f"Operational permissions incorrectly in API key denylist: {incorrectly_denied}"
			
 
				+
			
 
				+
			
 
				+class TestApiKeyScopeAllowlist:
			
 
				+    """GHSA-r2qv-8222-hqg3 (CVSS 9.9) — allowlist-based scope enforcement.
			
 
				+
			
 
				+    Verifies that ``_check_apikey_permissions`` (and the higher-level
			
 
				+    dependencies that call it) honour the per-permission scope mapping rather
			
 
				+    than the legacy denylist-only model. Failures here would re-open the
			
 
				+    "Read Status / Manage Queue / Control Printer / Manage Library checkboxes
			
 
				+    are decorative" class of bug.
			
 
				+    """
			
 
				+
			
 
				+    def test_every_permission_has_a_classification(self):
			
 
				+        """Structural: every Permission must be either allowlisted or admin-denied.
			
 
				+
			
 
				+        This is the load-bearing drift-detection test for the allowlist model.
			
 
				+        A new Permission added to ``core/permissions.py`` without a matching
			
 
				+        entry in ``_APIKEY_SCOPE_BY_PERMISSION`` or ``_APIKEY_DENIED_PERMISSIONS``
			
 
				+        is functionally admin-only (allowlist failure → 403) — that's the safe
			
 
				+        default, but it should be an explicit choice rather than an oversight.
			
 
				+        """
			
 
				+        from backend.app.core.auth import (
			
 
				+            _APIKEY_DENIED_PERMISSIONS,
			
 
				+            _APIKEY_SCOPE_BY_PERMISSION,
			
 
				+        )
			
 
				+        from backend.app.core.permissions import Permission
			
 
				+
			
 
				+        unclassified = {
			
 
				+            perm
			
 
				+            for perm in Permission
			
 
				+            if perm not in _APIKEY_SCOPE_BY_PERMISSION and perm not in _APIKEY_DENIED_PERMISSIONS
			
 
				+        }
			
 
				+        assert not unclassified, (
			
 
				+            "Every Permission must be classified for API-key access. "
			
 
				+            "Either add to _APIKEY_SCOPE_BY_PERMISSION (with scope flag) or "
			
 
				+            f"_APIKEY_DENIED_PERMISSIONS (admin-only). Unclassified: {unclassified}"
			
 
				+        )
			
 
				+
			
 
				+    def test_allowlist_uses_only_valid_scope_flags(self):
			
 
				+        """Every value in the scope mapping must be a real bool field on APIKey."""
			
 
				+        from backend.app.core.auth import _APIKEY_SCOPE_BY_PERMISSION
			
 
				+        from backend.app.models.api_key import APIKey
			
 
				+
			
 
				+        # can_access_cloud / can_update_energy_cost are narrow opt-in scopes;
			
 
				+        # the latter routes through its own ``require_energy_cost_update`` dep
			
 
				+        # rather than the central allowlist, so it doesn't appear here.
			
 
				+        valid_flags = {
			
 
				+            "can_read_status",
			
 
				+            "can_queue",
			
 
				+            "can_control_printer",
			
 
				+            "can_manage_library",
			
 
				+            "can_manage_inventory",
			
 
				+            "can_access_cloud",
			
 
				+        }
			
 
				+        used_flags = set(_APIKEY_SCOPE_BY_PERMISSION.values())
			
 
				+        assert used_flags <= valid_flags, f"Unknown scope flags in mapping: {used_flags - valid_flags}"
			
 
				+        # And every flag must actually exist on the model.
			
 
				+        for flag in valid_flags:
			
 
				+            assert hasattr(APIKey, flag), f"APIKey model missing column referenced by allowlist: {flag}"
			
 
				+
			
 
				+    def test_allowlist_and_denylist_are_disjoint(self):
			
 
				+        """A permission classified as allowlisted must not also be in the denylist (and v/v)."""
			
 
				+        from backend.app.core.auth import (
			
 
				+            _APIKEY_DENIED_PERMISSIONS,
			
 
				+            _APIKEY_SCOPE_BY_PERMISSION,
			
 
				+        )
			
 
				+
			
 
				+        overlap = set(_APIKEY_SCOPE_BY_PERMISSION) & _APIKEY_DENIED_PERMISSIONS
			
 
				+        assert not overlap, f"Permissions in both allowlist and denylist: {overlap}"
			
 
				+
			
 
				+    @pytest.mark.parametrize(
			
 
				+        "scope_flag",
			
 
				+        [
			
 
				+            "can_read_status",
			
 
				+            "can_queue",
			
 
				+            "can_control_printer",
			
 
				+            "can_manage_library",
			
 
				+            "can_manage_inventory",
			
 
				+            "can_access_cloud",
			
 
				+        ],
			
 
				+    )
			
 
				+    def test_each_scope_flag_has_at_least_one_permission(self, scope_flag):
			
 
				+        """If a scope flag has no permissions, it's dead code — fail loudly."""
			
 
				+        from backend.app.core.auth import _APIKEY_SCOPE_BY_PERMISSION
			
 
				+
			
 
				+        assert scope_flag in _APIKEY_SCOPE_BY_PERMISSION.values(), (
			
 
				+            f"No permission maps to {scope_flag} — either remove the flag or classify a permission under it."
			
 
				+        )
			
 
				+
			
 
				+
			
 
				+class _FakeApiKey:
			
 
				+    """Bool-attribute stand-in for APIKey used by the scope matrix tests.
			
 
				+
			
 
				+    The ``_check_apikey_permissions`` function only inspects the four scope
			
 
				+    booleans, so a lightweight stub is enough; instantiating the real model
			
 
				+    requires a DB session which is overkill for pure-logic verification.
			
 
				+    """
			
 
				+
			
 
				+    def __init__(
			
 
				+        self,
			
 
				+        can_read_status=False,
			
 
				+        can_queue=False,
			
 
				+        can_control_printer=False,
			
 
				+        can_manage_library=False,
			
 
				+        can_manage_inventory=False,
			
 
				+    ):
			
 
				+        self.can_read_status = can_read_status
			
 
				+        self.can_queue = can_queue
			
 
				+        self.can_control_printer = can_control_printer
			
 
				+        self.can_manage_library = can_manage_library
			
 
				+        self.can_manage_inventory = can_manage_inventory
			
 
				+
			
 
				+
			
 
				+class TestCheckApiKeyPermissionsMatrix:
			
 
				+    """Pure-logic matrix: every (scope flag combo × representative permission) outcome.
			
 
				+
			
 
				+    These are the tests that would have caught GHSA-r2qv-8222-hqg3 — they prove
			
 
				+    the actual gate function honours the scope flags, not just that some
			
 
				+    helper called by webhook.py does.
			
 
				+    """
			
 
				+
			
 
				+    # (Permission, expected scope flag attribute, category description)
			
 
				+    _SCOPE_CASES = [
			
 
				+        # can_read_status
			
 
				+        ("PRINTERS_READ", "can_read_status", "read printer status"),
			
 
				+        ("ARCHIVES_READ", "can_read_status", "read archives"),
			
 
				+        ("QUEUE_READ", "can_read_status", "read queue"),
			
 
				+        ("SETTINGS_READ", "can_read_status", "SpoolBuddy kiosk settings read"),
			
 
				+        ("WEBSOCKET_CONNECT", "can_read_status", "websocket subscribe"),
			
 
				+        # can_queue
			
 
				+        ("QUEUE_CREATE", "can_queue", "add queue item"),
			
 
				+        ("QUEUE_DELETE_ALL", "can_queue", "delete any queue item"),
			
 
				+        ("ARCHIVES_REPRINT_ALL", "can_queue", "reprint an archive"),
			
 
				+        # can_control_printer
			
 
				+        ("PRINTERS_CONTROL", "can_control_printer", "start/stop print"),
			
 
				+        ("PRINTERS_FILES", "can_control_printer", "send file to printer"),
			
 
				+        ("SMART_PLUGS_CONTROL", "can_control_printer", "smart plug on/off"),
			
 
				+        # can_manage_library
			
 
				+        ("LIBRARY_UPLOAD", "can_manage_library", "upload library file"),
			
 
				+        ("LIBRARY_DELETE_OWN", "can_manage_library", "delete own library file"),
			
 
				+        ("MAKERWORLD_IMPORT", "can_manage_library", "import from MakerWorld"),
			
 
				+        # can_manage_inventory
			
 
				+        ("INVENTORY_CREATE", "can_manage_inventory", "create spool record"),
			
 
				+        ("INVENTORY_UPDATE", "can_manage_inventory", "update spool / SpoolBuddy kiosk write"),
			
 
				+        ("INVENTORY_DELETE", "can_manage_inventory", "delete spool record"),
			
 
				+        ("INVENTORY_FORECAST_WRITE", "can_manage_inventory", "update forecast SKU settings"),
			
 
				+    ]
			
 
				+
			
 
				+    _ADMIN_CASES = [
			
 
				+        # Documented denylist
			
 
				+        "SETTINGS_UPDATE",
			
 
				+        "USERS_CREATE",
			
 
				+        "GROUPS_DELETE",
			
 
				+        "API_KEYS_CREATE",
			
 
				+        "GITHUB_BACKUP",
			
 
				+        "FIRMWARE_UPDATE",
			
 
				+        # Unmapped administrative (allowlist fail-closed catches these too)
			
 
				+        "PRINTERS_CREATE",
			
 
				+        "LIBRARY_DELETE_ALL",
			
 
				+        "LIBRARY_PURGE",
			
 
				+        "DISCOVERY_SCAN",
			
 
				+    ]
			
 
				+
			
 
				+    @pytest.mark.parametrize("perm_name,required_flag,_descr", _SCOPE_CASES)
			
 
				+    def test_permission_allowed_only_when_scope_flag_is_set(self, perm_name, required_flag, _descr):
			
 
				+        """For each (Permission, scope) case, true→allow and false→403."""
			
 
				+        from fastapi import HTTPException
			
 
				+
			
 
				+        from backend.app.core.auth import _check_apikey_permissions
			
 
				+        from backend.app.core.permissions import Permission
			
 
				+
			
 
				+        perm = Permission[perm_name].value
			
 
				+
			
 
				+        # Flag set → passes
			
 
				+        _check_apikey_permissions(_FakeApiKey(**{required_flag: True}), [perm])
			
 
				+
			
 
				+        # All flags off → 403
			
 
				+        with pytest.raises(HTTPException) as exc:
			
 
				+            _check_apikey_permissions(_FakeApiKey(), [perm])
			
 
				+        assert exc.value.status_code == 403
			
 
				+
			
 
				+        # Wrong flag set, required flag off → 403 (no cross-scope leakage)
			
 
				+        other_flags = {
			
 
				+            f
			
 
				+            for f in ("can_read_status", "can_queue", "can_control_printer", "can_manage_library")
			
 
				+            if f != required_flag
			
 
				+        }
			
 
				+        for other in other_flags:
			
 
				+            with pytest.raises(HTTPException) as exc:
			
 
				+                _check_apikey_permissions(_FakeApiKey(**{other: True}), [perm])
			
 
				+            assert exc.value.status_code == 403
			
 
				+
			
 
				+    @pytest.mark.parametrize("perm_name", _ADMIN_CASES)
			
 
				+    def test_admin_permissions_are_403_regardless_of_flags(self, perm_name):
			
 
				+        """A fully-flagged API key still cannot use administrative permissions."""
			
 
				+        from fastapi import HTTPException
			
 
				+
			
 
				+        from backend.app.core.auth import _check_apikey_permissions
			
 
				+        from backend.app.core.permissions import Permission
			
 
				+
			
 
				+        perm = Permission[perm_name].value
			
 
				+        all_flags = _FakeApiKey(can_read_status=True, can_queue=True, can_control_printer=True, can_manage_library=True)
			
 
				+        with pytest.raises(HTTPException) as exc:
			
 
				+            _check_apikey_permissions(all_flags, [perm])
			
 
				+        assert exc.value.status_code == 403
			
 
				+        assert "administrative" in exc.value.detail.lower() or "does not have" in exc.value.detail.lower()
			
 
				+
			
 
				+    def test_unknown_permission_string_is_admin_denied(self):
			
 
				+        """An unrecognised permission string must fail closed, not silently pass."""
			
 
				+        from fastapi import HTTPException
			
 
				+
			
 
				+        from backend.app.core.auth import _check_apikey_permissions
			
 
				+
			
 
				+        all_flags = _FakeApiKey(can_read_status=True, can_queue=True, can_control_printer=True, can_manage_library=True)
			
 
				+        with pytest.raises(HTTPException) as exc:
			
 
				+            _check_apikey_permissions(all_flags, ["bogus:nonexistent"])
			
 
				+        assert exc.value.status_code == 403
			
 
				+
			
 
				+    def test_empty_perm_list_is_403(self):
			
 
				+        """Defence-in-depth: an empty perm list must not silently allow."""
			
 
				+        from fastapi import HTTPException
			
 
				+
			
 
				+        from backend.app.core.auth import _check_apikey_permissions
			
 
				+
			
 
				+        all_flags = _FakeApiKey(can_read_status=True, can_queue=True, can_control_printer=True, can_manage_library=True)
			
 
				+        with pytest.raises(HTTPException) as exc:
			
 
				+            _check_apikey_permissions(all_flags, [])
			
 
				+        assert exc.value.status_code == 403
			
 
				+
			
 
				+    def test_require_any_at_least_one_must_pass(self):
			
 
				+        """``require_any=True`` matches any-of semantics, but still respects scopes."""
			
 
				+        from fastapi import HTTPException
			
 
				+
			
 
				+        from backend.app.core.auth import _check_apikey_permissions
			
 
				+        from backend.app.core.permissions import Permission
			
 
				+
			
 
				+        # can_read_status only: any-of (PRINTERS_READ, QUEUE_CREATE) passes because the read flag is set.
			
 
				+        _check_apikey_permissions(
			
 
				+            _FakeApiKey(can_read_status=True),
			
 
				+            [Permission.PRINTERS_READ.value, Permission.QUEUE_CREATE.value],
			
 
				+            require_any=True,
			
 
				+        )
			
 
				+        # No flags: any-of fails.
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            _check_apikey_permissions(
			
 
				+                _FakeApiKey(),
			
 
				+                [Permission.PRINTERS_READ.value, Permission.QUEUE_CREATE.value],
			
 
				+                require_any=True,
			
 
				+            )
			
 
				+        # All admin perms: any-of fails even with every flag set.
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            _check_apikey_permissions(
			
 
				+                _FakeApiKey(can_read_status=True, can_queue=True, can_control_printer=True, can_manage_library=True),
			
 
				+                [Permission.USERS_CREATE.value, Permission.GROUPS_DELETE.value],
			
 
				+                require_any=True,
			
 
				+            )
			
 
				+
			
 
				+    def test_require_all_every_perm_must_pass(self):
			
 
				+        """Default ``require_any=False``: every permission must pass — single failure → 403."""
			
 
				+        from fastapi import HTTPException
			
 
				+
			
 
				+        from backend.app.core.auth import _check_apikey_permissions
			
 
				+        from backend.app.core.permissions import Permission
			
 
				+
			
 
				+        # Read+queue set, queue+control required → fails because control flag is off.
			
 
				+        with pytest.raises(HTTPException) as exc:
			
 
				+            _check_apikey_permissions(
			
 
				+                _FakeApiKey(can_read_status=True, can_queue=True),
			
 
				+                [Permission.QUEUE_CREATE.value, Permission.PRINTERS_CONTROL.value],
			
 
				+            )
			
 
				+        assert exc.value.status_code == 403
			
--- a/backend/tests/integration/test_external_folders_api.py
+++ b/backend/tests/integration/test_external_folders_api.py
@@ -8,6 +8,21 @@ import pytest
 
				 from httpx import AsyncClient
			
 
				 
			
 
				 
			
 
				+@pytest.fixture(autouse=True)
			
 
				+def _enable_external_roots(monkeypatch, tmp_path):
			
 
				+    """Permit pytest's ``tmp_path`` tree as a valid external root.
			
 
				+
			
 
				+    After the GHSA-r2qv I1 fix, external folders are opt-in via the
			
 
				+    ``BAMBUDDY_EXTERNAL_ROOTS`` env var (empty by default → feature
			
 
				+    disabled). The test suite's external dirs live under pytest's
			
 
				+    per-session ``tmp_path`` root, which is a subtree of the OS tmp
			
 
				+    dir, so allowlisting the parent of ``tmp_path`` lets every test
			
 
				+    folder fixture pass the new validator. Autouse so individual tests
			
 
				+    don't have to know the env var exists.
			
 
				+    """
			
 
				+    monkeypatch.setenv("BAMBUDDY_EXTERNAL_ROOTS", str(tmp_path.parent))
			
 
				+
			
 
				+
			
 
				 class TestExternalFolderCreation:
			
 
				     """Tests for POST /library/folders/external."""
			
 
				 
			
@@ -53,11 +68,18 @@ class TestExternalFolderCreation:
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				-    async def test_create_external_folder_nonexistent_path(self, async_client: AsyncClient, db_session):
			
 
				-        """Verify 400 for non-existent path."""
			
 
				+    async def test_create_external_folder_nonexistent_path(self, async_client: AsyncClient, db_session, tmp_path):
			
 
				+        """Verify 400 for non-existent path within an allowed root.
			
 
				+
			
 
				+        After GHSA-r2qv I1 the allowlist check runs before the existence
			
 
				+        check, so the test path must be inside ``BAMBUDDY_EXTERNAL_ROOTS``
			
 
				+        (= ``tmp_path.parent`` per ``_enable_external_roots``) to actually
			
 
				+        exercise the existence branch rather than the allowlist branch.
			
 
				+        """
			
 
				+        bad_path = tmp_path / "nonexistent" / "subdir"
			
 
				         data = {
			
 
				             "name": "Bad Path",
			
 
				-            "external_path": "/nonexistent/path/that/does/not/exist",
			
 
				+            "external_path": str(bad_path),
			
 
				         }
			
 
				         response = await async_client.post("/api/v1/library/folders/external", json=data)
			
 
				         assert response.status_code == 400
			
@@ -65,15 +87,24 @@ class TestExternalFolderCreation:
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				-    async def test_create_external_folder_system_dir_blocked(self, async_client: AsyncClient, db_session):
			
 
				-        """Verify system directories are blocked."""
			
 
				+    async def test_create_external_folder_outside_allowlist_blocked(self, async_client: AsyncClient, db_session):
			
 
				+        """Paths outside ``BAMBUDDY_EXTERNAL_ROOTS`` are rejected (GHSA-r2qv I1).
			
 
				+
			
 
				+        Prior behaviour was a denylist (``/proc``, ``/sys``, ``/dev``, etc);
			
 
				+        anything not enumerated passed, including ``/data`` containing
			
 
				+        other users' archives. The allowlist replacement defaults to the
			
 
				+        empty set; this test confirms that a path outside the (tmp-path)
			
 
				+        allowlist set up by ``_enable_external_roots`` is rejected.
			
 
				+        ``/proc`` is the canonical example of a system directory that
			
 
				+        any operator allowlist would never legitimately include.
			
 
				+        """
			
 
				         data = {
			
 
				             "name": "System",
			
 
				             "external_path": "/proc",
			
 
				         }
			
 
				         response = await async_client.post("/api/v1/library/folders/external", json=data)
			
 
				         assert response.status_code == 400
			
 
				-        assert "system directory" in response.json()["detail"].lower()
			
 
				+        assert "not within an allowed external root" in response.json()["detail"].lower()
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
--- a/backend/tests/integration/test_library_api.py
+++ b/backend/tests/integration/test_library_api.py
@@ -285,22 +285,24 @@ class TestLibraryFilesAPI:
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				     async def test_rename_file_invalid_path_separator(self, async_client: AsyncClient, file_factory, db_session):
			
 
				-        """Verify file rename fails with path separators."""
			
 
				+        """Verify file rename fails with a forward slash (FAT32-illegal, #1540)."""
			
 
				         lib_file = await file_factory(filename="test.3mf")
			
 
				         data = {"filename": "path/to/file.3mf"}
			
 
				         response = await async_client.put(f"/api/v1/library/files/{lib_file.id}", json=data)
			
 
				         assert response.status_code == 400
			
 
				-        assert "path separator" in response.json()["detail"].lower()
			
 
				+        assert "invalid character" in response.json()["detail"].lower()
			
 
				+        assert "/" in response.json()["detail"]
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				     async def test_rename_file_invalid_backslash(self, async_client: AsyncClient, file_factory, db_session):
			
 
				-        """Verify file rename fails with backslash."""
			
 
				+        """Verify file rename fails with a backslash (FAT32-illegal, #1540)."""
			
 
				         lib_file = await file_factory(filename="test.3mf")
			
 
				         data = {"filename": "path\\to\\file.3mf"}
			
 
				         response = await async_client.put(f"/api/v1/library/files/{lib_file.id}", json=data)
			
 
				         assert response.status_code == 400
			
 
				-        assert "path separator" in response.json()["detail"].lower()
			
 
				+        assert "invalid character" in response.json()["detail"].lower()
			
 
				+        assert "\\" in response.json()["detail"]
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
@@ -1177,6 +1179,55 @@ class TestPrintFileUploadValidation:
 
				         result = response.json()
			
 
				         assert result["filename"] == "plate_1.gcode.3mf"
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_library_upload_classifies_gcode_3mf_as_compound(self, async_client: AsyncClient, db_session):
			
 
				+        """#1600 follow-up: upload path used to strip to the trailing
			
 
				+        extension and store ``file_type='3mf'`` for sliced outputs, while
			
 
				+        the external-folder scan stored ``file_type='gcode.3mf'``. Now
			
 
				+        every ingest path goes through ``classify_file_type`` and
			
 
				+        produces the canonical compound name."""
			
 
				+        files = {
			
 
				+            "file": (
			
 
				+                "sliced.gcode.3mf",
			
 
				+                self._valid_3mf_bytes(),
			
 
				+                "application/zip",
			
 
				+            )
			
 
				+        }
			
 
				+        response = await async_client.post("/api/v1/library/files", files=files)
			
 
				+        assert response.status_code == 200
			
 
				+        assert response.json()["file_type"] == "gcode.3mf"
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_library_get_gcode_endpoint_accepts_compound_file_type(self, async_client: AsyncClient, db_session):
			
 
				+        """#1600 follow-up: pre-fix, ``GET /files/{id}/gcode`` only handled
			
 
				+        ``file_type`` of ``gcode`` or ``3mf`` and 400'd on a row whose
			
 
				+        ``file_type`` was ``gcode.3mf`` — exactly the rows the external-
			
 
				+        folder scan was creating. The gate now treats both as 3MF and
			
 
				+        unzips the embedded gcode the same way."""
			
 
				+        from backend.app.models.library import LibraryFile
			
 
				+
			
 
				+        # Persist a real `.gcode.3mf` zip under file_type='gcode.3mf' so
			
 
				+        # the endpoint hits the new branch.
			
 
				+        with tempfile.NamedTemporaryFile(suffix=".gcode.3mf", delete=False) as tmp:
			
 
				+            tmp.write(self._valid_3mf_bytes(name="Metadata/plate_1.gcode"))
			
 
				+            tmp_path = tmp.name
			
 
				+
			
 
				+        lib_file = LibraryFile(
			
 
				+            filename="sliced.gcode.3mf",
			
 
				+            file_path=tmp_path,
			
 
				+            file_type="gcode.3mf",
			
 
				+            file_size=Path(tmp_path).stat().st_size,
			
 
				+        )
			
 
				+        db_session.add(lib_file)
			
 
				+        await db_session.commit()
			
 
				+        await db_session.refresh(lib_file)
			
 
				+
			
 
				+        response = await async_client.get(f"/api/v1/library/files/{lib_file.id}/gcode")
			
 
				+        assert response.status_code == 200
			
 
				+        assert b"G28" in response.content
			
 
				+
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				     async def test_library_still_accepts_non_print_extensions(self, async_client: AsyncClient, db_session):
			
--- a/backend/tests/integration/test_maintenance_api.py
+++ b/backend/tests/integration/test_maintenance_api.py
@@ -46,6 +46,31 @@ class TestMaintenanceTypesAPI:
 
				         assert result["name"] == "Custom Test Task"
			
 
				         assert result["is_system"] is False
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_create_custom_type_persists_wiki_url(self, async_client: AsyncClient):
			
 
				+        """#1596: pre-fix, the POST handler hard-coded every constructor field
			
 
				+        by name and silently dropped `wiki_url`. The schema accepted the value,
			
 
				+        the response echoed `null`, and the row landed without it. Pin the
			
 
				+        contract so the constructor doesn't drift again."""
			
 
				+        data = {
			
 
				+            "name": "Wiki URL Persistence Test",
			
 
				+            "default_interval_hours": 50.0,
			
 
				+            "interval_type": "hours",
			
 
				+            "wiki_url": "https://wiki.example.com/lubrication",
			
 
				+        }
			
 
				+        response = await async_client.post("/api/v1/maintenance/types", json=data)
			
 
				+        assert response.status_code == 200
			
 
				+        assert response.json()["wiki_url"] == "https://wiki.example.com/lubrication"
			
 
				+
			
 
				+        # Verify it persists through a separate GET round-trip — the POST
			
 
				+        # response could have echoed the request body without committing.
			
 
				+        list_response = await async_client.get("/api/v1/maintenance/types")
			
 
				+        assert list_response.status_code == 200
			
 
				+        matching = [t for t in list_response.json() if t["name"] == data["name"]]
			
 
				+        assert len(matching) == 1
			
 
				+        assert matching[0]["wiki_url"] == "https://wiki.example.com/lubrication"
			
 
				+
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				     async def test_update_maintenance_type(self, async_client: AsyncClient):
			
--- a/backend/tests/integration/test_mfa_api.py
+++ b/backend/tests/integration/test_mfa_api.py
@@ -4241,6 +4241,217 @@ class TestOIDCEmailResolutionExtra:
 
				         assert upd2.json()["email_claim"] == "preferred_username"
			
 
				 
			
 
				 
			
 
				+# ===========================================================================
			
 
				+# Issue #1569: standard 'email' claim fallback for User.email during
			
 
				+# auto-provisioning when email_claim is a non-email identity claim.
			
 
				+# ===========================================================================
			
 
				+
			
 
				+
			
 
				+class TestOIDCStandardEmailFallback:
			
 
				+    """Issue #1569: when email_claim is set to a non-email identity claim
			
 
				+    (e.g. preferred_username on Authentik) and the IdP token also carries a
			
 
				+    standard 'email' claim, auto-created users get User.email from the
			
 
				+    standard claim — without affecting the auto-link gate."""
			
 
				+
			
 
				+    async def _get_user_and_link(self, db_session: AsyncSession, provider_id: int, sub: str):
			
 
				+        from sqlalchemy import select
			
 
				+
			
 
				+        from backend.app.models.oidc_provider import UserOIDCLink
			
 
				+        from backend.app.models.user import User as UserModel
			
 
				+
			
 
				+        link_result = await db_session.execute(
			
 
				+            select(UserOIDCLink)
			
 
				+            .where(UserOIDCLink.provider_id == provider_id)
			
 
				+            .where(UserOIDCLink.provider_user_id == sub)
			
 
				+        )
			
 
				+        link = link_result.scalar_one_or_none()
			
 
				+        if link is None:
			
 
				+            return None, None
			
 
				+        user_result = await db_session.execute(select(UserModel).where(UserModel.id == link.user_id))
			
 
				+        return user_result.scalar_one_or_none(), link
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_email_claim_preferred_username_falls_back_to_standard_email(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        db_session: AsyncSession,
			
 
				+    ):
			
 
				+        """email_claim=preferred_username + both claims → username from preferred_username,
			
 
				+        email populated from the standard 'email' claim."""
			
 
				+        private_pem, jwks_data = _make_test_rsa_key()
			
 
				+        issuer = "https://issue1569-both.example"
			
 
				+        client_id = "issue1569-both-client"
			
 
				+
			
 
				+        admin_token = await _setup_and_login(async_client, "i1569b_adm", "I1569b123!")
			
 
				+        provider_id = await _create_provider_via_api(
			
 
				+            async_client,
			
 
				+            admin_token,
			
 
				+            issuer,
			
 
				+            client_id,
			
 
				+            email_claim="preferred_username",
			
 
				+            require_email_verified=False,
			
 
				+            suffix="i1569both",
			
 
				+        )
			
 
				+
			
 
				+        sub = f"sub-i1569-both-{secrets.token_hex(6)}"
			
 
				+        await _run_oidc_callback(
			
 
				+            async_client,
			
 
				+            db_session,
			
 
				+            provider_id=provider_id,
			
 
				+            claims={
			
 
				+                "sub": sub,
			
 
				+                "preferred_username": "jdoe",
			
 
				+                "email": "jdoe@example.com",
			
 
				+                "email_verified": True,
			
 
				+            },
			
 
				+            private_pem=private_pem,
			
 
				+            jwks_data=jwks_data,
			
 
				+            issuer=issuer,
			
 
				+            client_id=client_id,
			
 
				+        )
			
 
				+        db_session.expire_all()
			
 
				+        user, link = await self._get_user_and_link(db_session, provider_id, sub)
			
 
				+        assert user is not None and link is not None
			
 
				+        assert user.username == "jdoe"
			
 
				+        assert user.email == "jdoe@example.com"
			
 
				+        assert link.provider_email == "jdoe@example.com"
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_email_claim_preferred_username_no_standard_email_keeps_email_none(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        db_session: AsyncSession,
			
 
				+    ):
			
 
				+        """email_claim=preferred_username + no standard 'email' claim → behaviour unchanged:
			
 
				+        username derived from preferred_username, User.email stays None."""
			
 
				+        private_pem, jwks_data = _make_test_rsa_key()
			
 
				+        issuer = "https://issue1569-noemail.example"
			
 
				+        client_id = "issue1569-noemail-client"
			
 
				+
			
 
				+        admin_token = await _setup_and_login(async_client, "i1569n_adm", "I1569n123!")
			
 
				+        provider_id = await _create_provider_via_api(
			
 
				+            async_client,
			
 
				+            admin_token,
			
 
				+            issuer,
			
 
				+            client_id,
			
 
				+            email_claim="preferred_username",
			
 
				+            require_email_verified=False,
			
 
				+            suffix="i1569none",
			
 
				+        )
			
 
				+
			
 
				+        sub = f"sub-i1569-none-{secrets.token_hex(6)}"
			
 
				+        await _run_oidc_callback(
			
 
				+            async_client,
			
 
				+            db_session,
			
 
				+            provider_id=provider_id,
			
 
				+            claims={"sub": sub, "preferred_username": "jdoe2"},
			
 
				+            private_pem=private_pem,
			
 
				+            jwks_data=jwks_data,
			
 
				+            issuer=issuer,
			
 
				+            client_id=client_id,
			
 
				+        )
			
 
				+        db_session.expire_all()
			
 
				+        user, link = await self._get_user_and_link(db_session, provider_id, sub)
			
 
				+        assert user is not None and link is not None
			
 
				+        assert user.username == "jdoe2"
			
 
				+        assert user.email is None
			
 
				+        assert link.provider_email is None
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_fallback_respects_email_verified_false(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        db_session: AsyncSession,
			
 
				+    ):
			
 
				+        """email_claim=preferred_username + standard 'email' claim with email_verified=False
			
 
				+        → fallback drops the email (User.email None) — matches Fall B semantics."""
			
 
				+        private_pem, jwks_data = _make_test_rsa_key()
			
 
				+        issuer = "https://issue1569-evfalse.example"
			
 
				+        client_id = "issue1569-evfalse-client"
			
 
				+
			
 
				+        admin_token = await _setup_and_login(async_client, "i1569f_adm", "I1569f123!")
			
 
				+        provider_id = await _create_provider_via_api(
			
 
				+            async_client,
			
 
				+            admin_token,
			
 
				+            issuer,
			
 
				+            client_id,
			
 
				+            email_claim="preferred_username",
			
 
				+            require_email_verified=False,
			
 
				+            suffix="i1569evfalse",
			
 
				+        )
			
 
				+
			
 
				+        sub = f"sub-i1569-evfalse-{secrets.token_hex(6)}"
			
 
				+        await _run_oidc_callback(
			
 
				+            async_client,
			
 
				+            db_session,
			
 
				+            provider_id=provider_id,
			
 
				+            claims={
			
 
				+                "sub": sub,
			
 
				+                "preferred_username": "jdoe3",
			
 
				+                "email": "jdoe3@example.com",
			
 
				+                "email_verified": False,
			
 
				+            },
			
 
				+            private_pem=private_pem,
			
 
				+            jwks_data=jwks_data,
			
 
				+            issuer=issuer,
			
 
				+            client_id=client_id,
			
 
				+        )
			
 
				+        db_session.expire_all()
			
 
				+        user, link = await self._get_user_and_link(db_session, provider_id, sub)
			
 
				+        assert user is not None and link is not None
			
 
				+        assert user.username == "jdoe3"
			
 
				+        assert user.email is None
			
 
				+        assert link.provider_email is None
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_fallback_skipped_when_email_claim_is_email(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        db_session: AsyncSession,
			
 
				+    ):
			
 
				+        """email_claim='email' (default) — fallback path must NOT fire. Primary
			
 
				+        resolver result is authoritative; this guards against the fallback
			
 
				+        accidentally widening Fall-A/B semantics."""
			
 
				+        private_pem, jwks_data = _make_test_rsa_key()
			
 
				+        issuer = "https://issue1569-default.example"
			
 
				+        client_id = "issue1569-default-client"
			
 
				+
			
 
				+        admin_token = await _setup_and_login(async_client, "i1569d_adm", "I1569d123!")
			
 
				+        provider_id = await _create_provider_via_api(
			
 
				+            async_client,
			
 
				+            admin_token,
			
 
				+            issuer,
			
 
				+            client_id,
			
 
				+            email_claim="email",
			
 
				+            require_email_verified=True,
			
 
				+            suffix="i1569default",
			
 
				+        )
			
 
				+
			
 
				+        sub = f"sub-i1569-default-{secrets.token_hex(6)}"
			
 
				+        # email_verified absent → Fall A drops it. Fallback must NOT
			
 
				+        # re-instate the email since email_claim='email' is already the
			
 
				+        # primary path.
			
 
				+        await _run_oidc_callback(
			
 
				+            async_client,
			
 
				+            db_session,
			
 
				+            provider_id=provider_id,
			
 
				+            claims={"sub": sub, "email": "jdoe4@example.com"},
			
 
				+            private_pem=private_pem,
			
 
				+            jwks_data=jwks_data,
			
 
				+            issuer=issuer,
			
 
				+            client_id=client_id,
			
 
				+        )
			
 
				+        db_session.expire_all()
			
 
				+        user, link = await self._get_user_and_link(db_session, provider_id, sub)
			
 
				+        assert user is not None and link is not None
			
 
				+        assert user.email is None
			
 
				+        assert link.provider_email is None
			
 
				+
			
 
				+
			
 
				 # ===========================================================================
			
 
				 # E2E: Fall C (custom email claim) auto-link actually links existing user
			
 
				 # ===========================================================================
			
--- a/backend/tests/integration/test_projects_api.py
+++ b/backend/tests/integration/test_projects_api.py
@@ -287,10 +287,19 @@ class TestProjectPartsTracking:
 
				 
			
 
				     @pytest.fixture
			
 
				     async def archive_factory(self, db_session):
			
 
				-        """Factory to create test archives."""
			
 
				+        """Factory to create a test archive plus a matching PrintLogEntry.
			
 
				+
			
 
				+        Project stats aggregate from ``print_log_entries`` (#1593), so a
			
 
				+        test that only writes archives wouldn't exercise the production
			
 
				+        path — production always writes one log entry per run. The
			
 
				+        factory mirrors that: every archive whose status is anything other
			
 
				+        than ``"archived"`` (file shelved without printing) gets a log
			
 
				+        entry whose status matches the archive.
			
 
				+        """
			
 
				 
			
 
				         async def _create_archive(**kwargs):
			
 
				             from backend.app.models.archive import PrintArchive
			
 
				+            from backend.app.models.print_log import PrintLogEntry
			
 
				 
			
 
				             defaults = {
			
 
				                 "filename": "test.3mf",
			
@@ -306,6 +315,16 @@ class TestProjectPartsTracking:
 
				             db_session.add(archive)
			
 
				             await db_session.commit()
			
 
				             await db_session.refresh(archive)
			
 
				+
			
 
				+            if archive.status != "archived":
			
 
				+                db_session.add(
			
 
				+                    PrintLogEntry(
			
 
				+                        archive_id=archive.id,
			
 
				+                        print_name=archive.print_name,
			
 
				+                        status=archive.status,
			
 
				+                    )
			
 
				+                )
			
 
				+                await db_session.commit()
			
 
				             return archive
			
 
				 
			
 
				         return _create_archive
			
@@ -436,10 +455,12 @@ class TestProjectArchivedStatusNotCounted:
 
				 
			
 
				     @pytest.fixture
			
 
				     async def archive_factory(self, db_session):
			
 
				-        """Factory to create test archives."""
			
 
				+        """Factory to create a test archive plus a matching PrintLogEntry —
			
 
				+        see TestProjectPartsTracking.archive_factory for rationale (#1593)."""
			
 
				 
			
 
				         async def _create_archive(**kwargs):
			
 
				             from backend.app.models.archive import PrintArchive
			
 
				+            from backend.app.models.print_log import PrintLogEntry
			
 
				 
			
 
				             defaults = {
			
 
				                 "filename": "test.3mf",
			
@@ -455,6 +476,16 @@ class TestProjectArchivedStatusNotCounted:
 
				             db_session.add(archive)
			
 
				             await db_session.commit()
			
 
				             await db_session.refresh(archive)
			
 
				+
			
 
				+            if archive.status != "archived":
			
 
				+                db_session.add(
			
 
				+                    PrintLogEntry(
			
 
				+                        archive_id=archive.id,
			
 
				+                        print_name=archive.print_name,
			
 
				+                        status=archive.status,
			
 
				+                    )
			
 
				+                )
			
 
				+                await db_session.commit()
			
 
				             return archive
			
 
				 
			
 
				         return _create_archive
			
@@ -499,7 +530,10 @@ class TestProjectArchivedStatusNotCounted:
 
				         our_project = next((p for p in data if p["name"] == "List Archived Test"), None)
			
 
				         assert our_project is not None
			
 
				         assert our_project["completed_count"] == 4  # Only completed, not archived
			
 
				-        assert our_project["archive_count"] == 2  # Both archives exist as plates
			
 
				+        # Post-#1593: archive_count is "print runs", not "files attached". An
			
 
				+        # ``archived``-status file (shelved without printing) has no
			
 
				+        # PrintLogEntry and doesn't count — only the actual printed run does.
			
 
				+        assert our_project["archive_count"] == 1
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
@@ -519,9 +553,201 @@ class TestProjectArchivedStatusNotCounted:
 
				         data = response.json()
			
 
				 
			
 
				         assert data["stats"]["completed_prints"] == 10  # Only "completed"
			
 
				-        assert data["stats"]["failed_prints"] == 2  # failed + aborted (count of archives, not sum)
			
 
				-        assert data["stats"]["total_archives"] == 4  # All archives
			
 
				-        assert data["stats"]["total_items"] == 20  # Sum of all quantities
			
 
				+        assert data["stats"]["failed_prints"] == 2  # failed + aborted (count of runs)
			
 
				+        # Post-#1593: total_archives counts runs from print_log_entries, not
			
 
				+        # files. The ``archived`` row is a shelved file with no run, so it
			
 
				+        # contributes 0; the other three (completed, failed, aborted) each
			
 
				+        # produced a run.
			
 
				+        assert data["stats"]["total_archives"] == 3
			
 
				+        # total_items sums quantity per run: 10 (completed) + 3 (failed) + 2 (aborted) = 15
			
 
				+        assert data["stats"]["total_items"] == 15
			
 
				+
			
 
				+
			
 
				+class TestProjectStatsPerRun:
			
 
				+    """Project stats aggregate per-run from ``print_log_entries`` so
			
 
				+    reprints and multi-plate prints count every run (#1593). Pre-fix the
			
 
				+    stats counted ``print_archives`` (one row per file), so 3 reprints of
			
 
				+    one file showed as 1 job with plate-1-only filament/time/cost.
			
 
				+    """
			
 
				+
			
 
				+    @pytest.fixture
			
 
				+    async def project_factory(self, db_session):
			
 
				+        async def _create_project(**kwargs):
			
 
				+            from backend.app.models.project import Project
			
 
				+
			
 
				+            defaults = {"name": "Per-Run Stats Project", "color": "#FF0000"}
			
 
				+            defaults.update(kwargs)
			
 
				+            project = Project(**defaults)
			
 
				+            db_session.add(project)
			
 
				+            await db_session.commit()
			
 
				+            await db_session.refresh(project)
			
 
				+            return project
			
 
				+
			
 
				+        return _create_project
			
 
				+
			
 
				+    @pytest.fixture
			
 
				+    async def archive_with_runs(self, db_session):
			
 
				+        """Build a single archive + N PrintLogEntry rows.
			
 
				+
			
 
				+        Models the reporter's case: one source file (archive) is reprinted
			
 
				+        N times, each run with its own duration / filament / cost.
			
 
				+        """
			
 
				+
			
 
				+        async def _create(*, project_id: int, runs: list[dict], archive_status: str = "completed", quantity: int = 1):
			
 
				+            from backend.app.models.archive import PrintArchive
			
 
				+            from backend.app.models.print_log import PrintLogEntry
			
 
				+
			
 
				+            archive = PrintArchive(
			
 
				+                filename="reprinted.3mf",
			
 
				+                file_path="test/reprinted.3mf",
			
 
				+                file_size=1000,
			
 
				+                print_name="Reprinted Print",
			
 
				+                status=archive_status,
			
 
				+                quantity=quantity,
			
 
				+                project_id=project_id,
			
 
				+            )
			
 
				+            db_session.add(archive)
			
 
				+            await db_session.commit()
			
 
				+            await db_session.refresh(archive)
			
 
				+
			
 
				+            for run in runs:
			
 
				+                db_session.add(
			
 
				+                    PrintLogEntry(
			
 
				+                        archive_id=archive.id,
			
 
				+                        print_name=archive.print_name,
			
 
				+                        status=run.get("status", "completed"),
			
 
				+                        duration_seconds=run.get("duration_seconds"),
			
 
				+                        filament_used_grams=run.get("filament_used_grams"),
			
 
				+                        cost=run.get("cost"),
			
 
				+                        energy_kwh=run.get("energy_kwh"),
			
 
				+                        energy_cost=run.get("energy_cost"),
			
 
				+                    )
			
 
				+                )
			
 
				+            await db_session.commit()
			
 
				+            return archive
			
 
				+
			
 
				+        return _create
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_three_reprints_count_as_three_jobs_with_summed_totals(
			
 
				+        self, async_client: AsyncClient, project_factory, archive_with_runs
			
 
				+    ):
			
 
				+        """Reporter's case: 3 runs of one multi-plate file should report
			
 
				+        3 jobs and summed time / filament / cost — pre-fix it reported 1
			
 
				+        job with plate-1-only totals."""
			
 
				+        project = await project_factory()
			
 
				+        await archive_with_runs(
			
 
				+            project_id=project.id,
			
 
				+            runs=[
			
 
				+                {"duration_seconds": 7140, "filament_used_grams": 19.2, "cost": 0.40},
			
 
				+                {"duration_seconds": 6000, "filament_used_grams": 20.0, "cost": 0.40},
			
 
				+                {"duration_seconds": 6300, "filament_used_grams": 18.8, "cost": 0.40},
			
 
				+            ],
			
 
				+        )
			
 
				+
			
 
				+        response = await async_client.get(f"/api/v1/projects/{project.id}")
			
 
				+        assert response.status_code == 200
			
 
				+        stats = response.json()["stats"]
			
 
				+
			
 
				+        assert stats["total_archives"] == 3, "3 runs must show as 3 jobs"
			
 
				+        assert stats["completed_prints"] == 3, "Each run with quantity=1 contributes 1 part"
			
 
				+        assert stats["total_filament_grams"] == round(19.2 + 20.0 + 18.8, 2)
			
 
				+        assert stats["total_print_time_hours"] == round((7140 + 6000 + 6300) / 3600, 2)
			
 
				+        # Cost rounds at 2 decimals — 3 * 0.40 = 1.20
			
 
				+        assert stats["estimated_cost"] == 1.20
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_orphan_log_entries_do_not_bleed_into_projects(
			
 
				+        self, async_client: AsyncClient, project_factory, db_session
			
 
				+    ):
			
 
				+        """Log rows whose ``archive_id`` is NULL (archive deleted via
			
 
				+        ON DELETE SET NULL) must not leak into any project — the inner
			
 
				+        join filters them out by construction."""
			
 
				+        from backend.app.models.print_log import PrintLogEntry
			
 
				+
			
 
				+        project = await project_factory()
			
 
				+
			
 
				+        # Orphan log entries — no archive_id.
			
 
				+        for _ in range(5):
			
 
				+            db_session.add(
			
 
				+                PrintLogEntry(
			
 
				+                    archive_id=None,
			
 
				+                    print_name="Orphan Run",
			
 
				+                    status="completed",
			
 
				+                    duration_seconds=3600,
			
 
				+                    filament_used_grams=20.0,
			
 
				+                    cost=0.5,
			
 
				+                )
			
 
				+            )
			
 
				+        await db_session.commit()
			
 
				+
			
 
				+        response = await async_client.get(f"/api/v1/projects/{project.id}")
			
 
				+        assert response.status_code == 200
			
 
				+        stats = response.json()["stats"]
			
 
				+
			
 
				+        # None of the orphan rows are attributable to this project.
			
 
				+        assert stats["total_archives"] == 0
			
 
				+        assert stats["completed_prints"] == 0
			
 
				+        assert stats["total_filament_grams"] == 0
			
 
				+        assert stats["total_print_time_hours"] == 0
			
 
				+        assert stats["estimated_cost"] == 0
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_mixed_run_outcomes_split_completed_and_failed(
			
 
				+        self, async_client: AsyncClient, project_factory, archive_with_runs
			
 
				+    ):
			
 
				+        """A multi-run archive with mixed outcomes splits cleanly between
			
 
				+        completed_prints (per-quantity) and failed_prints (per-run)."""
			
 
				+        project = await project_factory()
			
 
				+        await archive_with_runs(
			
 
				+            project_id=project.id,
			
 
				+            quantity=2,
			
 
				+            runs=[
			
 
				+                {"status": "completed", "filament_used_grams": 30.0},
			
 
				+                {"status": "completed", "filament_used_grams": 30.0},
			
 
				+                {"status": "failed", "filament_used_grams": 5.0},
			
 
				+                {"status": "aborted", "filament_used_grams": 2.0},
			
 
				+            ],
			
 
				+        )
			
 
				+
			
 
				+        response = await async_client.get(f"/api/v1/projects/{project.id}")
			
 
				+        stats = response.json()["stats"]
			
 
				+
			
 
				+        assert stats["total_archives"] == 4
			
 
				+        # 2 completed runs × quantity=2 each = 4 parts
			
 
				+        assert stats["completed_prints"] == 4
			
 
				+        # 2 failure runs (failed + aborted) count as 2, not 2*quantity
			
 
				+        assert stats["failed_prints"] == 2
			
 
				+        # All 4 runs contribute filament: 30 + 30 + 5 + 2 = 67
			
 
				+        assert stats["total_filament_grams"] == 67.0
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_quick_stats_in_list_view_agree_with_per_project_stats(
			
 
				+        self, async_client: AsyncClient, project_factory, archive_with_runs
			
 
				+    ):
			
 
				+        """The /projects list view's quick stats must agree with
			
 
				+        /projects/{id}'s detailed stats — both come from the same per-run
			
 
				+        aggregation."""
			
 
				+        project = await project_factory(name="Quick-Stats Alignment")
			
 
				+        await archive_with_runs(
			
 
				+            project_id=project.id,
			
 
				+            quantity=1,
			
 
				+            runs=[
			
 
				+                {"status": "completed"},
			
 
				+                {"status": "completed"},
			
 
				+                {"status": "failed"},
			
 
				+            ],
			
 
				+        )
			
 
				+
			
 
				+        list_resp = await async_client.get("/api/v1/projects/")
			
 
				+        ours = next(p for p in list_resp.json() if p["name"] == "Quick-Stats Alignment")
			
 
				+        assert ours["archive_count"] == 3
			
 
				+        assert ours["completed_count"] == 2
			
 
				+        assert ours["failed_count"] == 1
			
 
				 
			
 
				 
			
 
				 class TestProjectArchivesAPI:
			
@@ -953,3 +1179,122 @@ class TestProjectExportImport:
 
				         response = await async_client.post("/api/v1/projects/import/file", files=files)
			
 
				         assert response.status_code == 400
			
 
				         assert "Invalid JSON" in response.json()["detail"]
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_import_rejects_absolute_path_in_folder_name(self, async_client: AsyncClient, tmp_path):
			
 
				+        """Absolute paths in `linked_folders[*].name` must not escape library_dir.
			
 
				+
			
 
				+        Verbatim shape from the upstream advisory: attacker sets folder name to
			
 
				+        an absolute path, expecting Python's ``Path("/lib") / "/anywhere"`` to
			
 
				+        collapse to ``Path("/anywhere")`` and let the next file write land
			
 
				+        outside the library directory.
			
 
				+        """
			
 
				+        import io
			
 
				+        import json
			
 
				+        import zipfile
			
 
				+
			
 
				+        target_outside = tmp_path / "outside" / "owned"
			
 
				+        # Build a ZIP whose folder name points outside library_dir entirely.
			
 
				+        zip_buffer = io.BytesIO()
			
 
				+        with zipfile.ZipFile(zip_buffer, "w", zipfile.ZIP_DEFLATED) as zf:
			
 
				+            zf.writestr(
			
 
				+                "project.json",
			
 
				+                json.dumps(
			
 
				+                    {
			
 
				+                        "name": "innocent",
			
 
				+                        "linked_folders": [{"name": str(target_outside)}],
			
 
				+                    }
			
 
				+                ),
			
 
				+            )
			
 
				+            zf.writestr(f"files/{target_outside}/evil.pth", b"import os; os.system('echo pwned > /tmp/owned')\n")
			
 
				+
			
 
				+        zip_buffer.seek(0)
			
 
				+        files = {"file": ("evil.zip", zip_buffer, "application/zip")}
			
 
				+        response = await async_client.post("/api/v1/projects/import/file", files=files)
			
 
				+        assert response.status_code == 400, response.text
			
 
				+        assert not target_outside.exists(), "Attacker payload landed outside library_dir"
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_import_rejects_dotdot_in_folder_name(self, async_client: AsyncClient):
			
 
				+        """`..` segments in folder name must be rejected."""
			
 
				+        import io
			
 
				+        import json
			
 
				+        import zipfile
			
 
				+
			
 
				+        zip_buffer = io.BytesIO()
			
 
				+        with zipfile.ZipFile(zip_buffer, "w", zipfile.ZIP_DEFLATED) as zf:
			
 
				+            zf.writestr(
			
 
				+                "project.json",
			
 
				+                json.dumps(
			
 
				+                    {
			
 
				+                        "name": "innocent",
			
 
				+                        "linked_folders": [{"name": "../../../etc"}],
			
 
				+                    }
			
 
				+                ),
			
 
				+            )
			
 
				+            zf.writestr("files/../../../etc/x.txt", b"x")
			
 
				+
			
 
				+        zip_buffer.seek(0)
			
 
				+        files = {"file": ("evil.zip", zip_buffer, "application/zip")}
			
 
				+        response = await async_client.post("/api/v1/projects/import/file", files=files)
			
 
				+        assert response.status_code == 400, response.text
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_import_rejects_dotdot_in_relative_path(self, async_client: AsyncClient):
			
 
				+        """`..` segments in the per-entry path (Vector B in the advisory) must
			
 
				+        be rejected even when the folder name itself is fine."""
			
 
				+        import io
			
 
				+        import json
			
 
				+        import zipfile
			
 
				+
			
 
				+        zip_buffer = io.BytesIO()
			
 
				+        with zipfile.ZipFile(zip_buffer, "w", zipfile.ZIP_DEFLATED) as zf:
			
 
				+            zf.writestr(
			
 
				+                "project.json",
			
 
				+                json.dumps(
			
 
				+                    {
			
 
				+                        "name": "innocent",
			
 
				+                        "linked_folders": [{"name": "ok"}],
			
 
				+                    }
			
 
				+                ),
			
 
				+            )
			
 
				+            # Folder name is benign, but the file path inside attempts to
			
 
				+            # escape via ``..``.
			
 
				+            zf.writestr("files/ok/../../../etc/x.txt", b"x")
			
 
				+
			
 
				+        zip_buffer.seek(0)
			
 
				+        files = {"file": ("evil.zip", zip_buffer, "application/zip")}
			
 
				+        response = await async_client.post("/api/v1/projects/import/file", files=files)
			
 
				+        assert response.status_code == 400, response.text
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_import_legit_nested_zip_still_works(self, async_client: AsyncClient):
			
 
				+        """A legitimate ZIP with a nested file path inside the folder must
			
 
				+        continue to import cleanly. Guards against the fix being over-strict."""
			
 
				+        import io
			
 
				+        import json
			
 
				+        import zipfile
			
 
				+
			
 
				+        zip_buffer = io.BytesIO()
			
 
				+        with zipfile.ZipFile(zip_buffer, "w", zipfile.ZIP_DEFLATED) as zf:
			
 
				+            zf.writestr(
			
 
				+                "project.json",
			
 
				+                json.dumps(
			
 
				+                    {
			
 
				+                        "name": "nested-ok",
			
 
				+                        "linked_folders": [{"name": "OkFolder"}],
			
 
				+                    }
			
 
				+                ),
			
 
				+            )
			
 
				+            zf.writestr("files/OkFolder/sub/dir/inside.txt", b"hello")
			
 
				+
			
 
				+        zip_buffer.seek(0)
			
 
				+        files = {"file": ("nested.zip", zip_buffer, "application/zip")}
			
 
				+        response = await async_client.post("/api/v1/projects/import/file", files=files)
			
 
				+        assert response.status_code == 200, response.text
			
 
				+        data = response.json()
			
 
				+        assert data["name"] == "nested-ok"
			
--- a/backend/tests/integration/test_spoolbuddy.py
+++ b/backend/tests/integration/test_spoolbuddy.py
@@ -1608,6 +1608,39 @@ class TestUpdateSpoolWeightSpoolman:
 
				         assert resp.status_code == 200
			
 
				         assert resp.json()["weight_used"] == 500
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_stale_local_row_does_not_shadow_spoolman(
			
 
				+        self, async_client: AsyncClient, db_session, spool_factory, spoolman_settings
			
 
				+    ):
			
 
				+        """Regression for #1530: when Spoolman mode is on, a stale local Spool
			
 
				+        sharing the same numeric id must NOT absorb the update — Spoolman is
			
 
				+        the authoritative target."""
			
 
				+        local_spool = await spool_factory(label_weight=1000, core_weight=250, weight_used=0)
			
 
				+        # Spoolman spool with the SAME numeric id as the local stale row.
			
 
				+        sm_spool = _spoolman_spool_fixture(local_spool.id, spool_weight=250.0, filament_weight=1000.0)
			
 
				+        mock_client = _mock_spoolman_client()
			
 
				+        mock_client.get_spool = AsyncMock(return_value=sm_spool)
			
 
				+        mock_client.update_spool = AsyncMock(return_value=sm_spool)
			
 
				+
			
 
				+        with (
			
 
				+            patch("backend.app.services.spoolman.get_spoolman_client", AsyncMock(return_value=mock_client)),
			
 
				+            patch("backend.app.services.spoolman.init_spoolman_client", AsyncMock(return_value=mock_client)),
			
 
				+        ):
			
 
				+            resp = await async_client.post(
			
 
				+                f"{API}/scale/update-spool-weight",
			
 
				+                json={"spool_id": local_spool.id, "weight_grams": 750},
			
 
				+            )
			
 
				+
			
 
				+        assert resp.status_code == 200
			
 
				+        # Spoolman got the update.
			
 
				+        mock_client.update_spool.assert_called_once_with(spool_id=local_spool.id, remaining_weight=pytest.approx(500.0))
			
 
				+        # Local row is untouched — the bug was that the local update silently
			
 
				+        # absorbed the request while Spoolman stayed stale.
			
 
				+        await db_session.refresh(local_spool)
			
 
				+        assert local_spool.weight_used == 0
			
 
				+        assert local_spool.last_scale_weight is None
			
 
				+
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				     async def test_spool_level_spool_weight_takes_priority(self, async_client: AsyncClient, spoolman_settings):
			
--- a/backend/tests/integration/test_system_api.py
+++ b/backend/tests/integration/test_system_api.py
@@ -219,10 +219,32 @@ class TestSystemAPI:
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				     async def test_system_info_with_archives(self, async_client: AsyncClient, printer_factory, archive_factory):
			
 
				-        """Verify database stats include archive counts."""
			
 
				+        """Verify database stats include archive counts.
			
 
				+
			
 
				+        Post-#1593 `total_print_time_seconds` is summed from
			
 
				+        `PrintLogEntry.duration_seconds` (the *actual* per-run duration),
			
 
				+        not `PrintArchive.print_time_seconds` (the slicer estimate). The
			
 
				+        archive_factory derives the run's duration from
			
 
				+        ``completed_at - started_at`` on the archive, so the test sets
			
 
				+        those so each run carries a duration the system route can sum.
			
 
				+        """
			
 
				+        from datetime import datetime, timezone
			
 
				+
			
 
				         printer = await printer_factory()
			
 
				-        await archive_factory(printer.id, status="completed", print_time_seconds=3600)
			
 
				-        await archive_factory(printer.id, status="failed", print_time_seconds=1800)
			
 
				+        await archive_factory(
			
 
				+            printer.id,
			
 
				+            status="completed",
			
 
				+            print_time_seconds=3600,
			
 
				+            started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 1, 11, 0, tzinfo=timezone.utc),
			
 
				+        )
			
 
				+        await archive_factory(
			
 
				+            printer.id,
			
 
				+            status="failed",
			
 
				+            print_time_seconds=1800,
			
 
				+            started_at=datetime(2026, 5, 2, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 2, 10, 30, tzinfo=timezone.utc),
			
 
				+        )
			
 
				 
			
 
				         with (
			
 
				             patch("backend.app.api.routes.system.psutil") as mock_psutil,
			
--- a/backend/tests/integration/test_virtual_printer_api.py
+++ b/backend/tests/integration/test_virtual_printer_api.py
@@ -61,33 +61,46 @@ class TestVirtualPrinterSettingsAPI:
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				-    async def test_update_mode_to_print_queue(self, async_client: AsyncClient):
			
 
				-        """Verify mode can be set to print_queue."""
			
 
				-        response = await async_client.put("/api/v1/settings/virtual-printer?mode=print_queue")
			
 
				+    async def test_update_mode_to_queue(self, async_client: AsyncClient):
			
 
				+        """Verify mode can be set to the canonical 'queue' value."""
			
 
				+        response = await async_client.put("/api/v1/settings/virtual-printer?mode=queue")
			
 
				 
			
 
				         assert response.status_code == 200
			
 
				         result = response.json()
			
 
				-        assert result["mode"] == "print_queue"
			
 
				+        assert result["mode"] == "queue"
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				-    async def test_update_mode_legacy_queue_maps_to_review(self, async_client: AsyncClient):
			
 
				-        """Verify legacy 'queue' mode is normalized to 'review'."""
			
 
				-        response = await async_client.put("/api/v1/settings/virtual-printer?mode=queue")
			
 
				+    async def test_update_mode_legacy_print_queue_normalises_to_queue(self, async_client: AsyncClient):
			
 
				+        """Legacy `print_queue` is accepted on input and translated to `queue` on
			
 
				+        storage so the UI button label and the support-bundle field agree
			
 
				+        (#1429 mode-label discrepancy)."""
			
 
				+        response = await async_client.put("/api/v1/settings/virtual-printer?mode=print_queue")
			
 
				 
			
 
				         assert response.status_code == 200
			
 
				         result = response.json()
			
 
				-        assert result["mode"] == "review"  # Legacy queue maps to review
			
 
				+        assert result["mode"] == "queue"
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
 
				-    async def test_update_mode_to_immediate(self, async_client: AsyncClient):
			
 
				-        """Verify mode can be set to immediate."""
			
 
				+    async def test_update_mode_legacy_immediate_normalises_to_archive(self, async_client: AsyncClient):
			
 
				+        """Legacy `immediate` is accepted on input and translated to `archive`
			
 
				+        on storage (#1429 mode-label discrepancy)."""
			
 
				         response = await async_client.put("/api/v1/settings/virtual-printer?mode=immediate")
			
 
				 
			
 
				         assert response.status_code == 200
			
 
				         result = response.json()
			
 
				-        assert result["mode"] == "immediate"
			
 
				+        assert result["mode"] == "archive"
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_update_mode_to_archive(self, async_client: AsyncClient):
			
 
				+        """Verify mode can be set to the canonical 'archive' value."""
			
 
				+        response = await async_client.put("/api/v1/settings/virtual-printer?mode=archive")
			
 
				+
			
 
				+        assert response.status_code == 200
			
 
				+        result = response.json()
			
 
				+        assert result["mode"] == "archive"
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     @pytest.mark.integration
			
@@ -136,7 +149,7 @@ class TestVirtualPrinterSettingsAPI:
 
				                 return_value={
			
 
				                     "enabled": True,
			
 
				                     "running": True,
			
 
				-                    "mode": "immediate",
			
 
				+                    "mode": "archive",
			
 
				                     "name": "Bambuddy",
			
 
				                     "serial": "00M09A391800001",
			
 
				                     "pending_files": 0,
			
@@ -157,7 +170,7 @@ class TestVirtualPrinterSettingsAPI:
 
				                 return_value={
			
 
				                     "enabled": False,
			
 
				                     "running": False,
			
 
				-                    "mode": "immediate",
			
 
				+                    "mode": "archive",
			
 
				                     "name": "Bambuddy",
			
 
				                     "serial": "00M09A391800001",
			
 
				                     "pending_files": 0,
			
@@ -283,7 +296,7 @@ class TestVirtualPrinterAutoDispatchAPI:
 
				             "/api/v1/virtual-printers",
			
 
				             json={
			
 
				                 "name": "TestDefaultDispatch",
			
 
				-                "mode": "print_queue",
			
 
				+                "mode": "queue",
			
 
				                 "access_code": "12345678",
			
 
				             },
			
 
				         )
			
@@ -300,7 +313,7 @@ class TestVirtualPrinterAutoDispatchAPI:
 
				             "/api/v1/virtual-printers",
			
 
				             json={
			
 
				                 "name": "TestManualDispatch",
			
 
				-                "mode": "print_queue",
			
 
				+                "mode": "queue",
			
 
				                 "access_code": "12345678",
			
 
				                 "auto_dispatch": False,
			
 
				             },
			
@@ -319,7 +332,7 @@ class TestVirtualPrinterAutoDispatchAPI:
 
				             "/api/v1/virtual-printers",
			
 
				             json={
			
 
				                 "name": "TestToggleDispatch",
			
 
				-                "mode": "print_queue",
			
 
				+                "mode": "queue",
			
 
				                 "access_code": "12345678",
			
 
				             },
			
 
				         )
			
@@ -359,7 +372,7 @@ class TestVirtualPrinterTailscaleToggleAPI:
 
				             "/api/v1/virtual-printers",
			
 
				             json={
			
 
				                 "name": "TestTailscaleToggle",
			
 
				-                "mode": "immediate",
			
 
				+                "mode": "archive",
			
 
				                 "access_code": "12345678",
			
 
				             },
			
 
				         )
			
@@ -426,7 +439,7 @@ class TestVirtualPrinterDiagnosticAPI:
 
				         """A freshly created (disabled) VP fails the 'enabled' check."""
			
 
				         create_resp = await async_client.post(
			
 
				             "/api/v1/virtual-printers",
			
 
				-            json={"name": "TestDiagVP", "mode": "immediate", "access_code": "12345678"},
			
 
				+            json={"name": "TestDiagVP", "mode": "archive", "access_code": "12345678"},
			
 
				         )
			
 
				         assert create_resp.status_code == 200
			
 
				         vp_id = create_resp.json()["id"]
			
--- a/backend/tests/integration/test_webhook_printer_status.py
+++ b/backend/tests/integration/test_webhook_printer_status.py
@@ -0,0 +1,225 @@
 
				+"""Regression tests for the webhook printer-status / stop / cancel routes.
			
 
				+
			
 
				+Pre-fix the routes treated ``printer_manager.get_status(...)``'s return value
			
 
				+as a dict and called ``.get(...)`` on it. The return is a ``PrinterState``
			
 
				+dataclass (``backend/app/services/bambu_mqtt.py``), so the call raised
			
 
				+``AttributeError`` and surfaced as a generic 500 for any printer that
			
 
				+actually had a status row. See #1584.
			
 
				+"""
			
 
				+
			
 
				+from unittest.mock import MagicMock, patch
			
 
				+
			
 
				+import pytest
			
 
				+from httpx import AsyncClient
			
 
				+
			
 
				+from backend.app.services.bambu_mqtt import PrinterState
			
 
				+
			
 
				+
			
 
				+@pytest.fixture
			
 
				+async def api_key_data(async_client: AsyncClient, db_session):
			
 
				+    """API key with read_status + control_printer scopes — covers status,
			
 
				+    stop, and cancel in a single fixture."""
			
 
				+    from backend.app.core.auth import generate_api_key
			
 
				+    from backend.app.models.api_key import APIKey
			
 
				+
			
 
				+    full_key, key_hash, key_prefix = generate_api_key()
			
 
				+    api_key = APIKey(
			
 
				+        name="webhook-status-test-key",
			
 
				+        key_hash=key_hash,
			
 
				+        key_prefix=key_prefix,
			
 
				+        can_read_status=True,
			
 
				+        can_control_printer=True,
			
 
				+        enabled=True,
			
 
				+    )
			
 
				+    db_session.add(api_key)
			
 
				+    await db_session.commit()
			
 
				+    return full_key
			
 
				+
			
 
				+
			
 
				+@pytest.fixture
			
 
				+async def printer_row(db_session):
			
 
				+    from backend.app.models.printer import Printer
			
 
				+
			
 
				+    printer = Printer(
			
 
				+        name="StatusTest",
			
 
				+        ip_address="192.168.1.44",
			
 
				+        access_code="12345678",
			
 
				+        serial_number="00M00A000000010",
			
 
				+        model="P1S",
			
 
				+    )
			
 
				+    db_session.add(printer)
			
 
				+    await db_session.commit()
			
 
				+    return printer
			
 
				+
			
 
				+
			
 
				+class TestWebhookGetPrinterStatus:
			
 
				+    """``GET /api/v1/webhook/printer/{id}/status`` — the route reads the
			
 
				+    dataclass via attribute access, not ``.get(...)``. Pre-fix the call
			
 
				+    raised AttributeError → 500 for every printer with a status row.
			
 
				+    """
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_200_with_connected_dataclass_status(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+        printer_row,
			
 
				+    ):
			
 
				+        """A live PrinterState dataclass must yield a 200 with the
			
 
				+        attributes mapped into the response — this is the exact regression
			
 
				+        from #1584 where the dataclass crashed the ``.get(...)`` calls."""
			
 
				+        state = PrinterState(
			
 
				+            connected=True,
			
 
				+            state="RUNNING",
			
 
				+            current_print="bench.3mf",
			
 
				+            progress=42.0,
			
 
				+            remaining_time=1234,
			
 
				+        )
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.webhook.printer_manager.get_status",
			
 
				+            MagicMock(return_value=state),
			
 
				+        ):
			
 
				+            resp = await async_client.get(
			
 
				+                f"/api/v1/webhook/printer/{printer_row.id}/status",
			
 
				+                headers={"X-API-Key": api_key_data},
			
 
				+            )
			
 
				+
			
 
				+        assert resp.status_code == 200, resp.text
			
 
				+        body = resp.json()
			
 
				+        assert body["id"] == printer_row.id
			
 
				+        assert body["name"] == "StatusTest"
			
 
				+        assert body["connected"] is True
			
 
				+        assert body["state"] == "RUNNING"
			
 
				+        assert body["current_print"] == "bench.3mf"
			
 
				+        assert body["progress"] == 42.0
			
 
				+        assert body["remaining_time"] == 1234
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_200_when_status_is_none(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+        printer_row,
			
 
				+    ):
			
 
				+        """A registered printer the manager hasn't seen yet returns None from
			
 
				+        ``get_status``; the response must still be 200 with sensible
			
 
				+        defaults rather than 500."""
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.webhook.printer_manager.get_status",
			
 
				+            MagicMock(return_value=None),
			
 
				+        ):
			
 
				+            resp = await async_client.get(
			
 
				+                f"/api/v1/webhook/printer/{printer_row.id}/status",
			
 
				+                headers={"X-API-Key": api_key_data},
			
 
				+            )
			
 
				+
			
 
				+        assert resp.status_code == 200, resp.text
			
 
				+        body = resp.json()
			
 
				+        assert body["id"] == printer_row.id
			
 
				+        assert body["connected"] is False
			
 
				+        assert body["state"] is None
			
 
				+        assert body["current_print"] is None
			
 
				+        assert body["progress"] is None
			
 
				+        assert body["remaining_time"] is None
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_404_when_printer_does_not_exist(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+    ):
			
 
				+        resp = await async_client.get(
			
 
				+            "/api/v1/webhook/printer/99999/status",
			
 
				+            headers={"X-API-Key": api_key_data},
			
 
				+        )
			
 
				+        assert resp.status_code == 404
			
 
				+
			
 
				+
			
 
				+class TestWebhookStopPrint:
			
 
				+    """``POST /api/v1/webhook/printer/{id}/stop`` — same dataclass-shape
			
 
				+    fix applies to the connection / state precondition checks (#1584)."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_503_when_disconnected(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+        printer_row,
			
 
				+    ):
			
 
				+        state = PrinterState(connected=False, state="unknown")
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.webhook.printer_manager.get_status",
			
 
				+            MagicMock(return_value=state),
			
 
				+        ):
			
 
				+            resp = await async_client.post(
			
 
				+                f"/api/v1/webhook/printer/{printer_row.id}/stop",
			
 
				+                headers={"X-API-Key": api_key_data},
			
 
				+            )
			
 
				+        # Pre-fix this would have 500'd on `status.get(...)`. Now it
			
 
				+        # cleanly returns the documented 503.
			
 
				+        assert resp.status_code == 503
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_409_when_not_running(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+        printer_row,
			
 
				+    ):
			
 
				+        state = PrinterState(connected=True, state="FINISH")
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.webhook.printer_manager.get_status",
			
 
				+            MagicMock(return_value=state),
			
 
				+        ):
			
 
				+            resp = await async_client.post(
			
 
				+                f"/api/v1/webhook/printer/{printer_row.id}/stop",
			
 
				+                headers={"X-API-Key": api_key_data},
			
 
				+            )
			
 
				+        assert resp.status_code == 409
			
 
				+
			
 
				+
			
 
				+class TestWebhookCancelPrint:
			
 
				+    """``POST /api/v1/webhook/printer/{id}/cancel`` — same fix shape."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_503_when_disconnected(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+        printer_row,
			
 
				+    ):
			
 
				+        state = PrinterState(connected=False, state="unknown")
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.webhook.printer_manager.get_status",
			
 
				+            MagicMock(return_value=state),
			
 
				+        ):
			
 
				+            resp = await async_client.post(
			
 
				+                f"/api/v1/webhook/printer/{printer_row.id}/cancel",
			
 
				+                headers={"X-API-Key": api_key_data},
			
 
				+            )
			
 
				+        assert resp.status_code == 503
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    @pytest.mark.integration
			
 
				+    async def test_returns_409_when_not_running_or_paused(
			
 
				+        self,
			
 
				+        async_client: AsyncClient,
			
 
				+        api_key_data,
			
 
				+        printer_row,
			
 
				+    ):
			
 
				+        state = PrinterState(connected=True, state="IDLE")
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.webhook.printer_manager.get_status",
			
 
				+            MagicMock(return_value=state),
			
 
				+        ):
			
 
				+            resp = await async_client.post(
			
 
				+                f"/api/v1/webhook/printer/{printer_row.id}/cancel",
			
 
				+                headers={"X-API-Key": api_key_data},
			
 
				+            )
			
 
				+        assert resp.status_code == 409
			
--- a/backend/tests/unit/services/test_archive_service.py
+++ b/backend/tests/unit/services/test_archive_service.py
@@ -729,3 +729,149 @@ class TestGcodeHeaderFilamentUsage:
 
				         meta = ThreeMFParser(self._make_3mf("; total layer number: 10\n")).parse()
			
 
				         assert "filament_used_grams" not in meta
			
 
				         assert "filament_used_mm" not in meta
			
 
				+
			
 
				+
			
 
				+class TestMultiPlateSliceInfoSum:
			
 
				+    """Multi-plate ``.gcode.3mf`` exports must produce file-level totals that
			
 
				+    are the SUM of every plate's prediction + weight, not plate-1 only.
			
 
				+
			
 
				+    Pre-fix the parser used ``root.find(".//plate")`` and only read the
			
 
				+    first plate's metadata, so the archive card and project rollup
			
 
				+    under-reported by roughly the number of plates (#1593).
			
 
				+    """
			
 
				+
			
 
				+    @staticmethod
			
 
				+    def _make_3mf_with_slice_info(slice_info_xml: str) -> str:
			
 
				+        """Write a minimal .3mf with the given slice_info.config payload.
			
 
				+
			
 
				+        Bambu Studio's slice_info.config is the file the parser reads for
			
 
				+        file-level `prediction` / `weight`; the rest of the 3MF members
			
 
				+        aren't required for this test.
			
 
				+        """
			
 
				+        import os
			
 
				+        import tempfile
			
 
				+        import zipfile
			
 
				+
			
 
				+        fd, path = tempfile.mkstemp(suffix=".3mf")
			
 
				+        os.close(fd)
			
 
				+        with zipfile.ZipFile(path, "w", zipfile.ZIP_DEFLATED) as zf:
			
 
				+            zf.writestr("3D/3dmodel.model", "<model/>")
			
 
				+            zf.writestr("Metadata/slice_info.config", slice_info_xml)
			
 
				+        return path
			
 
				+
			
 
				+    def test_three_plate_file_sums_prediction_and_weight(self):
			
 
				+        """The reporter's case: three plates with distinct prediction +
			
 
				+        weight values must yield file-level totals that are the sum.
			
 
				+        """
			
 
				+        from backend.app.services.archive import ThreeMFParser
			
 
				+
			
 
				+        slice_info_xml = """<?xml version="1.0" encoding="UTF-8"?>
			
 
				+        <config>
			
 
				+            <plate>
			
 
				+                <metadata key="index" value="1" />
			
 
				+                <metadata key="prediction" value="7140" />
			
 
				+                <metadata key="weight" value="19.2" />
			
 
				+            </plate>
			
 
				+            <plate>
			
 
				+                <metadata key="index" value="2" />
			
 
				+                <metadata key="prediction" value="6000" />
			
 
				+                <metadata key="weight" value="20.0" />
			
 
				+            </plate>
			
 
				+            <plate>
			
 
				+                <metadata key="index" value="3" />
			
 
				+                <metadata key="prediction" value="6300" />
			
 
				+                <metadata key="weight" value="18.8" />
			
 
				+            </plate>
			
 
				+        </config>
			
 
				+        """
			
 
				+        parser = ThreeMFParser(self._make_3mf_with_slice_info(slice_info_xml))
			
 
				+        meta = parser.parse()
			
 
				+        assert meta["print_time_seconds"] == 7140 + 6000 + 6300  # 19440
			
 
				+        assert meta["filament_used_grams"] == round(19.2 + 20.0 + 18.8, 2)  # 58.0
			
 
				+        # Multi-plate file: no single plate index should be claimed at the
			
 
				+        # file level — the archive represents all plates, not a specific one.
			
 
				+        assert parser.plate_number is None
			
 
				+
			
 
				+    def test_single_plate_file_preserves_plate_index_and_objects(self):
			
 
				+        """The single-plate path must still set ``_plate_index`` and pick
			
 
				+        up printable objects — these only make sense when the archive
			
 
				+        represents exactly one plate.
			
 
				+        """
			
 
				+        from backend.app.services.archive import ThreeMFParser
			
 
				+
			
 
				+        slice_info_xml = """<?xml version="1.0" encoding="UTF-8"?>
			
 
				+        <config>
			
 
				+            <plate>
			
 
				+                <metadata key="index" value="2" />
			
 
				+                <metadata key="prediction" value="3600" />
			
 
				+                <metadata key="weight" value="50.5" />
			
 
				+                <metadata key="curr_bed_type" value="textured_pei" />
			
 
				+                <object identify_id="1" name="Part_A" skipped="false" />
			
 
				+                <object identify_id="2" name="Part_B" skipped="true" />
			
 
				+            </plate>
			
 
				+        </config>
			
 
				+        """
			
 
				+        parser = ThreeMFParser(self._make_3mf_with_slice_info(slice_info_xml))
			
 
				+        meta = parser.parse()
			
 
				+        assert meta["print_time_seconds"] == 3600
			
 
				+        assert meta["filament_used_grams"] == 50.5
			
 
				+        # Single-plate exports surface the plate index via ``plate_number``
			
 
				+        # (``_plate_index`` is an internal key cleared at the end of parse).
			
 
				+        assert parser.plate_number == 2
			
 
				+        assert meta["bed_type"] == "textured_pei"
			
 
				+        assert meta["printable_objects"] == {1: "Part_A"}
			
 
				+
			
 
				+    def test_multi_plate_ignores_per_plate_objects(self):
			
 
				+        """Multi-plate exports must NOT carry a single plate's objects at
			
 
				+        the file level — the ``/plates`` endpoint surfaces them per-plate.
			
 
				+        Conflating them would attach plate-1's parts to the whole archive.
			
 
				+        """
			
 
				+        from backend.app.services.archive import ThreeMFParser
			
 
				+
			
 
				+        slice_info_xml = """<?xml version="1.0" encoding="UTF-8"?>
			
 
				+        <config>
			
 
				+            <plate>
			
 
				+                <metadata key="index" value="1" />
			
 
				+                <metadata key="prediction" value="1000" />
			
 
				+                <metadata key="weight" value="10.0" />
			
 
				+                <object identify_id="1" name="Part_A" skipped="false" />
			
 
				+            </plate>
			
 
				+            <plate>
			
 
				+                <metadata key="index" value="2" />
			
 
				+                <metadata key="prediction" value="1500" />
			
 
				+                <metadata key="weight" value="15.0" />
			
 
				+                <object identify_id="2" name="Part_B" skipped="false" />
			
 
				+            </plate>
			
 
				+        </config>
			
 
				+        """
			
 
				+        parser = ThreeMFParser(self._make_3mf_with_slice_info(slice_info_xml))
			
 
				+        meta = parser.parse()
			
 
				+        assert meta["print_time_seconds"] == 2500
			
 
				+        assert meta["filament_used_grams"] == 25.0
			
 
				+        # No archive-level object list when there's more than one plate.
			
 
				+        assert "printable_objects" not in meta
			
 
				+        assert parser.plate_number is None
			
 
				+
			
 
				+    def test_missing_or_malformed_values_are_skipped(self):
			
 
				+        """A plate with a malformed prediction/weight string must skip
			
 
				+        that field, not poison the sum or raise — defensive parsing was
			
 
				+        already present per-field; the sum loop must preserve it.
			
 
				+        """
			
 
				+        from backend.app.services.archive import ThreeMFParser
			
 
				+
			
 
				+        slice_info_xml = """<?xml version="1.0" encoding="UTF-8"?>
			
 
				+        <config>
			
 
				+            <plate>
			
 
				+                <metadata key="prediction" value="100" />
			
 
				+                <metadata key="weight" value="not-a-number" />
			
 
				+            </plate>
			
 
				+            <plate>
			
 
				+                <metadata key="prediction" value="200" />
			
 
				+                <metadata key="weight" value="5.0" />
			
 
				+            </plate>
			
 
				+        </config>
			
 
				+        """
			
 
				+        meta = ThreeMFParser(self._make_3mf_with_slice_info(slice_info_xml)).parse()
			
 
				+        assert meta["print_time_seconds"] == 300
			
 
				+        # Only the second plate's weight contributed.
			
 
				+        assert meta["filament_used_grams"] == 5.0
			
--- a/backend/tests/unit/services/test_attach_timelapse_safe_path.py
+++ b/backend/tests/unit/services/test_attach_timelapse_safe_path.py
@@ -0,0 +1,116 @@
 
				+"""Regression tests for ArchiveService.attach_timelapse path-traversal guard.
			
 
				+
			
 
				+``filename`` ultimately comes from a printer's FTP listing or a query
			
 
				+parameter on ``POST /archives/{id}/timelapse/select``. A compromised printer
			
 
				+that returns a malicious filename (e.g. ``"../../etc/passwd"``) used to land
			
 
				+the write outside the archive directory. The safe-join helper now rejects
			
 
				+such names; this test locks the behaviour in.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+from pathlib import Path
			
 
				+from unittest.mock import AsyncMock, MagicMock
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.services.archive import ArchiveService
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_attach_timelapse_rejects_dotdot_filename(tmp_path: Path, monkeypatch):
			
 
				+    """A ``..`` traversal in filename must not land bytes outside archive_dir."""
			
 
				+    # Stage an archive directory that the service thinks is owned.
			
 
				+    archive_dir = tmp_path / "archive" / "1" / "20260101_test"
			
 
				+    archive_dir.mkdir(parents=True)
			
 
				+    # Repoint settings.base_dir so attach_timelapse's archive_dir = file_path.parent
			
 
				+    # resolves to our tmp directory.
			
 
				+    monkeypatch.setattr(
			
 
				+        "backend.app.services.archive.settings",
			
 
				+        MagicMock(base_dir=tmp_path),
			
 
				+    )
			
 
				+
			
 
				+    db = MagicMock()
			
 
				+    db.commit = AsyncMock()
			
 
				+    service = ArchiveService(db)
			
 
				+
			
 
				+    # Mock the archive lookup to return a row whose file_path resolves under tmp_path.
			
 
				+    fake_archive = MagicMock()
			
 
				+    fake_archive.file_path = "archive/1/20260101_test/file.3mf"
			
 
				+    service.get_archive = AsyncMock(return_value=fake_archive)
			
 
				+
			
 
				+    # The attacker-controlled filename in the threat model.
			
 
				+    malicious = "../../etc/passwd_pwned"
			
 
				+
			
 
				+    result = await service.attach_timelapse(
			
 
				+        archive_id=1,
			
 
				+        timelapse_data=b"would-be-attacker-payload",
			
 
				+        filename=malicious,
			
 
				+    )
			
 
				+
			
 
				+    # The helper rejected the join → service returns False.
			
 
				+    assert result is False
			
 
				+    # And no payload landed at the target outside archive_dir.
			
 
				+    target_outside = tmp_path / "etc" / "passwd_pwned"
			
 
				+    assert not target_outside.exists(), "Attacker payload landed outside archive_dir"
			
 
				+    # And no payload landed under archive_dir either (since we rejected before write).
			
 
				+    assert not list(archive_dir.glob("*"))
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_attach_timelapse_rejects_absolute_filename(tmp_path: Path, monkeypatch):
			
 
				+    """An absolute path in filename must not collapse the join."""
			
 
				+    archive_dir = tmp_path / "archive" / "1" / "20260101_test"
			
 
				+    archive_dir.mkdir(parents=True)
			
 
				+    monkeypatch.setattr(
			
 
				+        "backend.app.services.archive.settings",
			
 
				+        MagicMock(base_dir=tmp_path),
			
 
				+    )
			
 
				+
			
 
				+    db = MagicMock()
			
 
				+    db.commit = AsyncMock()
			
 
				+    service = ArchiveService(db)
			
 
				+
			
 
				+    fake_archive = MagicMock()
			
 
				+    fake_archive.file_path = "archive/1/20260101_test/file.3mf"
			
 
				+    service.get_archive = AsyncMock(return_value=fake_archive)
			
 
				+
			
 
				+    result = await service.attach_timelapse(
			
 
				+        archive_id=1,
			
 
				+        timelapse_data=b"x",
			
 
				+        filename="/tmp/owned_via_absolute",  # nosec B108
			
 
				+    )
			
 
				+
			
 
				+    assert result is False
			
 
				+    assert not Path("/tmp/owned_via_absolute").exists()  # nosec B108
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_attach_timelapse_accepts_legit_filename(tmp_path: Path, monkeypatch):
			
 
				+    """The legitimate happy path must still work — the fix isn't over-strict."""
			
 
				+    archive_dir = tmp_path / "archive" / "1" / "20260101_test"
			
 
				+    archive_dir.mkdir(parents=True)
			
 
				+    monkeypatch.setattr(
			
 
				+        "backend.app.services.archive.settings",
			
 
				+        MagicMock(base_dir=tmp_path),
			
 
				+    )
			
 
				+
			
 
				+    db = MagicMock()
			
 
				+    db.commit = AsyncMock()
			
 
				+    service = ArchiveService(db)
			
 
				+
			
 
				+    fake_archive = MagicMock()
			
 
				+    fake_archive.file_path = "archive/1/20260101_test/file.3mf"
			
 
				+    fake_archive.timelapse_path = None
			
 
				+    service.get_archive = AsyncMock(return_value=fake_archive)
			
 
				+
			
 
				+    result = await service.attach_timelapse(
			
 
				+        archive_id=1,
			
 
				+        timelapse_data=b"hello-timelapse",
			
 
				+        filename="timelapse_2026-01-01_12-00-00.mp4",
			
 
				+    )
			
 
				+
			
 
				+    assert result is True
			
 
				+    landed = archive_dir / "timelapse_2026-01-01_12-00-00.mp4"
			
 
				+    assert landed.exists()
			
 
				+    assert landed.read_bytes() == b"hello-timelapse"
			
--- a/backend/tests/unit/services/test_bambu_cloud.py
+++ b/backend/tests/unit/services/test_bambu_cloud.py
@@ -202,10 +202,13 @@ class TestBambuCloudTOTPVerification:
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     async def test_verify_totp_cloudflare_blocked(self, cloud_service):
			
 
				-        """When Cloudflare blocks request, should handle gracefully."""
			
 
				+        """When Cloudflare returns a 'Just a moment...' interstitial instead of
			
 
				+        JSON, surface the actionable CF-specific message (issue #1575) rather
			
 
				+        than the opaque "Invalid response from Bambu Cloud" parse error."""
			
 
				         mock_response = MagicMock()
			
 
				         mock_response.status_code = 403
			
 
				         mock_response.text = "<!DOCTYPE html><html><head><title>Just a moment...</title>"
			
 
				+        mock_response.headers = {}
			
 
				         # json() raises an error when response is HTML
			
 
				         mock_response.json.side_effect = ValueError("No JSON")
			
 
				 
			
@@ -215,7 +218,8 @@ class TestBambuCloudTOTPVerification:
 
				             result = await cloud_service.verify_totp("test-tfa-key", "123456")
			
 
				 
			
 
				             assert result["success"] is False
			
 
				-            assert "Invalid response" in result["message"]
			
 
				+            assert "Cloudflare" in result["message"]
			
 
				+            assert "bambulab.com" in result["message"]
			
 
				 
			
 
				     @pytest.mark.asyncio
			
 
				     async def test_verify_totp_uses_honest_bambuddy_user_agent(self, cloud_service):
			
@@ -305,3 +309,131 @@ class TestBambuCloudRegion:
 
				             url = mock_post.call_args[0][0]
			
 
				             assert "bambulab.cn/api/sign-in/tfa" in url
			
 
				             assert "bambulab.com" not in url
			
 
				+
			
 
				+
			
 
				+# ===========================================================================
			
 
				+# Issue #1575: Cloudflare interstitial → actionable error message
			
 
				+# ===========================================================================
			
 
				+
			
 
				+
			
 
				+class TestCloudflareChallengeDetection:
			
 
				+    """The _detect_cloudflare_challenge helper inspects a response and returns
			
 
				+    the user-actionable message when CF returned a challenge / mitigation page
			
 
				+    instead of JSON. None otherwise."""
			
 
				+
			
 
				+    # The actual interstitial fragment captured from issue #1575's log — keeping
			
 
				+    # this verbatim so future regressions in detection are checked against the
			
 
				+    # exact body shape the user hit, not a stylised copy.
			
 
				+    _REPORTER_INTERSTITIAL = (
			
 
				+        '<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...'
			
 
				+        '</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">'
			
 
				+        '<meta http-equiv="X-UA-Compatible" content="IE=Edge">'
			
 
				+        '<meta name="robots" content="noindex,nofollow">'
			
 
				+        '<meta name="viewport" content="width=device-width,initial-scale=1">'
			
 
				+    )
			
 
				+
			
 
				+    def test_just_a_moment_title_in_body(self):
			
 
				+        from backend.app.services.bambu_cloud import _detect_cloudflare_challenge
			
 
				+
			
 
				+        response = MagicMock()
			
 
				+        response.text = self._REPORTER_INTERSTITIAL
			
 
				+        response.status_code = 200
			
 
				+        response.headers = {}
			
 
				+        assert _detect_cloudflare_challenge(response) is not None
			
 
				+
			
 
				+    def test_challenges_cloudflare_com_in_body(self):
			
 
				+        from backend.app.services.bambu_cloud import _detect_cloudflare_challenge
			
 
				+
			
 
				+        response = MagicMock()
			
 
				+        response.text = (
			
 
				+            '<html><body><script src="https://challenges.cloudflare.com/turnstile/v0/api.js"></script></body></html>'
			
 
				+        )
			
 
				+        response.status_code = 200
			
 
				+        response.headers = {}
			
 
				+        assert _detect_cloudflare_challenge(response) is not None
			
 
				+
			
 
				+    def test_cf_mitigated_403(self):
			
 
				+        from backend.app.services.bambu_cloud import _detect_cloudflare_challenge
			
 
				+
			
 
				+        response = MagicMock()
			
 
				+        response.text = ""
			
 
				+        response.status_code = 403
			
 
				+        response.headers = {"cf-mitigated": "challenge"}
			
 
				+        assert _detect_cloudflare_challenge(response) is not None
			
 
				+
			
 
				+    def test_cf_ray_503(self):
			
 
				+        from backend.app.services.bambu_cloud import _detect_cloudflare_challenge
			
 
				+
			
 
				+        response = MagicMock()
			
 
				+        response.text = "<html>Under attack</html>"
			
 
				+        response.status_code = 503
			
 
				+        response.headers = {"cf-ray": "abc-DEF"}
			
 
				+        assert _detect_cloudflare_challenge(response) is not None
			
 
				+
			
 
				+    def test_real_json_400_is_not_a_challenge(self):
			
 
				+        """Application-level 400 with the real "Login failed" JSON the API
			
 
				+        normally returns must NOT be misclassified as a CF challenge — that
			
 
				+        would suppress the actionable upstream error."""
			
 
				+        from backend.app.services.bambu_cloud import _detect_cloudflare_challenge
			
 
				+
			
 
				+        response = MagicMock()
			
 
				+        response.text = '{"code":5,"error":"Login failed"}'
			
 
				+        response.status_code = 400
			
 
				+        response.headers = {"cf-ray": "abc-DEF", "server": "cloudflare"}
			
 
				+        assert _detect_cloudflare_challenge(response) is None
			
 
				+
			
 
				+    def test_message_mentions_bambu_lab_and_cloudflare(self):
			
 
				+        """The message must clearly attribute the block to Bambu Lab's
			
 
				+        Cloudflare protection — not to Bambuddy — so users know what to do."""
			
 
				+        from backend.app.services.bambu_cloud import _detect_cloudflare_challenge
			
 
				+
			
 
				+        response = MagicMock()
			
 
				+        response.text = "<title>Just a moment...</title>"
			
 
				+        response.status_code = 200
			
 
				+        response.headers = {}
			
 
				+        msg = _detect_cloudflare_challenge(response)
			
 
				+        assert msg is not None
			
 
				+        assert "Cloudflare" in msg
			
 
				+        assert "bambulab.com" in msg
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_verify_code_surfaces_cf_message_on_interstitial(self):
			
 
				+        """verify_code (email-code path) must surface the CF message when the
			
 
				+        endpoint returns an HTML interstitial — same shape as verify_totp."""
			
 
				+        cloud = BambuCloudService()
			
 
				+
			
 
				+        mock_response = MagicMock()
			
 
				+        mock_response.status_code = 403
			
 
				+        mock_response.text = self._REPORTER_INTERSTITIAL
			
 
				+        mock_response.headers = {}
			
 
				+        mock_response.json.side_effect = ValueError("No JSON")
			
 
				+
			
 
				+        with patch.object(cloud._client, "post", new_callable=AsyncMock) as mock_post:
			
 
				+            mock_post.return_value = mock_response
			
 
				+
			
 
				+            result = await cloud.verify_code("test@example.com", "123456")
			
 
				+
			
 
				+            assert result["success"] is False
			
 
				+            assert "Cloudflare" in result["message"]
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_login_request_surfaces_cf_message_on_interstitial(self):
			
 
				+        """login_request must surface the CF message when the endpoint returns
			
 
				+        an HTML interstitial. Previously the parse error bubbled to
			
 
				+        BambuCloudAuthError with an opaque "Expecting value..." detail."""
			
 
				+        cloud = BambuCloudService()
			
 
				+
			
 
				+        mock_response = MagicMock()
			
 
				+        mock_response.status_code = 403
			
 
				+        mock_response.text = self._REPORTER_INTERSTITIAL
			
 
				+        mock_response.headers = {}
			
 
				+        mock_response.json.side_effect = ValueError("No JSON")
			
 
				+
			
 
				+        with patch.object(cloud._client, "post", new_callable=AsyncMock) as mock_post:
			
 
				+            mock_post.return_value = mock_response
			
 
				+
			
 
				+            result = await cloud.login_request("test@example.com", "password")
			
 
				+
			
 
				+            assert result["success"] is False
			
 
				+            assert result["needs_verification"] is False
			
 
				+            assert "Cloudflare" in result["message"]
			
--- a/backend/tests/unit/services/test_notification_service.py
+++ b/backend/tests/unit/services/test_notification_service.py
@@ -2057,3 +2057,149 @@ class TestFirstLayerCompleteNotifications:
 
				             mock_send.assert_called_once()
			
 
				             call_kwargs = mock_send.call_args
			
 
				             assert call_kwargs.kwargs.get("image_data") == fake_image
			
 
				+
			
 
				+
			
 
				+class TestNtfyOutbound:
			
 
				+    """Regression for #1534 — UA hygiene and Cloudflare-challenge detection."""
			
 
				+
			
 
				+    @pytest.fixture
			
 
				+    def service(self):
			
 
				+        return NotificationService()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_notification_client_sets_honest_user_agent(self, service):
			
 
				+        """Default httpx UA leaks `python-httpx/<version>` — every other
			
 
				+        outbound client in the codebase identifies as Bambuddy. The
			
 
				+        notification client must too."""
			
 
				+        client = await service._get_client()
			
 
				+        try:
			
 
				+            assert client.headers.get("user-agent") == "Bambuddy/1.0 (+https://github.com/maziggy/bambuddy)"
			
 
				+        finally:
			
 
				+            await service.close()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_ntfy_cloudflare_challenge_returns_actionable_error(self, service):
			
 
				+        """When ntfy is fronted by Cloudflare and CF returns its JS
			
 
				+        challenge, the user must see a message that points at the actual
			
 
				+        fix (CF security skip), not the raw HTML."""
			
 
				+        import httpx
			
 
				+
			
 
				+        challenge_html = (
			
 
				+            '<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title>'
			
 
				+            '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">'
			
 
				+        )
			
 
				+        mock_response = httpx.Response(
			
 
				+            403,
			
 
				+            content=challenge_html.encode(),
			
 
				+            headers={"server": "cloudflare", "content-type": "text/html; charset=UTF-8"},
			
 
				+        )
			
 
				+
			
 
				+        mock_client = AsyncMock()
			
 
				+        mock_client.post = AsyncMock(return_value=mock_response)
			
 
				+
			
 
				+        with patch.object(service, "_get_client", AsyncMock(return_value=mock_client)):
			
 
				+            ok, detail = await service._send_ntfy(
			
 
				+                {"server": "https://ntfy.example", "topic": "alerts", "auth_token": "tk_xxx"},
			
 
				+                title="t",
			
 
				+                message="m",
			
 
				+            )
			
 
				+
			
 
				+        assert ok is False
			
 
				+        assert "Cloudflare" in detail
			
 
				+        assert "security-skip" in detail or "Bot Fight Mode" in detail
			
 
				+        # The raw HTML must not be the dominant content shown to the user.
			
 
				+        assert "<!DOCTYPE" not in detail
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_ntfy_normal_403_still_surfaces_body(self, service):
			
 
				+        """A non-Cloudflare 403 (e.g. ntfy auth fail) must keep showing
			
 
				+        the original body so the user can debug the real error — we
			
 
				+        only intercept the Cloudflare-challenge shape."""
			
 
				+        import httpx
			
 
				+
			
 
				+        mock_response = httpx.Response(
			
 
				+            403,
			
 
				+            content=b"forbidden: invalid auth token",
			
 
				+            headers={"content-type": "text/plain"},
			
 
				+        )
			
 
				+
			
 
				+        mock_client = AsyncMock()
			
 
				+        mock_client.post = AsyncMock(return_value=mock_response)
			
 
				+
			
 
				+        with patch.object(service, "_get_client", AsyncMock(return_value=mock_client)):
			
 
				+            ok, detail = await service._send_ntfy(
			
 
				+                {"server": "https://ntfy.sh", "topic": "alerts", "auth_token": "bad"},
			
 
				+                title="t",
			
 
				+                message="m",
			
 
				+            )
			
 
				+
			
 
				+        assert ok is False
			
 
				+        assert "Cloudflare" not in detail
			
 
				+        assert "invalid auth token" in detail
			
 
				+        assert detail.startswith("HTTP 403:")
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_ntfy_origin_error_through_cloudflare_is_not_misclassified(self, service):
			
 
				+        """Cloudflare adds Server: cloudflare to EVERY proxied response,
			
 
				+        including legitimate origin errors. A real 401 "wrong token"
			
 
				+        from an ntfy server that happens to sit behind Cloudflare must
			
 
				+        still surface the origin's actual error body — we must not flip
			
 
				+        every CF-fronted 4xx into a "your Cloudflare is blocking" message.
			
 
				+        """
			
 
				+        import httpx
			
 
				+
			
 
				+        mock_response = httpx.Response(
			
 
				+            401,
			
 
				+            content=b'{"code":40101,"http":401,"error":"unauthorized"}',
			
 
				+            headers={
			
 
				+                "server": "cloudflare",
			
 
				+                "cf-ray": "abc123-FRA",
			
 
				+                "content-type": "application/json",
			
 
				+                # No cf-mitigated — CF just proxied the origin response.
			
 
				+            },
			
 
				+        )
			
 
				+
			
 
				+        mock_client = AsyncMock()
			
 
				+        mock_client.post = AsyncMock(return_value=mock_response)
			
 
				+
			
 
				+        with patch.object(service, "_get_client", AsyncMock(return_value=mock_client)):
			
 
				+            ok, detail = await service._send_ntfy(
			
 
				+                {"server": "https://ntfy.example", "topic": "alerts", "auth_token": "wrong"},
			
 
				+                title="t",
			
 
				+                message="m",
			
 
				+            )
			
 
				+
			
 
				+        assert ok is False
			
 
				+        assert "Cloudflare" not in detail
			
 
				+        assert "unauthorized" in detail
			
 
				+        assert detail.startswith("HTTP 401:")
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_ntfy_cloudflare_cf_mitigated_header_alone_triggers(self, service):
			
 
				+        """The cf-mitigated header on its own is enough — that's the
			
 
				+        canonical CF "I actively blocked this" signal, even if the
			
 
				+        response body shape changes between CF challenge generations."""
			
 
				+        import httpx
			
 
				+
			
 
				+        mock_response = httpx.Response(
			
 
				+            403,
			
 
				+            content=b"<html>some future CF block page</html>",
			
 
				+            headers={
			
 
				+                "server": "cloudflare",
			
 
				+                "cf-mitigated": "challenge",
			
 
				+                "content-type": "text/html",
			
 
				+            },
			
 
				+        )
			
 
				+
			
 
				+        mock_client = AsyncMock()
			
 
				+        mock_client.post = AsyncMock(return_value=mock_response)
			
 
				+
			
 
				+        with patch.object(service, "_get_client", AsyncMock(return_value=mock_client)):
			
 
				+            ok, detail = await service._send_ntfy(
			
 
				+                {"server": "https://ntfy.example", "topic": "alerts"},
			
 
				+                title="t",
			
 
				+                message="m",
			
 
				+            )
			
 
				+
			
 
				+        assert ok is False
			
 
				+        assert "Cloudflare" in detail
			
--- a/backend/tests/unit/services/test_stl_thumbnail.py
+++ b/backend/tests/unit/services/test_stl_thumbnail.py
@@ -1,5 +1,6 @@
 
				 """Unit tests for the STL thumbnail service."""
			
 
				 
			
 
				+import os
			
 
				 import tempfile
			
 
				 from pathlib import Path
			
 
				 
			
@@ -230,3 +231,97 @@ class TestStlThumbnailConstants:
 
				         from backend.app.services.stl_thumbnail import MAX_VERTICES
			
 
				 
			
 
				         assert MAX_VERTICES == 100000
			
 
				+
			
 
				+    def test_min_usable_stl_bytes_threshold(self):
			
 
				+        """MIN_USABLE_STL_BYTES is the call-site pre-skip floor.
			
 
				+
			
 
				+        Binary STL with one triangle = 80B header + 4B count + 50B triangle
			
 
				+        = 134B. ASCII STL with one triangle ≈ 150B. Anything below this size
			
 
				+        cannot contain a usable mesh.
			
 
				+        """
			
 
				+        from backend.app.services.stl_thumbnail import MIN_USABLE_STL_BYTES
			
 
				+
			
 
				+        assert MIN_USABLE_STL_BYTES == 200
			
 
				+        # Verify it sits between "smaller than smallest real STL" and
			
 
				+        # "common stub size" — the 24-byte ``solid test\nendsolid test``
			
 
				+        # stubs that triggered the warning storm.
			
 
				+        assert MIN_USABLE_STL_BYTES > 134  # smallest binary STL with one triangle
			
 
				+        assert MIN_USABLE_STL_BYTES > 150  # smallest ASCII STL with one triangle
			
 
				+        assert MIN_USABLE_STL_BYTES > 24  # the ZIP-stub case in the bug report
			
 
				+
			
 
				+    def test_font_manager_logger_demoted_to_warning(self):
			
 
				+        """matplotlib.font_manager's per-font INFO scan is demoted at module
			
 
				+        import so the first STL upload doesn't surface a multi-line preamble
			
 
				+        of matplotlib internals in the journal."""
			
 
				+        import logging
			
 
				+
			
 
				+        # Importing the module sets the level as a side effect.
			
 
				+        import backend.app.services.stl_thumbnail  # noqa: F401
			
 
				+
			
 
				+        assert logging.getLogger("matplotlib.font_manager").level >= logging.WARNING
			
 
				+
			
 
				+    def test_configure_matplotlib_cache_sets_mplconfigdir(self, tmp_path, monkeypatch):
			
 
				+        """``_configure_matplotlib_cache`` points matplotlib at a writable
			
 
				+        persistent path so it doesn't fall back to ``/tmp/matplotlib-XXX``
			
 
				+        on every cold start."""
			
 
				+        from backend.app.services.stl_thumbnail import _configure_matplotlib_cache
			
 
				+
			
 
				+        # Ensure we start with no value so the helper actually runs.
			
 
				+        monkeypatch.delenv("MPLCONFIGDIR", raising=False)
			
 
				+        monkeypatch.setattr(
			
 
				+            "backend.app.services.stl_thumbnail.Path",
			
 
				+            __import__("pathlib").Path,
			
 
				+        )
			
 
				+
			
 
				+        # Stub settings.base_dir to point inside tmp_path.
			
 
				+        from backend.app.core import config as core_config
			
 
				+
			
 
				+        monkeypatch.setattr(core_config.settings, "base_dir", tmp_path, raising=False)
			
 
				+
			
 
				+        _configure_matplotlib_cache()
			
 
				+
			
 
				+        assert "MPLCONFIGDIR" in os.environ
			
 
				+        configured = Path(os.environ["MPLCONFIGDIR"])
			
 
				+        assert configured.exists()
			
 
				+        assert configured.is_dir()
			
 
				+        # And the directory sits under base_dir, not /tmp/matplotlib-XXX.
			
 
				+        assert tmp_path in configured.parents
			
 
				+
			
 
				+    def test_configure_matplotlib_cache_respects_externally_set_value(self, tmp_path, monkeypatch):
			
 
				+        """If the operator (or container init) has set MPLCONFIGDIR already,
			
 
				+        the helper must leave it alone — they made a deliberate choice."""
			
 
				+        from backend.app.services.stl_thumbnail import _configure_matplotlib_cache
			
 
				+
			
 
				+        external = str(tmp_path / "external-mpl-cache")
			
 
				+        monkeypatch.setenv("MPLCONFIGDIR", external)
			
 
				+        _configure_matplotlib_cache()
			
 
				+        assert os.environ["MPLCONFIGDIR"] == external
			
 
				+
			
 
				+    def test_empty_mesh_logged_at_debug_not_warning(self, caplog):
			
 
				+        """An empty STL (header present, no triangles) must log at DEBUG, not
			
 
				+        WARNING — bulk uploads used to log thousands of WARNING lines per
			
 
				+        ZIP. Per-file content observations stay observable in debug logs
			
 
				+        but don't spam production journals."""
			
 
				+        import logging
			
 
				+        import tempfile
			
 
				+        from pathlib import Path
			
 
				+
			
 
				+        from backend.app.services.stl_thumbnail import generate_stl_thumbnail
			
 
				+
			
 
				+        # The exact 24-byte stub from the bug report
			
 
				+        stub_content = b"solid test\nendsolid test"
			
 
				+
			
 
				+        with tempfile.TemporaryDirectory() as tmpdir:
			
 
				+            tmpdir_path = Path(tmpdir)
			
 
				+            stl_path = tmpdir_path / "stub.stl"
			
 
				+            stl_path.write_bytes(stub_content)
			
 
				+
			
 
				+            with caplog.at_level(logging.DEBUG, logger="backend.app.services.stl_thumbnail"):
			
 
				+                result = generate_stl_thumbnail(stl_path, tmpdir_path)
			
 
				+
			
 
				+        assert result is None
			
 
				+        # The empty-mesh message must NOT appear at WARNING level.
			
 
				+        warning_records = [r for r in caplog.records if r.levelno >= logging.WARNING and "empty mesh" in r.getMessage()]
			
 
				+        assert warning_records == [], (
			
 
				+            f"Empty-mesh path still logs at WARNING: {[r.getMessage() for r in warning_records]}"
			
 
				+        )
			
--- a/backend/tests/unit/services/test_virtual_printer.py
+++ b/backend/tests/unit/services/test_virtual_printer.py
@@ -47,7 +47,7 @@ class TestVirtualPrinterInstance:
 
				         return VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestPrinter",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -62,7 +62,7 @@ class TestVirtualPrinterInstance:
 
				         """Verify constructor stores parameters correctly."""
			
 
				         assert instance.id == 1
			
 
				         assert instance.name == "TestPrinter"
			
 
				-        assert instance.mode == "immediate"
			
 
				+        assert instance.mode == "archive"
			
 
				         assert instance.model == "C11"
			
 
				         assert instance.access_code == "12345678"
			
 
				         assert instance.serial_suffix == "391800001"
			
@@ -79,7 +79,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=2,
			
 
				             name="X1C",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="BL-P001",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800002",
			
@@ -182,7 +182,7 @@ class TestVirtualPrinterInstance:
 
				         Send-flow slicers don't watch the post-upload state, so this is a
			
 
				         no-op behavior change for them.
			
 
				         """
			
 
				-        instance.mode = "immediate"
			
 
				+        instance.mode = "archive"
			
 
				         instance._mqtt = MagicMock()
			
 
				         instance._mqtt.set_gcode_state = MagicMock()
			
 
				         file_path = Path("/tmp/test.3mf")  # nosec B108
			
@@ -196,7 +196,7 @@ class TestVirtualPrinterInstance:
 
				     async def test_on_file_received_non_3mf_does_not_touch_state(self, instance):
			
 
				         """Non-3MF uploads (e.g., a job's auxiliary files) must not transition
			
 
				         the visible state — the slicer is only tracking the .3mf upload."""
			
 
				-        instance.mode = "immediate"
			
 
				+        instance.mode = "archive"
			
 
				         instance._mqtt = MagicMock()
			
 
				         instance._mqtt.set_gcode_state = MagicMock()
			
 
				         file_path = Path("/tmp/test.gcode")  # nosec B108
			
@@ -236,7 +236,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=30,
			
 
				             name="ImmediateBroadcast",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800030",
			
@@ -289,7 +289,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=10,
			
 
				             name="DefaultDispatch",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800010",
			
@@ -320,7 +320,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=11,
			
 
				             name="AutoDispatchOn",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800011",
			
@@ -374,7 +374,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=31,
			
 
				             name="QueueBroadcast",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800031",
			
@@ -440,7 +440,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=12,
			
 
				             name="AutoDispatchOff",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800012",
			
@@ -499,7 +499,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=22,
			
 
				             name="DefaultsTest",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800022",
			
@@ -572,7 +572,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=23,
			
 
				             name="FreshInstallDefaults",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800023",
			
@@ -636,7 +636,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=24,
			
 
				             name="SlicerInherits",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800024",
			
@@ -723,7 +723,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=25,
			
 
				             name="SlicerIntegers",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800025",
			
@@ -787,7 +787,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=21,
			
 
				             name="Reqs",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800021",
			
@@ -857,7 +857,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=22,
			
 
				             name="ForceColor",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800022",
			
@@ -927,7 +927,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=23,
			
 
				             name="Unparseable",
			
 
				-            mode="print_queue",
			
 
				+            mode="queue",
			
 
				             model="C12",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800023",
			
@@ -996,7 +996,7 @@ class TestVirtualPrinterInstance:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=20,
			
 
				             name="NameSource",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800020",
			
@@ -1030,6 +1030,220 @@ class TestVirtualPrinterInstance:
 
				         kwargs = archive_print_mock.await_args.kwargs
			
 
				         assert kwargs.get("prefer_filename_for_name") is expected_prefer_filename
			
 
				 
			
 
				+    # ========================================================================
			
 
				+    # Tests for failure-path cleanup (#audit-R2-1)
			
 
				+    # ========================================================================
			
 
				+    #
			
 
				+    # All three file handlers (_archive_file, _queue_file, _add_to_print_queue)
			
 
				+    # previously only popped _pending_files and unlinked the temp file on the
			
 
				+    # success branch. Failure paths leaked the marker (blocking same-name
			
 
				+    # retries via the FTP layer) and the temp file on disk. The cleanup must
			
 
				+    # ALWAYS run, even when archival / queue insert raises.
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_archive_file_failure_path_pops_pending_and_unlinks(self, tmp_path):
			
 
				+        """When the archive layer raises, `_pending_files[filename]` must still
			
 
				+        be popped and the temp file must be unlinked. Otherwise the FTP layer's
			
 
				+        same-name retry guard would silently reject the slicer's next attempt
			
 
				+        and the upload_dir would accumulate ghost files."""
			
 
				+        from backend.app.services.virtual_printer.manager import VirtualPrinterInstance
			
 
				+
			
 
				+        mock_db = AsyncMock()
			
 
				+        mock_session_factory = MagicMock()
			
 
				+        mock_session_ctx = AsyncMock()
			
 
				+        mock_session_ctx.__aenter__ = AsyncMock(return_value=mock_db)
			
 
				+        mock_session_ctx.__aexit__ = AsyncMock(return_value=False)
			
 
				+        mock_session_factory.return_value = mock_session_ctx
			
 
				+
			
 
				+        inst = VirtualPrinterInstance(
			
 
				+            vp_id=40,
			
 
				+            name="ArchiveFailCleanup",
			
 
				+            mode="archive",
			
 
				+            model="C12",
			
 
				+            access_code="12345678",
			
 
				+            serial_suffix="391800040",
			
 
				+            base_dir=tmp_path,
			
 
				+            session_factory=mock_session_factory,
			
 
				+        )
			
 
				+        file_path = tmp_path / "cleanup-archive.3mf"
			
 
				+        file_path.write_bytes(b"fake3mf")
			
 
				+        inst._pending_files[file_path.name] = file_path
			
 
				+
			
 
				+        with (
			
 
				+            patch(
			
 
				+                "backend.app.api.routes.settings.get_setting",
			
 
				+                new_callable=AsyncMock,
			
 
				+                return_value=None,
			
 
				+            ),
			
 
				+            patch(
			
 
				+                "backend.app.services.archive.ArchiveService.archive_print",
			
 
				+                new_callable=AsyncMock,
			
 
				+                side_effect=RuntimeError("archive blew up"),
			
 
				+            ),
			
 
				+        ):
			
 
				+            await inst._archive_file(file_path, "192.168.1.100")
			
 
				+
			
 
				+        assert file_path.name not in inst._pending_files
			
 
				+        assert not file_path.exists()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_queue_file_failure_path_pops_pending_and_unlinks(self, tmp_path):
			
 
				+        """Same invariant for _queue_file: a DB error during PendingUpload
			
 
				+        insert must not leak the in-flight marker or the temp file."""
			
 
				+        from backend.app.services.virtual_printer.manager import VirtualPrinterInstance
			
 
				+
			
 
				+        mock_db = AsyncMock()
			
 
				+        # Commit raises — emulating a DB connectivity error.
			
 
				+        mock_db.add = MagicMock()
			
 
				+        mock_db.commit = AsyncMock(side_effect=RuntimeError("db unreachable"))
			
 
				+        mock_session_factory = MagicMock()
			
 
				+        mock_session_ctx = AsyncMock()
			
 
				+        mock_session_ctx.__aenter__ = AsyncMock(return_value=mock_db)
			
 
				+        mock_session_ctx.__aexit__ = AsyncMock(return_value=False)
			
 
				+        mock_session_factory.return_value = mock_session_ctx
			
 
				+
			
 
				+        inst = VirtualPrinterInstance(
			
 
				+            vp_id=41,
			
 
				+            name="QueueFailCleanup",
			
 
				+            mode="review",
			
 
				+            model="C12",
			
 
				+            access_code="12345678",
			
 
				+            serial_suffix="391800041",
			
 
				+            base_dir=tmp_path,
			
 
				+            session_factory=mock_session_factory,
			
 
				+        )
			
 
				+        file_path = tmp_path / "cleanup-queue.3mf"
			
 
				+        file_path.write_bytes(b"fake3mf")
			
 
				+        inst._pending_files[file_path.name] = file_path
			
 
				+
			
 
				+        await inst._queue_file(file_path, "192.168.1.100")
			
 
				+
			
 
				+        assert file_path.name not in inst._pending_files
			
 
				+        assert not file_path.exists()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_add_to_print_queue_failure_path_pops_pending_and_unlinks(self, tmp_path):
			
 
				+        """Same invariant for _add_to_print_queue: a DB error or archive
			
 
				+        failure must not leak the in-flight marker or the temp file."""
			
 
				+        from backend.app.services.virtual_printer.manager import VirtualPrinterInstance
			
 
				+
			
 
				+        mock_db = AsyncMock()
			
 
				+        mock_db.add = MagicMock()
			
 
				+        mock_db.commit = AsyncMock()
			
 
				+        mock_db.execute = AsyncMock(side_effect=RuntimeError("queue insert blew up"))
			
 
				+        mock_session_factory = MagicMock()
			
 
				+        mock_session_ctx = AsyncMock()
			
 
				+        mock_session_ctx.__aenter__ = AsyncMock(return_value=mock_db)
			
 
				+        mock_session_ctx.__aexit__ = AsyncMock(return_value=False)
			
 
				+        mock_session_factory.return_value = mock_session_ctx
			
 
				+
			
 
				+        inst = VirtualPrinterInstance(
			
 
				+            vp_id=42,
			
 
				+            name="DispatchFailCleanup",
			
 
				+            mode="queue",
			
 
				+            model="C12",
			
 
				+            access_code="12345678",
			
 
				+            serial_suffix="391800042",
			
 
				+            auto_dispatch=True,
			
 
				+            base_dir=tmp_path,
			
 
				+            session_factory=mock_session_factory,
			
 
				+        )
			
 
				+        file_path = tmp_path / "cleanup-dispatch.3mf"
			
 
				+        file_path.write_bytes(b"fake3mf")
			
 
				+        inst._pending_files[file_path.name] = file_path
			
 
				+
			
 
				+        with patch(
			
 
				+            "backend.app.api.routes.settings.get_setting",
			
 
				+            new_callable=AsyncMock,
			
 
				+            return_value=None,
			
 
				+        ):
			
 
				+            await inst._add_to_print_queue(file_path, "192.168.1.100")
			
 
				+
			
 
				+        assert file_path.name not in inst._pending_files
			
 
				+        assert not file_path.exists()
			
 
				+
			
 
				+    # ========================================================================
			
 
				+    # Test for position=MAX+1 (audit-R2)
			
 
				+    # ========================================================================
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_add_to_print_queue_position_picks_max_plus_one(self, tmp_path):
			
 
				+        """VP-queue items previously got hardcoded `position=1`, colliding
			
 
				+        with existing items at position 1 and producing non-deterministic
			
 
				+        execution order. Now the position is chosen by `MAX(position)+1`
			
 
				+        against the target queue, matching the canonical `POST /print-queue/`
			
 
				+        path."""
			
 
				+        from backend.app.services.virtual_printer.manager import VirtualPrinterInstance
			
 
				+
			
 
				+        # Capture the inserted PrintQueueItem so we can assert on .position.
			
 
				+        added_items: list = []
			
 
				+
			
 
				+        class _RecordingDb:
			
 
				+            def __init__(self):
			
 
				+                self.add = lambda item: added_items.append(item)
			
 
				+                self.commit = AsyncMock()
			
 
				+
			
 
				+            async def execute(self, query):  # noqa: ARG002
			
 
				+                """Return a stub result whose `.scalar()` reports the existing
			
 
				+                MAX(position) for the target. Returning 7 means the new item
			
 
				+                should land at 8."""
			
 
				+                result = MagicMock()
			
 
				+                result.scalar = MagicMock(return_value=7)
			
 
				+                return result
			
 
				+
			
 
				+        mock_db = _RecordingDb()
			
 
				+        mock_session_factory = MagicMock()
			
 
				+        mock_session_ctx = AsyncMock()
			
 
				+        mock_session_ctx.__aenter__ = AsyncMock(return_value=mock_db)
			
 
				+        mock_session_ctx.__aexit__ = AsyncMock(return_value=False)
			
 
				+        mock_session_factory.return_value = mock_session_ctx
			
 
				+
			
 
				+        inst = VirtualPrinterInstance(
			
 
				+            vp_id=43,
			
 
				+            name="PositionMaxPlusOne",
			
 
				+            mode="queue",
			
 
				+            model="C12",
			
 
				+            access_code="12345678",
			
 
				+            serial_suffix="391800043",
			
 
				+            target_printer_id=99,
			
 
				+            auto_dispatch=True,
			
 
				+            base_dir=tmp_path,
			
 
				+            session_factory=mock_session_factory,
			
 
				+        )
			
 
				+        file_path = tmp_path / "next-position.3mf"
			
 
				+        file_path.write_bytes(b"fake3mf")
			
 
				+
			
 
				+        mock_archive = MagicMock()
			
 
				+        mock_archive.id = 555
			
 
				+        mock_archive.printer_id = None
			
 
				+        mock_archive.filename = "next-position.3mf"
			
 
				+        mock_archive.print_name = "next-position"
			
 
				+        mock_archive.status = "archived"
			
 
				+
			
 
				+        with (
			
 
				+            patch(
			
 
				+                "backend.app.api.routes.settings.get_setting",
			
 
				+                new_callable=AsyncMock,
			
 
				+                return_value=None,
			
 
				+            ),
			
 
				+            patch(
			
 
				+                "backend.app.services.archive.ArchiveService.archive_print",
			
 
				+                new_callable=AsyncMock,
			
 
				+                return_value=mock_archive,
			
 
				+            ),
			
 
				+            patch(
			
 
				+                "backend.app.core.websocket.ws_manager.send_archive_created",
			
 
				+                new_callable=AsyncMock,
			
 
				+            ),
			
 
				+        ):
			
 
				+            await inst._add_to_print_queue(file_path, "192.168.1.100")
			
 
				+
			
 
				+        # One queue item was added.
			
 
				+        assert len(added_items) == 1
			
 
				+        queue_item = added_items[0]
			
 
				+        # Position = max(7) + 1 = 8 — NOT the legacy hardcoded 1.
			
 
				+        assert queue_item.position == 8
			
 
				+
			
 
				 
			
 
				 class TestVirtualPrinterManager:
			
 
				     """Tests for VirtualPrinterManager orchestrator."""
			
@@ -1051,7 +1265,7 @@ class TestVirtualPrinterManager:
 
				         status = manager.get_status()
			
 
				         assert status["enabled"] is False
			
 
				         assert status["running"] is False
			
 
				-        assert status["mode"] == "immediate"
			
 
				+        assert status["mode"] == "archive"
			
 
				 
			
 
				     def test_manager_is_enabled_with_instance(self, manager, tmp_path):
			
 
				         """Verify is_enabled is True when instances exist."""
			
@@ -1060,7 +1274,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="Test",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1077,7 +1291,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="Test",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1121,7 +1335,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="Bambuddy",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1135,7 +1349,7 @@ class TestVirtualPrinterManager:
 
				         status = manager.get_status()
			
 
				         assert status["enabled"] is True
			
 
				         assert status["running"] is True
			
 
				-        assert status["mode"] == "immediate"
			
 
				+        assert status["mode"] == "archive"
			
 
				         assert status["name"] == "Bambuddy"
			
 
				         assert status["serial"] == "01S00A391800001"
			
 
				         assert status["model"] == "C11"
			
@@ -1150,7 +1364,7 @@ class TestVirtualPrinterManager:
 
				             inst = VirtualPrinterInstance(
			
 
				                 vp_id=i,
			
 
				                 name=f"VP{i}",
			
 
				-                mode="immediate",
			
 
				+                mode="archive",
			
 
				                 model="C11",
			
 
				                 access_code="12345678",
			
 
				                 serial_suffix=f"39180000{i}",
			
@@ -1172,7 +1386,7 @@ class TestVirtualPrinterManager:
 
				             inst = VirtualPrinterInstance(
			
 
				                 vp_id=i,
			
 
				                 name=f"VP{i}",
			
 
				-                mode="immediate",
			
 
				+                mode="archive",
			
 
				                 model="C11",
			
 
				                 access_code="12345678",
			
 
				                 serial_suffix=f"39180000{i}",
			
@@ -1194,7 +1408,7 @@ class TestVirtualPrinterManager:
 
				             "id": 1,
			
 
				             "name": "TestVP",
			
 
				             "enabled": True,
			
 
				-            "mode": "immediate",
			
 
				+            "mode": "archive",
			
 
				             "model": "C11",
			
 
				             "access_code": "12345678",
			
 
				             "serial_suffix": "391800001",
			
@@ -1203,6 +1417,7 @@ class TestVirtualPrinterManager:
 
				             "target_printer_id": None,
			
 
				             "auto_dispatch": True,
			
 
				             "tailscale_disabled": True,  # Opt-in default (#1070 UX fix)
			
 
				+            "queue_force_color_match": False,  # default — must be explicit so MagicMock truthiness doesn't trip the change detector
			
 
				             "position": 0,
			
 
				         }
			
 
				         defaults.update(overrides)
			
@@ -1232,7 +1447,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestVP",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1241,8 +1456,8 @@ class TestVirtualPrinterManager:
 
				         inst.stop_server = AsyncMock()
			
 
				         manager._instances[1] = inst
			
 
				 
			
 
				-        # DB says mode changed to "archive"
			
 
				-        db_vp = self._make_db_vp(mode="archive")
			
 
				+        # DB says mode changed to "review"
			
 
				+        db_vp = self._make_db_vp(mode="review")
			
 
				         self._setup_sync_mocks(manager, [db_vp], tmp_path)
			
 
				 
			
 
				         with patch.object(manager, "remove_instance", new_callable=AsyncMock) as mock_remove:
			
@@ -1264,7 +1479,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestVP",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1294,7 +1509,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestVP",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1319,7 +1534,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestVP",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1350,7 +1565,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestVP",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -1385,7 +1600,7 @@ class TestVirtualPrinterManager:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=1,
			
 
				             name="TestVP",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800001",
			
@@ -2097,7 +2312,7 @@ class TestVirtualPrinterManagerDirectories:
 
				         VirtualPrinterInstance(
			
 
				             vp_id=42,
			
 
				             name="Test",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="C11",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800042",
			
@@ -2187,7 +2402,7 @@ class TestVirtualPrinterInstanceIPOverride:
 
				         return VirtualPrinterInstance(
			
 
				             vp_id=20,
			
 
				             name="IPTest",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="BL-P001",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800020",
			
@@ -2224,7 +2439,7 @@ class TestVirtualPrinterInstanceIPOverride:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=21,
			
 
				             name="NoRemote",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="BL-P001",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800021",
			
@@ -2250,7 +2465,7 @@ class TestVirtualPrinterInstanceIPOverride:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=22,
			
 
				             name="NoIPs",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="BL-P001",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800022",
			
@@ -2383,7 +2598,7 @@ class TestBindServer:
 
				         inst = VirtualPrinterInstance(
			
 
				             vp_id=99,
			
 
				             name="Bambuddy",
			
 
				-            mode="immediate",
			
 
				+            mode="archive",
			
 
				             model="BL-P001",
			
 
				             access_code="12345678",
			
 
				             serial_suffix="391800099",
			
@@ -2391,11 +2606,34 @@ class TestBindServer:
 
				             base_dir=tmp_path,
			
 
				         )
			
 
				 
			
 
				+        # Each mocked child service exposes a real asyncio.Event for the
			
 
				+        # readiness barrier added in start_server (set on instantiation so
			
 
				+        # the barrier returns immediately in tests).
			
 
				+        ready_event = asyncio.Event()
			
 
				+        ready_event.set()
			
 
				+
			
 
				+        def with_ready(*_args, **_kwargs):
			
 
				+            child = MagicMock()
			
 
				+            child.ready = ready_event
			
 
				+            return child
			
 
				+
			
 
				         with (
			
 
				-            patch("backend.app.services.virtual_printer.manager.VirtualPrinterSSDPServer"),
			
 
				-            patch("backend.app.services.virtual_printer.manager.VirtualPrinterFTPServer"),
			
 
				-            patch("backend.app.services.virtual_printer.manager.SimpleMQTTServer"),
			
 
				-            patch("backend.app.services.virtual_printer.manager.BindServer") as mock_bind_cls,
			
 
				+            patch(
			
 
				+                "backend.app.services.virtual_printer.manager.VirtualPrinterSSDPServer",
			
 
				+                side_effect=with_ready,
			
 
				+            ),
			
 
				+            patch(
			
 
				+                "backend.app.services.virtual_printer.manager.VirtualPrinterFTPServer",
			
 
				+                side_effect=with_ready,
			
 
				+            ),
			
 
				+            patch(
			
 
				+                "backend.app.services.virtual_printer.manager.SimpleMQTTServer",
			
 
				+                side_effect=with_ready,
			
 
				+            ),
			
 
				+            patch(
			
 
				+                "backend.app.services.virtual_printer.manager.BindServer",
			
 
				+                side_effect=with_ready,
			
 
				+            ) as mock_bind_cls,
			
 
				             patch.object(inst._cert_service, "delete_printer_certificate"),
			
 
				             patch.object(
			
 
				                 inst._cert_service,
			
--- a/backend/tests/unit/services/test_vp_diagnostic.py
+++ b/backend/tests/unit/services/test_vp_diagnostic.py
@@ -19,7 +19,7 @@ def _vp(**overrides):
 
				     base = {
			
 
				         "id": 1,
			
 
				         "name": "Test VP",
			
 
				-        "mode": "immediate",
			
 
				+        "mode": "archive",
			
 
				         "enabled": True,
			
 
				         "bind_ip": "192.168.1.50",
			
 
				         "access_code": "12345678",
			
--- a/backend/tests/unit/test_archive_run_aggregation.py
+++ b/backend/tests/unit/test_archive_run_aggregation.py
@@ -245,3 +245,254 @@ async def test_soft_delete_keeps_runs_for_stats(
 
				     stats = (await async_client.get("/api/v1/archives/stats")).json()
			
 
				     assert stats["total_prints"] >= 1
			
 
				     assert stats["total_filament_grams"] >= 75.0
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+@pytest.mark.integration
			
 
				+async def test_time_accuracy_excludes_multi_plate_plate_by_plate_outliers(
			
 
				+    async_client: AsyncClient, archive_factory, printer_factory, db_session
			
 
				+):
			
 
				+    """Per-run accuracy clamps to a plausible 50%-200% band so multi-plate
			
 
				+    archives printed plate-by-plate don't poison the printer-level average.
			
 
				+
			
 
				+    Pre-#1593 the parser stored plate-1-only time in
			
 
				+    ``PrintArchive.print_time_seconds``, so a plate-by-plate run produced a
			
 
				+    near-100% ratio by accident. Post-#1593 the field is the sum across
			
 
				+    plates, so each plate-by-plate run produces estimate/actual = N×100%
			
 
				+    for an N-plate file. Without the band filter a single 3-plate file
			
 
				+    printed plate-by-plate would drag the printer's accuracy reading to
			
 
				+    ~300%, which is pure noise. The metric is designed for the
			
 
				+    single-plate-file case and should reflect real slicer drift there.
			
 
				+    """
			
 
				+    printer = await printer_factory()
			
 
				+
			
 
				+    # Archive 1: single-plate file. Estimate 3600s, actual 3700s
			
 
				+    # → ratio 97.3% (well within band).
			
 
				+    single = await archive_factory(
			
 
				+        printer.id,
			
 
				+        print_time_seconds=3600,
			
 
				+        with_run=False,
			
 
				+    )
			
 
				+    db_session.add(
			
 
				+        PrintLogEntry(
			
 
				+            archive_id=single.id,
			
 
				+            printer_id=printer.id,
			
 
				+            status="completed",
			
 
				+            duration_seconds=3700,
			
 
				+        )
			
 
				+    )
			
 
				+
			
 
				+    # Archive 2: multi-plate file (3 plates totaling 18000s). Two runs
			
 
				+    # printed plate-by-plate at ~6000s each — ratio 18000/6000 = 300%.
			
 
				+    # Both must be filtered out so the printer average stays at the
			
 
				+    # single-plate file's 97.3% reading.
			
 
				+    multi = await archive_factory(
			
 
				+        printer.id,
			
 
				+        print_time_seconds=18000,
			
 
				+        with_run=False,
			
 
				+    )
			
 
				+    db_session.add(
			
 
				+        PrintLogEntry(
			
 
				+            archive_id=multi.id,
			
 
				+            printer_id=printer.id,
			
 
				+            status="completed",
			
 
				+            duration_seconds=6000,
			
 
				+        )
			
 
				+    )
			
 
				+    db_session.add(
			
 
				+        PrintLogEntry(
			
 
				+            archive_id=multi.id,
			
 
				+            printer_id=printer.id,
			
 
				+            status="completed",
			
 
				+            duration_seconds=6100,
			
 
				+        )
			
 
				+    )
			
 
				+    await db_session.commit()
			
 
				+
			
 
				+    body = (await async_client.get("/api/v1/archives/stats")).json()
			
 
				+    assert body["average_time_accuracy"] == pytest.approx(97.3, abs=0.1)
			
 
				+    assert body["time_accuracy_by_printer"][str(printer.id)] == pytest.approx(97.3, abs=0.1)
			
 
				+
			
 
				+
			
 
				+# ---------------------------------------------------------------------------
			
 
				+# #1608: compute_time_accuracy suppresses the per-card badge for multi-run
			
 
				+# archives where the whole-file estimate is incommensurable with the
			
 
				+# latest-run actual.
			
 
				+# ---------------------------------------------------------------------------
			
 
				+
			
 
				+
			
 
				+class TestComputeTimeAccuracyMultiRun:
			
 
				+    """The card-level ``compute_time_accuracy`` runs against the archive's own
			
 
				+    ``started_at`` / ``completed_at`` (latest run only) and
			
 
				+    ``print_time_seconds`` (post-#1593 sum across plates). For multi-run
			
 
				+    archives those describe different scopes — a 3-plate file printed
			
 
				+    plate-by-plate over 3 runs produces estimate/actual = 300% → +200% badge,
			
 
				+    which is pure noise. The reporter (#1608, archive #65) verified the
			
 
				+    bug surfaces at +188% for a 3-plate file with 9 runs.
			
 
				+
			
 
				+    The fix: when the archive has more than one logged run, suppress BOTH
			
 
				+    fields. The frontend then falls through to ``print_time_seconds`` for
			
 
				+    the time display (so the user sees the slicer's whole-file estimate
			
 
				+    instead of one run's wall-clock) and hides the badge.
			
 
				+    """
			
 
				+
			
 
				+    def _make_archive(self, *, print_time_seconds, started_at, completed_at, status="completed"):
			
 
				+        from types import SimpleNamespace
			
 
				+
			
 
				+        return SimpleNamespace(
			
 
				+            print_time_seconds=print_time_seconds,
			
 
				+            started_at=started_at,
			
 
				+            completed_at=completed_at,
			
 
				+            status=status,
			
 
				+        )
			
 
				+
			
 
				+    def test_single_run_keeps_original_behaviour(self):
			
 
				+        """``run_count == 1`` is the case the badge was designed for —
			
 
				+        compute and return both actual + accuracy as before."""
			
 
				+        from backend.app.api.routes.archives import compute_time_accuracy
			
 
				+
			
 
				+        archive = self._make_archive(
			
 
				+            print_time_seconds=3600,
			
 
				+            started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 1, 11, 0, tzinfo=timezone.utc),
			
 
				+        )
			
 
				+        result = compute_time_accuracy(archive, run_aggregate={"run_count": 1})
			
 
				+
			
 
				+        assert result["actual_time_seconds"] == 3600
			
 
				+        assert result["time_accuracy"] == 100.0
			
 
				+
			
 
				+    def test_no_run_aggregate_keeps_original_behaviour(self):
			
 
				+        """Endpoints that don't yet load run_aggregates (legacy callers, or
			
 
				+        contexts where the data isn't relevant) must keep the pre-fix
			
 
				+        per-archive computation — never silently drop the badge."""
			
 
				+        from backend.app.api.routes.archives import compute_time_accuracy
			
 
				+
			
 
				+        archive = self._make_archive(
			
 
				+            print_time_seconds=3600,
			
 
				+            started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 1, 10, 50, tzinfo=timezone.utc),
			
 
				+        )
			
 
				+        result = compute_time_accuracy(archive)  # no run_aggregate
			
 
				+
			
 
				+        assert result["actual_time_seconds"] == 3000
			
 
				+        assert result["time_accuracy"] == 120.0  # 3600/3000
			
 
				+
			
 
				+    def test_multi_run_archive_suppresses_both_fields(self):
			
 
				+        """Reporter's case (archive #65, 3 plates, 9 logged runs): one-run
			
 
				+        actual (6364s) vs whole-file estimate (18354s) → +188% badge that
			
 
				+        means nothing. Multi-run must clear both fields so the card falls
			
 
				+        through to the estimate display with no badge."""
			
 
				+        from backend.app.api.routes.archives import compute_time_accuracy
			
 
				+
			
 
				+        archive = self._make_archive(
			
 
				+            print_time_seconds=18354,
			
 
				+            started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 1, 11, 46, 4, tzinfo=timezone.utc),  # ~6364s
			
 
				+        )
			
 
				+        result = compute_time_accuracy(archive, run_aggregate={"run_count": 9})
			
 
				+
			
 
				+        assert result["actual_time_seconds"] is None
			
 
				+        assert result["time_accuracy"] is None
			
 
				+
			
 
				+    def test_run_count_zero_keeps_original_behaviour(self):
			
 
				+        """A run_aggregate that exists but reports zero runs (edge case from
			
 
				+        the LEFT JOIN-style helper) must not trigger suppression — that's
			
 
				+        not the multi-run shape, it's the no-runs shape, and the
			
 
				+        per-archive timestamps are still meaningful (the archive was
			
 
				+        marked completed without a PrintLogEntry trail, e.g. legacy
			
 
				+        imports)."""
			
 
				+        from backend.app.api.routes.archives import compute_time_accuracy
			
 
				+
			
 
				+        archive = self._make_archive(
			
 
				+            print_time_seconds=3600,
			
 
				+            started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 1, 11, 0, tzinfo=timezone.utc),
			
 
				+        )
			
 
				+        result = compute_time_accuracy(archive, run_aggregate={"run_count": 0})
			
 
				+
			
 
				+        assert result["actual_time_seconds"] == 3600
			
 
				+        assert result["time_accuracy"] == 100.0
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+@pytest.mark.integration
			
 
				+async def test_archive_list_suppresses_time_accuracy_for_multi_run_archives(
			
 
				+    async_client: AsyncClient, archive_factory, printer_factory, db_session
			
 
				+):
			
 
				+    """#1608 integration: the card response from the main list endpoint
			
 
				+    must report ``actual_time_seconds = null`` and ``time_accuracy = null``
			
 
				+    for an archive with multiple logged runs, so the frontend renders the
			
 
				+    slicer estimate without the misleading +N% badge."""
			
 
				+    printer = await printer_factory()
			
 
				+
			
 
				+    # 3-plate file: estimate is the whole-file sum, latest run is one plate.
			
 
				+    archive = await archive_factory(
			
 
				+        printer.id,
			
 
				+        status="completed",
			
 
				+        print_time_seconds=18354,  # all-plates estimate (post-#1593 parser)
			
 
				+        started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+        completed_at=datetime(2026, 5, 1, 11, 46, 4, tzinfo=timezone.utc),  # ~6364s = one plate
			
 
				+        with_run=False,
			
 
				+    )
			
 
				+    # Three runs each ~6364s — plate-by-plate.
			
 
				+    for day in (1, 2, 3):
			
 
				+        db_session.add(
			
 
				+            PrintLogEntry(
			
 
				+                archive_id=archive.id,
			
 
				+                printer_id=archive.printer_id,
			
 
				+                status="completed",
			
 
				+                started_at=datetime(2026, 5, day, 10, 0, tzinfo=timezone.utc),
			
 
				+                completed_at=datetime(2026, 5, day, 11, 46, 4, tzinfo=timezone.utc),
			
 
				+                duration_seconds=6364,
			
 
				+            )
			
 
				+        )
			
 
				+    await db_session.commit()
			
 
				+
			
 
				+    response = await async_client.get("/api/v1/archives/")
			
 
				+    assert response.status_code == 200
			
 
				+    row = next(r for r in response.json() if r["id"] == archive.id)
			
 
				+
			
 
				+    # Frontend renders archive.actual_time_seconds || archive.print_time_seconds —
			
 
				+    # with actual cleared, it falls through to the estimate; with accuracy
			
 
				+    # cleared, no badge renders.
			
 
				+    assert row["actual_time_seconds"] is None, "multi-run actual is incommensurable with the estimate — must be null"
			
 
				+    assert row["time_accuracy"] is None, "no badge for multi-run archives — the scopes don't match"
			
 
				+    # The estimate itself is preserved so the card has something to display.
			
 
				+    assert row["print_time_seconds"] == 18354
			
 
				+    assert row["run_count"] == 3
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+@pytest.mark.integration
			
 
				+async def test_archive_list_keeps_time_accuracy_for_single_run_archives(
			
 
				+    async_client: AsyncClient, archive_factory, printer_factory, db_session
			
 
				+):
			
 
				+    """Sanity check for the #1608 fix: single-run archives (the case the
			
 
				+    badge was designed for) keep their original badge behaviour."""
			
 
				+    printer = await printer_factory()
			
 
				+
			
 
				+    archive = await archive_factory(
			
 
				+        printer.id,
			
 
				+        status="completed",
			
 
				+        print_time_seconds=3600,
			
 
				+        started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+        completed_at=datetime(2026, 5, 1, 11, 0, tzinfo=timezone.utc),
			
 
				+        with_run=False,
			
 
				+    )
			
 
				+    db_session.add(
			
 
				+        PrintLogEntry(
			
 
				+            archive_id=archive.id,
			
 
				+            printer_id=archive.printer_id,
			
 
				+            status="completed",
			
 
				+            started_at=datetime(2026, 5, 1, 10, 0, tzinfo=timezone.utc),
			
 
				+            completed_at=datetime(2026, 5, 1, 11, 0, tzinfo=timezone.utc),
			
 
				+            duration_seconds=3600,
			
 
				+        )
			
 
				+    )
			
 
				+    await db_session.commit()
			
 
				+
			
 
				+    row = next(r for r in (await async_client.get("/api/v1/archives/")).json() if r["id"] == archive.id)
			
 
				+
			
 
				+    assert row["actual_time_seconds"] == 3600
			
 
				+    assert row["time_accuracy"] == 100.0
			
 
				+    assert row["run_count"] == 1
			
--- a/backend/tests/unit/test_fallback_archive_mqtt_filament.py
+++ b/backend/tests/unit/test_fallback_archive_mqtt_filament.py
@@ -0,0 +1,293 @@
 
				+"""Tests for _extract_filament_data_from_mqtt (#1533).
			
 
				+
			
 
				+The fallback PrintArchive path in main.py fires when the source 3MF can't
			
 
				+be downloaded from the printer at print start — common on P1S / A1 / P2S
			
 
				+firmwares that lock the file during printing. Before this fix the
			
 
				+fallback archive had every filament field NULL even though the MQTT
			
 
				+print-start payload already carried the AMS state and the slicer's
			
 
				+slot-per-print-filament mapping. The helper extracts a comma-separated
			
 
				+``filament_type`` / ``filament_color`` from that payload so the inventory
			
 
				+views can at least show what's loaded, and operators planning AMS
			
 
				+expansion can count filaments per print.
			
 
				+"""
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.main import _extract_filament_data_from_mqtt
			
 
				+
			
 
				+
			
 
				+def _ams_unit(unit_id: int, trays: list[dict]) -> dict:
			
 
				+    return {"id": unit_id, "tray": trays}
			
 
				+
			
 
				+
			
 
				+def _tray(tray_id: int, ttype: str | None, color: str | None) -> dict:
			
 
				+    out: dict = {"id": tray_id}
			
 
				+    if ttype is not None:
			
 
				+        out["tray_type"] = ttype
			
 
				+    if color is not None:
			
 
				+        out["tray_color"] = color
			
 
				+    return out
			
 
				+
			
 
				+
			
 
				+class TestExtractFilamentDataFromMqtt:
			
 
				+    def test_empty_payload_returns_empty_dict(self):
			
 
				+        assert _extract_filament_data_from_mqtt({}) == {}
			
 
				+        assert _extract_filament_data_from_mqtt({"ams": None}) == {}
			
 
				+        assert _extract_filament_data_from_mqtt({"ams": {}}) == {}
			
 
				+        assert _extract_filament_data_from_mqtt({"ams": {"ams": []}}) == {}
			
 
				+
			
 
				+    def test_no_loaded_slots_returns_empty(self):
			
 
				+        """All slots empty (no tray_type) → nothing to report."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(i, "", "") for i in range(4)]),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        assert _extract_filament_data_from_mqtt(data) == {}
			
 
				+
			
 
				+    def test_no_mapping_lists_all_loaded_slots_sorted(self):
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(
			
 
				+                        0,
			
 
				+                        [
			
 
				+                            _tray(0, "PLA", "FF0000"),
			
 
				+                            _tray(1, "PETG", "00FF00"),
			
 
				+                            _tray(2, "", ""),  # Empty slot — skipped.
			
 
				+                            _tray(3, "ABS", "0000ff"),
			
 
				+                        ],
			
 
				+                    ),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        result = _extract_filament_data_from_mqtt(data)
			
 
				+        # Order is by ascending global tray id, colors uppercased.
			
 
				+        assert result == {"filament_type": "PLA,PETG,ABS", "filament_color": "FF0000,00FF00,0000FF"}
			
 
				+
			
 
				+    def test_ams_mapping_narrows_to_used_slots(self):
			
 
				+        """The slicer's slot-per-print-filament mapping wins — only used
			
 
				+        slots contribute, in the slicer's order (which is the order the
			
 
				+        print materially consumes them)."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(
			
 
				+                        0,
			
 
				+                        [
			
 
				+                            _tray(0, "PLA", "FF0000"),
			
 
				+                            _tray(1, "PETG", "00FF00"),
			
 
				+                            _tray(2, "ABS", "0000FF"),
			
 
				+                            _tray(3, "TPU", "FFFF00"),
			
 
				+                        ],
			
 
				+                    ),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        # Print uses slots 3 then 0 then 1 (slot 2 untouched, no entry).
			
 
				+        result = _extract_filament_data_from_mqtt(data, ams_mapping=[3, 0, 1])
			
 
				+        assert result == {"filament_type": "TPU,PLA,PETG", "filament_color": "FFFF00,FF0000,00FF00"}
			
 
				+
			
 
				+    def test_ams_mapping_with_vt_tray_sentinels_filtered_out(self):
			
 
				+        """ams_mapping entries equal to -1 represent the VT tray (external
			
 
				+        spool feed). We have no AMS tray data for them — they must be
			
 
				+        skipped, not treated as global tray id 0."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(
			
 
				+                        0,
			
 
				+                        [
			
 
				+                            _tray(0, "PLA", "FF0000"),
			
 
				+                            _tray(1, "PETG", "00FF00"),
			
 
				+                        ],
			
 
				+                    ),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        result = _extract_filament_data_from_mqtt(data, ams_mapping=[-1, 0, 1])
			
 
				+        assert result == {"filament_type": "PLA,PETG", "filament_color": "FF0000,00FF00"}
			
 
				+
			
 
				+    def test_dual_ams_global_ids_use_unit4_offset(self):
			
 
				+        """A dual-AMS rig has unit 0 → trays 0-3, unit 1 → trays 4-7.
			
 
				+        ``ams_mapping=4`` must resolve to unit 1, tray 0 — not unit 0."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(0, "PLA", "FF0000")]),
			
 
				+                    _ams_unit(1, [_tray(0, "PETG-CF", "112233")]),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        result = _extract_filament_data_from_mqtt(data, ams_mapping=[4, 0])
			
 
				+        assert result == {"filament_type": "PETG-CF,PLA", "filament_color": "112233,FF0000"}
			
 
				+
			
 
				+    def test_mapping_pointing_at_unknown_slot_falls_through_to_known_only(self):
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(0, "PLA", "FF0000")]),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        # Slot 7 isn't in our AMS — entry skipped, only slot 0 remains.
			
 
				+        result = _extract_filament_data_from_mqtt(data, ams_mapping=[7, 0])
			
 
				+        assert result == {"filament_type": "PLA", "filament_color": "FF0000"}
			
 
				+
			
 
				+    def test_mapping_entirely_unknown_returns_empty(self):
			
 
				+        """If every mapped slot is unknown the helper returns {} rather
			
 
				+        than silently misreporting from the all-slots fallback — the
			
 
				+        slicer was explicit about which slots to use."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(0, "PLA", "FF0000")]),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        assert _extract_filament_data_from_mqtt(data, ams_mapping=[5, 6]) == {}
			
 
				+
			
 
				+    def test_color_truncation_at_column_limit(self):
			
 
				+        """filament_color column is VARCHAR(200); long multi-color prints
			
 
				+        must not exceed it."""
			
 
				+        # 16 trays of 6-char colors + 15 commas = 96+15 = 111 chars. Safe.
			
 
				+        # Construct an oversized synthetic case with many distinct colors.
			
 
				+        trays = [_tray(i, "PLA", f"{i:06X}") for i in range(4)]
			
 
				+        data = {"ams": {"ams": [_ams_unit(u, trays) for u in range(8)]}}
			
 
				+        result = _extract_filament_data_from_mqtt(data)
			
 
				+        assert "filament_color" in result
			
 
				+        assert len(result["filament_color"]) <= 200
			
 
				+
			
 
				+    def test_type_truncation_at_column_limit(self):
			
 
				+        """filament_type column is VARCHAR(50). Many filaments must truncate."""
			
 
				+        # 16 PETG-CF entries: 7 chars × 16 + 15 commas = 127 chars.
			
 
				+        trays = [_tray(i, "PETG-CF", "AABBCC") for i in range(4)]
			
 
				+        data = {"ams": {"ams": [_ams_unit(u, trays) for u in range(4)]}}
			
 
				+        result = _extract_filament_data_from_mqtt(data)
			
 
				+        assert "filament_type" in result
			
 
				+        assert len(result["filament_type"]) <= 50
			
 
				+
			
 
				+    def test_color_missing_only_emits_type(self):
			
 
				+        """A tray with type but blank color still contributes to filament_type."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(0, "PLA", "")]),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        result = _extract_filament_data_from_mqtt(data)
			
 
				+        assert result == {"filament_type": "PLA"}
			
 
				+        # filament_color absent — not empty string.
			
 
				+        assert "filament_color" not in result
			
 
				+
			
 
				+    def test_malformed_unit_skipped_without_crash(self):
			
 
				+        """Defensive: unexpected MQTT shapes (non-dict in ams list, missing
			
 
				+        id, string tray.id) must not raise. The fallback-archive write
			
 
				+        runs in a hot path during print start — anything that throws here
			
 
				+        would bubble up and break the print log entirely."""
			
 
				+        data = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    "garbage",
			
 
				+                    {"id": "not-an-int", "tray": []},
			
 
				+                    _ams_unit(0, [_tray(0, "PLA", "FF0000"), {"id": "x", "tray_type": "PETG"}]),
			
 
				+                ],
			
 
				+            }
			
 
				+        }
			
 
				+        result = _extract_filament_data_from_mqtt(data)
			
 
				+        # Only the well-formed entry contributes; no exception.
			
 
				+        assert result.get("filament_type") == "PLA"
			
 
				+
			
 
				+    @pytest.mark.parametrize("data", [None, {}, {"ams": "weird-string"}])
			
 
				+    def test_garbage_top_level_is_empty(self, data):
			
 
				+        assert _extract_filament_data_from_mqtt(data or {}) == {}
			
 
				+
			
 
				+
			
 
				+class TestOnPrintStartCallbackShape:
			
 
				+    """Regression: the callback wrapper shape the bambu_mqtt service
			
 
				+    actually hands to ``on_print_start`` at runtime (#1533 follow-up).
			
 
				+
			
 
				+    The original #1533 fix only handled the bare ``{"ams": {"ams": [...]}}``
			
 
				+    inner shape, but the call site at ``backend/app/main.py::on_print_start``
			
 
				+    receives the wrapper
			
 
				+    ``{"filename", "subtask_name", "remaining_time", "raw_data": <mqtt>,
			
 
				+       "ams_mapping"}`` from ``backend/app/services/bambu_mqtt.py:2971-2980``.
			
 
				+    The lookup at ``data["ams"]`` therefore missed every real print and
			
 
				+    fallback archives kept their filament fields NULL — the exact regression
			
 
				+    the fix was supposed to close. Reproduced from JmanB52D's support
			
 
				+    bundle whose print start log line showed
			
 
				+    ``AMS 0: T0(type=PETG, color=FFFFFFFF, …)`` was sitting right there at
			
 
				+    ``data["raw_data"]["ams"]["ams"][0]["tray"][0]``.
			
 
				+    """
			
 
				+
			
 
				+    def test_callback_wrapper_payload_resolves_raw_data_path(self):
			
 
				+        """The wrapper-shape payload must produce the same result the
			
 
				+        inner-shape payload would."""
			
 
				+        inner = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(0, "PETG", "FFFFFFFF")]),
			
 
				+                ],
			
 
				+            },
			
 
				+        }
			
 
				+        wrapper = {
			
 
				+            "filename": "/data/Metadata/plate_1.gcode",
			
 
				+            "subtask_name": "xyz-10mm-calibration-cube",
			
 
				+            "remaining_time": 1200,
			
 
				+            "raw_data": inner,
			
 
				+            "ams_mapping": [0],
			
 
				+        }
			
 
				+        result = _extract_filament_data_from_mqtt(wrapper, ams_mapping=[0])
			
 
				+        # The 6-char rgba `FFFFFF` is what the AMS reports (with `FF` alpha
			
 
				+        # tail trimmed by the catalog) — the helper preserves whatever the
			
 
				+        # firmware sends.
			
 
				+        assert result == {"filament_type": "PETG", "filament_color": "FFFFFFFF"}
			
 
				+
			
 
				+    def test_wrapper_with_no_ams_mapping_falls_back_to_all_loaded(self):
			
 
				+        """Wrapper shape without an ams_mapping behaves the same as the
			
 
				+        inner-shape no-mapping path: lists every loaded slot."""
			
 
				+        inner = {
			
 
				+            "ams": {
			
 
				+                "ams": [
			
 
				+                    _ams_unit(0, [_tray(0, "PLA", "FF0000"), _tray(1, "PETG", "00FF00")]),
			
 
				+                ],
			
 
				+            },
			
 
				+        }
			
 
				+        wrapper = {"raw_data": inner}
			
 
				+        result = _extract_filament_data_from_mqtt(wrapper)
			
 
				+        assert result == {"filament_type": "PLA,PETG", "filament_color": "FF0000,00FF00"}
			
 
				+
			
 
				+    def test_inner_shape_still_supported_after_wrapper_lookup(self):
			
 
				+        """Existing callers that pass the inner shape directly (e.g. the
			
 
				+        unit tests above) must keep working — the new lookup is additive."""
			
 
				+        inner = {
			
 
				+            "ams": {
			
 
				+                "ams": [_ams_unit(0, [_tray(0, "ASA", "112233")])],
			
 
				+            },
			
 
				+        }
			
 
				+        assert _extract_filament_data_from_mqtt(inner) == {
			
 
				+            "filament_type": "ASA",
			
 
				+            "filament_color": "112233",
			
 
				+        }
			
 
				+
			
 
				+    def test_wrapper_with_missing_raw_data_returns_empty(self):
			
 
				+        """No raw_data wrapper AND no top-level ams → empty, no raise."""
			
 
				+        wrapper = {"filename": "foo.gcode", "ams_mapping": [0]}
			
 
				+        assert _extract_filament_data_from_mqtt(wrapper, ams_mapping=[0]) == {}
			
 
				+
			
 
				+    def test_wrapper_with_non_dict_raw_data_falls_through_to_inner_lookup(self):
			
 
				+        """Defensive: a junk raw_data value (string / None) shouldn't crash
			
 
				+        and shouldn't shadow a present inner ``ams`` either. Lets us catch
			
 
				+        the case where MQTT decoding partially fails but the rest of the
			
 
				+        payload is fine."""
			
 
				+        wrapper = {
			
 
				+            "raw_data": "garbage",
			
 
				+            "ams": {"ams": [_ams_unit(0, [_tray(0, "PLA", "FF0000")])]},
			
 
				+        }
			
 
				+        assert _extract_filament_data_from_mqtt(wrapper) == {
			
 
				+            "filament_type": "PLA",
			
 
				+            "filament_color": "FF0000",
			
 
				+        }
			
--- a/backend/tests/unit/test_filename_validation.py
+++ b/backend/tests/unit/test_filename_validation.py
@@ -0,0 +1,120 @@
 
				+"""Validator tests for FAT32/exFAT-safe print filenames (#1540)."""
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.utils.filename import (
			
 
				+    INVALID_FILENAME_CHARS,
			
 
				+    InvalidFilenameError,
			
 
				+    derive_remote_filename,
			
 
				+    validate_print_filename,
			
 
				+)
			
 
				+
			
 
				+
			
 
				+class TestValidatePrintFilename:
			
 
				+    @pytest.mark.parametrize(
			
 
				+        "name",
			
 
				+        [
			
 
				+            "model.3mf",
			
 
				+            "Bersaglio.gcode.3mf",
			
 
				+            "Plate 1.3mf",
			
 
				+            "プリント.3mf",
			
 
				+            "model_v2-final.3mf",
			
 
				+            "a.3mf",
			
 
				+        ],
			
 
				+    )
			
 
				+    def test_valid_names_accepted(self, name: str) -> None:
			
 
				+        validate_print_filename(name)
			
 
				+
			
 
				+    @pytest.mark.parametrize("char", list(INVALID_FILENAME_CHARS))
			
 
				+    def test_each_invalid_char_rejected(self, char: str) -> None:
			
 
				+        with pytest.raises(InvalidFilenameError) as exc_info:
			
 
				+            validate_print_filename(f"L{char}R.3mf")
			
 
				+        assert exc_info.value.char == char
			
 
				+
			
 
				+    def test_pipe_from_issue_1540(self) -> None:
			
 
				+        """The exact reproducer from the bug report."""
			
 
				+        with pytest.raises(InvalidFilenameError) as exc_info:
			
 
				+            validate_print_filename("L|R.3mf")
			
 
				+        assert exc_info.value.char == "|"
			
 
				+
			
 
				+    @pytest.mark.parametrize("name", ["", " ", "   "])
			
 
				+    def test_empty_rejected(self, name: str) -> None:
			
 
				+        with pytest.raises(InvalidFilenameError, match="empty"):
			
 
				+            validate_print_filename(name)
			
 
				+
			
 
				+    @pytest.mark.parametrize("name", [".", ".."])
			
 
				+    def test_dot_names_rejected(self, name: str) -> None:
			
 
				+        with pytest.raises(InvalidFilenameError):
			
 
				+            validate_print_filename(name)
			
 
				+
			
 
				+    def test_control_char_rejected(self) -> None:
			
 
				+        with pytest.raises(InvalidFilenameError, match="control"):
			
 
				+            validate_print_filename("file\x01.3mf")
			
 
				+
			
 
				+    @pytest.mark.parametrize("name", ["file.3mf.", "file.3mf "])
			
 
				+    def test_trailing_space_or_dot_rejected(self, name: str) -> None:
			
 
				+        with pytest.raises(InvalidFilenameError, match="space or dot"):
			
 
				+            validate_print_filename(name)
			
 
				+
			
 
				+    def test_too_long_rejected(self) -> None:
			
 
				+        with pytest.raises(InvalidFilenameError, match="bytes"):
			
 
				+            validate_print_filename("a" * 256)
			
 
				+
			
 
				+    def test_unicode_byte_length_not_codepoint(self) -> None:
			
 
				+        """255 multi-byte codepoints exceeds 255 bytes — must reject."""
			
 
				+        # 'ä' is 2 bytes in UTF-8
			
 
				+        with pytest.raises(InvalidFilenameError, match="bytes"):
			
 
				+            validate_print_filename("ä" * 200)
			
 
				+
			
 
				+
			
 
				+class TestDeriveRemoteFilename:
			
 
				+    """SD-card upload-name derivation must match what the cleanup deletes (#1542)."""
			
 
				+
			
 
				+    def test_strips_gcode_3mf(self) -> None:
			
 
				+        assert derive_remote_filename("Cube.gcode.3mf") == "Cube.3mf"
			
 
				+
			
 
				+    def test_strips_3mf(self) -> None:
			
 
				+        assert derive_remote_filename("Cube.3mf") == "Cube.3mf"
			
 
				+
			
 
				+    def test_bare_stem_appends_3mf(self) -> None:
			
 
				+        assert derive_remote_filename("Cube") == "Cube.3mf"
			
 
				+
			
 
				+    def test_replaces_spaces_with_underscores(self) -> None:
			
 
				+        # firmware parses ftp://{filename} as a URL, spaces break it
			
 
				+        assert derive_remote_filename("Cube (1).gcode.3mf") == "Cube_(1).3mf"
			
 
				+
			
 
				+    def test_doubled_gcode_3mf_fully_stripped(self) -> None:
			
 
				+        # The literal reproducer from #1542: library row had .gcode.3mf appended twice
			
 
				+        assert derive_remote_filename("Cube (1).gcode.3mf.gcode.3mf") == "Cube_(1).3mf"
			
 
				+
			
 
				+    def test_doubled_3mf_fully_stripped(self) -> None:
			
 
				+        assert derive_remote_filename("Cube.3mf.3mf") == "Cube.3mf"
			
 
				+
			
 
				+    def test_mixed_double_extensions_fully_stripped(self) -> None:
			
 
				+        assert derive_remote_filename("Cube.gcode.3mf.3mf") == "Cube.3mf"
			
 
				+
			
 
				+    def test_raw_gcode_unchanged_stem(self) -> None:
			
 
				+        # Bare .gcode (no .3mf wrapper) is a valid sliced file — only the
			
 
				+        # .3mf wrapper gets stripped; .gcode survives and the result is
			
 
				+        # the printer's expected ftp:// target.
			
 
				+        assert derive_remote_filename("Cube.gcode") == "Cube.gcode.3mf"
			
 
				+
			
 
				+    def test_idempotent(self) -> None:
			
 
				+        once = derive_remote_filename("Cube (1).gcode.3mf.gcode.3mf")
			
 
				+        assert derive_remote_filename(once) == once
			
 
				+
			
 
				+    def test_unicode_stem_preserved(self) -> None:
			
 
				+        assert derive_remote_filename("プリント.gcode.3mf") == "プリント.3mf"
			
 
				+
			
 
				+    def test_non_string_input_raises_typeerror(self) -> None:
			
 
				+        """A duck-typed object whose endswith always returns truthy must not be
			
 
				+        allowed to enter the strip loop — that's how a test mock OOM'd the
			
 
				+        container at 61 GB before the type guard was added."""
			
 
				+        from unittest.mock import MagicMock
			
 
				+
			
 
				+        with pytest.raises(TypeError, match="requires str"):
			
 
				+            derive_remote_filename(MagicMock())
			
 
				+        with pytest.raises(TypeError, match="requires str"):
			
 
				+            derive_remote_filename(None)  # type: ignore[arg-type]
			
 
				+        with pytest.raises(TypeError, match="requires str"):
			
 
				+            derive_remote_filename(123)  # type: ignore[arg-type]
			
--- a/backend/tests/unit/test_library_classify_file_type.py
+++ b/backend/tests/unit/test_library_classify_file_type.py
@@ -0,0 +1,56 @@
 
				+"""Regression tests for the unified file_type classifier (#1600).
			
 
				+
			
 
				+Pre-#1600 each ingest path classified `LibraryFile.file_type` differently
			
 
				+for the same on-disk file family — only the external-folder scan stored
			
 
				+`gcode.3mf` for sliced outputs, while upload / ZIP-extract / in-process
			
 
				+all stripped to the trailing extension and stored `3mf`. The frontend
			
 
				+had to accept both per #1543, the gcode-download endpoint only handled
			
 
				+`3mf`, and the external-scan thumbnail gate skipped `gcode.3mf` entirely
			
 
				+(#1600 itself). `classify_file_type` is now the single source of truth
			
 
				+across every ingest path + a one-shot DB migration backfills legacy rows.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.api.routes.library import classify_file_type
			
 
				+
			
 
				+
			
 
				+@pytest.mark.parametrize(
			
 
				+    "filename, expected",
			
 
				+    [
			
 
				+        # Sliced output — compound extension preserved
			
 
				+        ("model.gcode.3mf", "gcode.3mf"),
			
 
				+        ("Multi.Plate.gcode.3mf", "gcode.3mf"),
			
 
				+        ("MIXED_CASE.GCODE.3MF", "gcode.3mf"),
			
 
				+        # Plain 3MF — unchanged
			
 
				+        ("model.3mf", "3mf"),
			
 
				+        ("model.3MF", "3mf"),
			
 
				+        # Raw gcode — not a sliced-3mf, classified as gcode (matches existing
			
 
				+        # gcode-thumbnail branch and the gcode-download endpoint).
			
 
				+        ("model.gcode", "gcode"),
			
 
				+        ("model.GCODE", "gcode"),
			
 
				+        # STL — used by the stats query, thumbnail backfill, and the
			
 
				+        # `file_type == "stl"` filter. Must not change.
			
 
				+        ("model.stl", "stl"),
			
 
				+        # Common image extensions used for thumbnails
			
 
				+        ("preview.png", "png"),
			
 
				+        ("preview.JPG", "jpg"),
			
 
				+        # Files without an extension classify as `unknown` so the downstream
			
 
				+        # `unknown` branches still see them.
			
 
				+        ("README", "unknown"),
			
 
				+        # Files that LOOK like sliced output but aren't — confidence guard.
			
 
				+        ("not.gcode.3mf.bak", "bak"),
			
 
				+    ],
			
 
				+)
			
 
				+def test_classify_file_type_returns_canonical_value(filename, expected):
			
 
				+    assert classify_file_type(filename) == expected
			
 
				+
			
 
				+
			
 
				+def test_gcode_3mf_classification_is_stable_across_extension_casing():
			
 
				+    """The migration's `LOWER(filename) LIKE '%.gcode.3mf'` predicate matches
			
 
				+    every casing the classifier accepts, so unify on a single canonical
			
 
				+    lowercase value."""
			
 
				+    for variant in ("foo.gcode.3mf", "foo.Gcode.3mf", "foo.gcode.3MF", "FOO.GCODE.3MF"):
			
 
				+        assert classify_file_type(variant) == "gcode.3mf"
			
--- a/backend/tests/unit/test_library_file_type_backfill_migration.py
+++ b/backend/tests/unit/test_library_file_type_backfill_migration.py
@@ -0,0 +1,160 @@
 
				+"""Regression test for the library_files.file_type backfill migration (#1600).
			
 
				+
			
 
				+Pre-#1600 the upload, ZIP-extract, and in-process ingest paths all stored
			
 
				+`file_type='3mf'` for sliced `.gcode.3mf` outputs while the external-folder
			
 
				+scan stored `file_type='gcode.3mf'` — the same on-disk file family split
			
 
				+across two values depending on how it was ingested. `classify_file_type`
			
 
				+is now canonical going forward; this migration backfills the legacy `3mf`
			
 
				+rows so the DB ends up consistent. Idempotent and dialect-neutral.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import pytest
			
 
				+from sqlalchemy import text
			
 
				+from sqlalchemy.ext.asyncio import create_async_engine
			
 
				+
			
 
				+from backend.app.core.database import run_migrations
			
 
				+
			
 
				+
			
 
				+@pytest.fixture(autouse=True)
			
 
				+def force_sqlite_dialect(monkeypatch):
			
 
				+    """Force the SQLite branch regardless of test env settings."""
			
 
				+    from backend.app.core import db_dialect
			
 
				+
			
 
				+    monkeypatch.setattr(db_dialect, "is_sqlite", lambda: True)
			
 
				+    monkeypatch.setattr(db_dialect, "is_postgres", lambda: False)
			
 
				+    from backend.app.core import database as database_module
			
 
				+
			
 
				+    monkeypatch.setattr(database_module, "is_sqlite", lambda: True)
			
 
				+
			
 
				+
			
 
				+def _register_all_models():
			
 
				+    from backend.app.models import (  # noqa: F401
			
 
				+        ams_history,
			
 
				+        ams_label,
			
 
				+        api_key,
			
 
				+        archive,
			
 
				+        color_catalog,
			
 
				+        external_link,
			
 
				+        filament,
			
 
				+        group,
			
 
				+        kprofile_note,
			
 
				+        library,
			
 
				+        maintenance,
			
 
				+        notification,
			
 
				+        notification_template,
			
 
				+        print_log,
			
 
				+        print_queue,
			
 
				+        printer,
			
 
				+        project,
			
 
				+        project_bom,
			
 
				+        settings,
			
 
				+        slot_preset,
			
 
				+        smart_plug,
			
 
				+        smart_plug_energy_snapshot,
			
 
				+        spool,
			
 
				+        spool_assignment,
			
 
				+        spool_catalog,
			
 
				+        spool_k_profile,
			
 
				+        spool_usage_history,
			
 
				+        spoolbuddy_device,
			
 
				+        user,
			
 
				+        user_email_pref,
			
 
				+        virtual_printer,
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+@pytest.fixture
			
 
				+async def engine():
			
 
				+    from backend.app.core.database import Base
			
 
				+
			
 
				+    _register_all_models()
			
 
				+
			
 
				+    eng = create_async_engine("sqlite+aiosqlite:///:memory:", echo=False)
			
 
				+    async with eng.begin() as conn:
			
 
				+        await conn.run_sync(Base.metadata.create_all)
			
 
				+    yield eng
			
 
				+    await eng.dispose()
			
 
				+
			
 
				+
			
 
				+async def _insert_file(conn, *, file_id: int, filename: str, file_type: str) -> None:
			
 
				+    """Insert a minimal LibraryFile row; only the columns the migration
			
 
				+    touches matter."""
			
 
				+    await conn.execute(
			
 
				+        text(
			
 
				+            "INSERT INTO library_files "
			
 
				+            "(id, filename, file_path, file_type, file_size, is_external, print_count) "
			
 
				+            "VALUES (:id, :filename, :path, :ftype, 0, 0, 0)"
			
 
				+        ),
			
 
				+        {
			
 
				+            "id": file_id,
			
 
				+            "filename": filename,
			
 
				+            "path": f"/lib/{file_id}",
			
 
				+            "ftype": file_type,
			
 
				+        },
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_backfill_flips_only_legacy_gcode_3mf_rows(engine):
			
 
				+    """Rows with `file_type='3mf'` whose filename ends in `.gcode.3mf` get
			
 
				+    upgraded to `gcode.3mf`. Everything else stays put."""
			
 
				+    async with engine.begin() as conn:
			
 
				+        await _insert_file(conn, file_id=1, filename="sliced.gcode.3mf", file_type="3mf")
			
 
				+        await _insert_file(conn, file_id=2, filename="UPPER.GCODE.3MF", file_type="3mf")
			
 
				+        await _insert_file(conn, file_id=3, filename="model.3mf", file_type="3mf")  # not sliced
			
 
				+        await _insert_file(conn, file_id=4, filename="model.gcode", file_type="gcode")
			
 
				+        await _insert_file(conn, file_id=5, filename="model.stl", file_type="stl")
			
 
				+        await _insert_file(conn, file_id=6, filename="already.gcode.3mf", file_type="gcode.3mf")
			
 
				+
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+
			
 
				+    async with engine.connect() as conn:
			
 
				+        rows = dict((await conn.execute(text("SELECT id, file_type FROM library_files ORDER BY id"))).fetchall())
			
 
				+
			
 
				+    assert rows[1] == "gcode.3mf", "lowercase .gcode.3mf must be backfilled"
			
 
				+    assert rows[2] == "gcode.3mf", "uppercase .GCODE.3MF must be backfilled (LOWER(filename) in migration)"
			
 
				+    assert rows[3] == "3mf", "plain .3mf stays at `3mf` — not a sliced output"
			
 
				+    assert rows[4] == "gcode", "raw .gcode is untouched"
			
 
				+    assert rows[5] == "stl", "stl is untouched"
			
 
				+    assert rows[6] == "gcode.3mf", "rows already at canonical pass through"
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_backfill_is_idempotent(engine):
			
 
				+    """Every boot re-runs the migration set; a second pass on already-
			
 
				+    backfilled rows must be a no-op."""
			
 
				+    async with engine.begin() as conn:
			
 
				+        await _insert_file(conn, file_id=1, filename="sliced.gcode.3mf", file_type="3mf")
			
 
				+
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+
			
 
				+    async with engine.connect() as conn:
			
 
				+        result = await conn.execute(text("SELECT file_type FROM library_files WHERE id = 1"))
			
 
				+        assert result.scalar() == "gcode.3mf"
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_backfill_leaves_unrelated_3mf_rows_alone(engine):
			
 
				+    """A row whose filename happens to contain `.gcode.3mf` as a substring
			
 
				+    but doesn't END with it (e.g. a `.bak` of a sliced output) is not a
			
 
				+    sliced output — must NOT be backfilled."""
			
 
				+    async with engine.begin() as conn:
			
 
				+        await _insert_file(conn, file_id=1, filename="sliced.gcode.3mf.bak", file_type="3mf")
			
 
				+
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+
			
 
				+    async with engine.connect() as conn:
			
 
				+        result = await conn.execute(text("SELECT file_type FROM library_files WHERE id = 1"))
			
 
				+        # The LIKE predicate uses '%.gcode.3mf' so a trailing .bak doesn't match.
			
 
				+        # The row keeps its pre-migration `3mf` — odd, but classify_file_type
			
 
				+        # returns `bak` for a fresh ingest, so this row simply stays where it
			
 
				+        # was. The migration's job is to fix the dominant class, not chase
			
 
				+        # every edge case.
			
 
				+        assert result.scalar() == "3mf"
			
--- a/backend/tests/unit/test_no_fail_open_in_auth.py
+++ b/backend/tests/unit/test_no_fail_open_in_auth.py
@@ -0,0 +1,115 @@
 
				+"""GHSA-6mf4-q26m-47pv backstop: no fail-open ``except Exception`` in auth code.
			
 
				+
			
 
				+The advisory's root cause was a single ``except Exception:`` block in the
			
 
				+auth probe path that returned ``False`` (treated as "auth disabled, allow
			
 
				+everything") when the DB raised an error during the check. CVSS 9.8.
			
 
				+Other Python ecosystems would call this CWE-636 ("Not Failing
			
 
				+Securely").
			
 
				+
			
 
				+The fundamental problem is that ``except Exception:`` is too broad to
			
 
				+audit at review time — the reviewer cannot tell, just from the except
			
 
				+clause, whether the handler re-raises, denies, or silently returns a
			
 
				+permissive value. So every such block in auth-sensitive code must be
			
 
				+explicitly tagged with the reviewer's audit conclusion using the
			
 
				+``# SEC-AUTH-EXC: <reason>`` marker. Untagged blocks fail this
			
 
				+test.
			
 
				+
			
 
				+The tag forces three things every time an ``except Exception:`` lands
			
 
				+in scope:
			
 
				+1. A reviewer has read the handler body and confirmed fail-closed semantics.
			
 
				+2. The reasoning is captured at the exact line so future readers can verify.
			
 
				+3. ``grep SEC-AUTH-EXC`` enumerates every audited exception path for spot-checks.
			
 
				+
			
 
				+Scope (where this rule applies, mirrors SECURITY.md rule 2):
			
 
				+- backend/app/core/auth.py
			
 
				+- backend/app/core/permissions.py
			
 
				+- backend/app/api/routes/auth.py
			
 
				+
			
 
				+To add a new ``except Exception:`` block in scope, append a comment
			
 
				+``# SEC-AUTH-EXC: <short reason>`` on the same line as the
			
 
				+``except`` keyword. The reason should describe what makes the handler
			
 
				+safe (e.g. "rollback + raise 500", "returns None which caller treats
			
 
				+as invalid → 401", "logged only, no access decision made here").
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import ast
			
 
				+from pathlib import Path
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+REPO_ROOT = Path(__file__).resolve().parents[3]
			
 
				+
			
 
				+# Files in scope for the lint. Adding a file here widens the safety net;
			
 
				+# removing one weakens it. Either decision belongs in a PR description.
			
 
				+IN_SCOPE: tuple[Path, ...] = (
			
 
				+    REPO_ROOT / "backend" / "app" / "core" / "auth.py",
			
 
				+    REPO_ROOT / "backend" / "app" / "core" / "permissions.py",
			
 
				+    REPO_ROOT / "backend" / "app" / "api" / "routes" / "auth.py",
			
 
				+)
			
 
				+
			
 
				+TAG_MARKER = "# SEC-AUTH-EXC:"
			
 
				+
			
 
				+
			
 
				+def _is_broad_except(handler: ast.ExceptHandler) -> bool:
			
 
				+    """Return True if ``handler`` catches Exception or bare ``except:``.
			
 
				+
			
 
				+    Excludes narrower catches like ``except (OperationalError, ProgrammingError):``
			
 
				+    or ``except JWTError:`` which are explicit about what they handle and
			
 
				+    not the GHSA-6mf4 shape.
			
 
				+    """
			
 
				+    if handler.type is None:
			
 
				+        return True  # bare `except:`
			
 
				+    # Single Name catching Exception
			
 
				+    if isinstance(handler.type, ast.Name) and handler.type.id == "Exception":
			
 
				+        return True
			
 
				+    # Tuple catching Exception alongside other types — e.g. `except (Exception, OSError):`
			
 
				+    if isinstance(handler.type, ast.Tuple):
			
 
				+        return any(isinstance(elt, ast.Name) and elt.id == "Exception" for elt in handler.type.elts)
			
 
				+    return False
			
 
				+
			
 
				+
			
 
				+@pytest.mark.unit
			
 
				+def test_no_fail_open_in_auth_modules() -> None:
			
 
				+    """SEC-AUTH-2 (SECURITY.md): every broad except in auth modules must carry SEC-AUTH-EXC tag.
			
 
				+
			
 
				+    Walks the AST of each in-scope module, finds every ``except Exception:``
			
 
				+    (or bare ``except:``) block, and asserts the source line containing
			
 
				+    the ``except`` keyword has a ``# SEC-AUTH-EXC: <reason>`` tag.
			
 
				+
			
 
				+    The tag is the reviewer's signed-off audit conclusion. Without it,
			
 
				+    the broad except is indistinguishable from the GHSA-6mf4 shape.
			
 
				+    """
			
 
				+    findings: list[str] = []
			
 
				+    for source_path in IN_SCOPE:
			
 
				+        assert source_path.is_file(), f"Expected in-scope file at {source_path}"
			
 
				+        source = source_path.read_text(encoding="utf-8")
			
 
				+        source_lines = source.splitlines()
			
 
				+        tree = ast.parse(source)
			
 
				+        relative = source_path.relative_to(REPO_ROOT)
			
 
				+
			
 
				+        for node in ast.walk(tree):
			
 
				+            if not isinstance(node, ast.ExceptHandler):
			
 
				+                continue
			
 
				+            if not _is_broad_except(node):
			
 
				+                continue
			
 
				+
			
 
				+            # The ``except`` keyword is on node.lineno. Comment must appear
			
 
				+            # on that line (1-indexed in ast, 0-indexed in our list).
			
 
				+            line_text = source_lines[node.lineno - 1]
			
 
				+            if TAG_MARKER not in line_text:
			
 
				+                # Show enough context for the operator to find the block.
			
 
				+                handler_preview = line_text.strip()
			
 
				+                findings.append(
			
 
				+                    f"  {relative}:{node.lineno}  {handler_preview}\n"
			
 
				+                    f"      → add `{TAG_MARKER} <reason>` describing why this is fail-closed"
			
 
				+                )
			
 
				+
			
 
				+    assert not findings, (
			
 
				+        "Untagged ``except Exception:`` (or bare ``except:``) blocks found in auth modules. "
			
 
				+        "Each one is indistinguishable at review time from the GHSA-6mf4-q26m-47pv shape (CVSS 9.8). "
			
 
				+        "Either narrow the catch to the specific exception type you handle, or tag the line with "
			
 
				+        "`# SEC-AUTH-EXC: <reason>` documenting what makes the handler fail-closed. "
			
 
				+        "See SECURITY.md rule 2 'Fail-closed in auth code'.\n\n" + "\n".join(findings)
			
 
				+    )
			
--- a/backend/tests/unit/test_no_hardcoded_secrets.py
+++ b/backend/tests/unit/test_no_hardcoded_secrets.py
@@ -0,0 +1,158 @@
 
				+"""GHSA-gc24-px2r-5qmf backstop: no hardcoded fallback secrets in source.
			
 
				+
			
 
				+The first half of GHSA-gc24-px2r-5qmf (CVSS 9.8) was a literal
			
 
				+``bambuddy-secret-key-change-in-production`` string used as the JWT
			
 
				+signing key when ``JWT_SECRET_KEY`` was unset. Production Docker images
			
 
				+shipped with that exact string — meaning anyone who pulled the image
			
 
				+could forge admin tokens for any Bambuddy instance running unmodified.
			
 
				+
			
 
				+This test walks every source file in ``backend/app/`` at parse time and
			
 
				+flags string literals that look like credential fallbacks. It is
			
 
				+deliberately stricter than the actual exploit: any
			
 
				+``*-change-in-production`` / ``change-me`` / ``your-secret-here``
			
 
				+shaped string is a code smell at a security boundary, regardless of
			
 
				+whether the call site happens to enforce env-var presence today. The
			
 
				+goal is to keep that string class out of the codebase entirely so
			
 
				+future code paths cannot re-introduce the same vulnerability shape.
			
 
				+
			
 
				+If you need one of these strings as a test input (e.g. asserting that
			
 
				+a forged token signed with the old leaked secret is *rejected*), use
			
 
				+the ``ALLOWED_TEST_INPUT_PATTERNS`` allowlist below — never the
			
 
				+production source.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import ast
			
 
				+from pathlib import Path
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+# Substring patterns that should never appear in production source as
			
 
				+# string literals. Case-insensitive substring match.
			
 
				+FORBIDDEN_PATTERNS: tuple[str, ...] = (
			
 
				+    "change-in-production",
			
 
				+    "change-me-in-production",
			
 
				+    "your-secret-here",
			
 
				+    "your-secret-key",
			
 
				+    "default-secret-key",
			
 
				+    "insecure-default",
			
 
				+    "placeholder-secret",
			
 
				+    "replace-this-secret",
			
 
				+    # The exact leaked value from GHSA-gc24 — keep as a regression marker
			
 
				+    # so any reintroduction is caught loudly with the CVE number attached.
			
 
				+    "bambuddy-secret-key-change-in-production",
			
 
				+)
			
 
				+
			
 
				+# Production-source files where these patterns are TOLERATED because they
			
 
				+# document the historical leak (CHANGELOG / migration notes / security
			
 
				+# advisory references) rather than being used as a credential fallback.
			
 
				+# Add an entry with a `# reason: ...` comment, never silently.
			
 
				+ALLOWED_PRODUCTION_FILES: frozenset[Path] = frozenset()
			
 
				+
			
 
				+
			
 
				+def _python_files_under(root: Path) -> list[Path]:
			
 
				+    """Yield every .py file under ``root`` excluding caches and virtualenvs."""
			
 
				+    return [
			
 
				+        p
			
 
				+        for p in root.rglob("*.py")
			
 
				+        if "__pycache__" not in p.parts and ".venv" not in p.parts and "venv" not in p.parts
			
 
				+    ]
			
 
				+
			
 
				+
			
 
				+def _string_literals_in(file_path: Path) -> list[tuple[int, str]]:
			
 
				+    """Return (lineno, value) for every string literal in ``file_path``.
			
 
				+
			
 
				+    Uses ``ast`` to avoid false positives from comments / docstrings;
			
 
				+    docstrings are ``ast.Constant`` too but we explicitly include them
			
 
				+    because a docstring is not a safe place to put a credential either.
			
 
				+    Returns an empty list on syntax-error files rather than crashing —
			
 
				+    a parse failure means the file has a separate bug and we don't want
			
 
				+    this test to mask it.
			
 
				+    """
			
 
				+    try:
			
 
				+        tree = ast.parse(file_path.read_text(encoding="utf-8"))
			
 
				+    except (SyntaxError, UnicodeDecodeError):
			
 
				+        return []
			
 
				+    return [
			
 
				+        (node.lineno, node.value)
			
 
				+        for node in ast.walk(tree)
			
 
				+        if isinstance(node, ast.Constant) and isinstance(node.value, str)
			
 
				+    ]
			
 
				+
			
 
				+
			
 
				+@pytest.mark.unit
			
 
				+def test_no_hardcoded_secrets_in_production_source() -> None:
			
 
				+    """SEC-AUTH-3 (SECURITY.md): no credential-shaped fallback strings in backend/app/.
			
 
				+
			
 
				+    Walks every Python source file under ``backend/app/``. Flags string
			
 
				+    literals matching any pattern in ``FORBIDDEN_PATTERNS``. Allowlisted
			
 
				+    files (e.g. tests asserting we reject the leaked GHSA-gc24 token)
			
 
				+    are exempt via ``ALLOWED_PRODUCTION_FILES``.
			
 
				+
			
 
				+    Failure here means a code change has reintroduced the GHSA-gc24
			
 
				+    failure mode: a string literal that production code could fall
			
 
				+    back to as a credential, defeating the env-var-or-fail design of
			
 
				+    ``_get_jwt_secret()``.
			
 
				+    """
			
 
				+    repo_root = Path(__file__).resolve().parents[3]
			
 
				+    production_root = repo_root / "backend" / "app"
			
 
				+    assert production_root.is_dir(), f"Expected backend/app/ at {production_root}"
			
 
				+
			
 
				+    findings: list[str] = []
			
 
				+    for src in _python_files_under(production_root):
			
 
				+        relative = src.relative_to(repo_root)
			
 
				+        if relative in ALLOWED_PRODUCTION_FILES:
			
 
				+            continue
			
 
				+        for lineno, literal in _string_literals_in(src):
			
 
				+            literal_lower = literal.lower()
			
 
				+            for pattern in FORBIDDEN_PATTERNS:
			
 
				+                if pattern in literal_lower:
			
 
				+                    findings.append(f"  {relative}:{lineno} contains forbidden pattern '{pattern}': {literal!r}")
			
 
				+                    break
			
 
				+
			
 
				+    assert not findings, (
			
 
				+        "Hardcoded credential-shaped strings found in production source — "
			
 
				+        "this is the GHSA-gc24-px2r-5qmf shape (CVSS 9.8 hardcoded JWT secret). "
			
 
				+        "See SECURITY.md rule 3 'No hardcoded fallback secrets'.\n\n" + "\n".join(findings)
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+@pytest.mark.unit
			
 
				+def test_jwt_secret_loader_has_no_hardcoded_fallback() -> None:
			
 
				+    """SEC-AUTH-3 (SECURITY.md): _get_jwt_secret never returns a literal string.
			
 
				+
			
 
				+    The post-GHSA-gc24 design of ``_get_jwt_secret`` reads from env, then
			
 
				+    file, then generates a random value via ``secrets.token_urlsafe``.
			
 
				+    No code path returns a string literal. This test asserts that
			
 
				+    structural property by walking the function's AST and confirming
			
 
				+    every ``return`` statement returns either a Name (variable) or a
			
 
				+    Call (function result), never an ast.Constant string literal.
			
 
				+
			
 
				+    If this test fails, ``_get_jwt_secret`` has been modified to return
			
 
				+    a hardcoded value somewhere — likely as a "convenience default" that
			
 
				+    will end up in a shipped Docker image, which is exactly how the
			
 
				+    original GHSA-gc24 advisory happened.
			
 
				+    """
			
 
				+    repo_root = Path(__file__).resolve().parents[3]
			
 
				+    auth_module = repo_root / "backend" / "app" / "core" / "auth.py"
			
 
				+    tree = ast.parse(auth_module.read_text(encoding="utf-8"))
			
 
				+
			
 
				+    loader: ast.FunctionDef | None = None
			
 
				+    for node in ast.walk(tree):
			
 
				+        if isinstance(node, ast.FunctionDef) and node.name == "_get_jwt_secret":
			
 
				+            loader = node
			
 
				+            break
			
 
				+
			
 
				+    assert loader is not None, "_get_jwt_secret() not found in backend/app/core/auth.py — has it been renamed?"
			
 
				+
			
 
				+    literal_returns: list[tuple[int, str]] = []
			
 
				+    for node in ast.walk(loader):
			
 
				+        if isinstance(node, ast.Return) and isinstance(node.value, ast.Constant) and isinstance(node.value.value, str):
			
 
				+            literal_returns.append((node.lineno, node.value.value))
			
 
				+
			
 
				+    assert not literal_returns, (
			
 
				+        "_get_jwt_secret() has a string-literal return — this is the GHSA-gc24 vulnerability shape. "
			
 
				+        "Use os.environ + file storage + secrets.token_urlsafe; never return a hardcoded string.\n"
			
 
				+        + "\n".join(f"  auth.py:{ln}: returns {val!r}" for ln, val in literal_returns)
			
 
				+    )
			
--- a/backend/tests/unit/test_no_unsafe_path_joins.py
+++ b/backend/tests/unit/test_no_unsafe_path_joins.py
@@ -0,0 +1,304 @@
 
				+"""Backstop: every Path-arithmetic site in the API routes that joins a
			
 
				+variable to a directory-like parent must either use ``safe_join_under`` or
			
 
				+carry a ``# SEC-PATH-OK: <reason>`` marker.
			
 
				+
			
 
				+A critical advisory traced to plain ``Path / user_string`` arithmetic in
			
 
				+``import_project_file`` — the join had no resolve + containment check, and an
			
 
				+attacker-supplied absolute path collapsed the left side. This test catches the
			
 
				+same shape in any new route added later: it AST-walks every Python file under
			
 
				+``backend/app/api/routes/`` and flags every ``a / b`` where ``a`` looks like a
			
 
				+directory variable and ``b`` is a non-constant (i.e. variable / call result).
			
 
				+
			
 
				+False positives are intentionally cheap to silence (add a one-line
			
 
				+``# SEC-PATH-OK: <reason>`` justifying the existing guard) so that *future*
			
 
				+unsafe joins are noisy by default.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import ast
			
 
				+from pathlib import Path
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+# The route surface receives external input directly; the services layer is
			
 
				+# called by the routes and routinely receives values that originated from a
			
 
				+# request (filenames, query params) or from an untrusted external source
			
 
				+# (printer FTP listings — the printer is part of the threat surface in the
			
 
				+# compromised-printer model). Both layers need the strictest gate.
			
 
				+_BACKEND_APP = Path(__file__).resolve().parents[2] / "app"
			
 
				+SCAN_DIRS = [
			
 
				+    _BACKEND_APP / "api" / "routes",
			
 
				+    _BACKEND_APP / "services",
			
 
				+]
			
 
				+
			
 
				+# Identifier substrings that suggest the LHS is a filesystem directory. Heuristic
			
 
				+# but tuned to Bambuddy's conventions — every actual directory variable in the
			
 
				+# routes hits one of these.
			
 
				+_DIR_NAME_HINTS = (
			
 
				+    "_dir",
			
 
				+    "_path",
			
 
				+    "dir_",
			
 
				+    "path_",
			
 
				+    "temp_path",
			
 
				+    "library_dir",
			
 
				+    "archive_dir",
			
 
				+    "photos_dir",
			
 
				+    "base_dir",
			
 
				+    "ext_dir",
			
 
				+    "attachments_dir",
			
 
				+    "static_dir",
			
 
				+    "log_dir",
			
 
				+    "data_dir",
			
 
				+    "folder_path",
			
 
				+    "file_disk_path",
			
 
				+    "photo_path",
			
 
				+    "dest",
			
 
				+    "output_path",
			
 
				+)
			
 
				+
			
 
				+# Function calls whose return value is a Path under our control. Hits to these
			
 
				+# don't need scrutiny — they're constructed by Bambuddy code, not by the request.
			
 
				+_KNOWN_PATH_FACTORIES = (
			
 
				+    "Path",
			
 
				+    "get_library_dir",
			
 
				+    "get_library_files_dir",
			
 
				+    "get_archive_dir",
			
 
				+    "get_project_attachments_dir",
			
 
				+    "get_project_cover_dir",
			
 
				+    "resolve",
			
 
				+)
			
 
				+
			
 
				+_MARKER = "# SEC-PATH-OK:"
			
 
				+
			
 
				+
			
 
				+def _looks_path_like(node: ast.AST) -> bool:
			
 
				+    """Heuristic for whether *node* evaluates to a ``pathlib.Path``."""
			
 
				+    if isinstance(node, ast.Call):
			
 
				+        func = node.func
			
 
				+        if isinstance(func, ast.Name) and func.id in _KNOWN_PATH_FACTORIES:
			
 
				+            return True
			
 
				+        return bool(isinstance(func, ast.Attribute) and func.attr in _KNOWN_PATH_FACTORIES)
			
 
				+    if isinstance(node, ast.Name):
			
 
				+        return any(hint in node.id for hint in _DIR_NAME_HINTS)
			
 
				+    if isinstance(node, ast.Attribute):
			
 
				+        # `settings.base_dir`, `cls.archive_dir`, etc.
			
 
				+        return any(hint in node.attr for hint in _DIR_NAME_HINTS)
			
 
				+    if isinstance(node, ast.BinOp) and isinstance(node.op, ast.Div):
			
 
				+        # Chains like ``base_dir / "x" / variable`` — keep looking left.
			
 
				+        return _looks_path_like(node.left)
			
 
				+    return False
			
 
				+
			
 
				+
			
 
				+def _is_constant_string(node: ast.AST) -> bool:
			
 
				+    return isinstance(node, ast.Constant) and isinstance(node.value, str)
			
 
				+
			
 
				+
			
 
				+def _rhs_is_attacker_shape(node: ast.AST) -> bool:
			
 
				+    """The high-risk shape is ``path / Name`` — RHS is a bare variable that
			
 
				+    came from somewhere outside this scope (a function parameter, request
			
 
				+    body field, ZIP namelist entry).
			
 
				+
			
 
				+    Attribute (``lib_file.file_path``), Subscript (``photos[i]``), Call
			
 
				+    (``str(vp_id)``), and JoinedStr (f-strings) all have *some* structure
			
 
				+    that the audit can reason about — those are caught by the broader audit
			
 
				+    sweep, not the regression backstop. This narrows the noise to the exact
			
 
				+    shape that produced the path-traversal class so the backstop only fires
			
 
				+    when something that *looks* like that bug appears.
			
 
				+    """
			
 
				+    return isinstance(node, ast.Name)
			
 
				+
			
 
				+
			
 
				+_CONTINUATION_TOKENS = (")", "]", "}", ",")
			
 
				+
			
 
				+
			
 
				+def _line_has_marker(source_lines: list[str], lineno: int, end_lineno: int | None) -> bool:
			
 
				+    """Check whether a ``# SEC-PATH-OK:`` marker covers this join.
			
 
				+
			
 
				+    Looks at every line spanned by the BinOp itself, plus one line past
			
 
				+    ``end_lineno`` IF that line begins with a continuation token (``)``,
			
 
				+    ``]``, ``}``, ``,``). The peek captures the project's convention of
			
 
				+    wrapping a BinOp in parens and placing the marker on the closing line:
			
 
				+
			
 
				+        file_path = (
			
 
				+            library_dir / filename
			
 
				+        )  # SEC-PATH-OK: filename validated above
			
 
				+
			
 
				+    The BinOp itself ends on the inner line, but the marker reads more
			
 
				+    naturally on the closing line. Restricting the peek to continuation
			
 
				+    lines prevents giving a free pass to a marker that happens to sit on
			
 
				+    a wholly unrelated follow-on statement.
			
 
				+    """
			
 
				+    start = max(1, lineno)
			
 
				+    end = max(start, end_lineno or lineno)
			
 
				+    for i in range(start, end + 1):
			
 
				+        if i - 1 >= len(source_lines):
			
 
				+            continue
			
 
				+        if _MARKER in source_lines[i - 1]:
			
 
				+            return True
			
 
				+    # Project convention: marker often sits on the closing-paren line, one
			
 
				+    # line past the BinOp's `end_lineno`. Only accept it when the line is a
			
 
				+    # continuation of the wrapping expression.
			
 
				+    if end < len(source_lines):
			
 
				+        trailing = source_lines[end].lstrip()
			
 
				+        if trailing.startswith(_CONTINUATION_TOKENS) and _MARKER in source_lines[end]:
			
 
				+            return True
			
 
				+    return False
			
 
				+
			
 
				+
			
 
				+def _enclosing_call_is_safe_join(stack: list[ast.AST]) -> bool:
			
 
				+    """True if the BinOp is being passed directly into ``safe_join_under(...)``.
			
 
				+
			
 
				+    Tracking parent links keeps the test conservative — a ``base_dir / x``
			
 
				+    expression that's already inside ``safe_join_under(base_dir / x, ...)``
			
 
				+    is fine because the helper does its own containment check. This rarely
			
 
				+    happens in practice but keeps the test from yelling about an idiomatic
			
 
				+    arrangement.
			
 
				+    """
			
 
				+    for ancestor in reversed(stack):
			
 
				+        if isinstance(ancestor, ast.Call):
			
 
				+            func = ancestor.func
			
 
				+            if isinstance(func, ast.Name) and func.id == "safe_join_under":
			
 
				+                return True
			
 
				+            if isinstance(func, ast.Attribute) and func.attr == "safe_join_under":
			
 
				+                return True
			
 
				+    return False
			
 
				+
			
 
				+
			
 
				+def _scan_file(py_file: Path) -> list[str]:
			
 
				+    source = py_file.read_text()
			
 
				+    source_lines = source.splitlines()
			
 
				+    tree = ast.parse(source, filename=str(py_file))
			
 
				+    findings: list[str] = []
			
 
				+
			
 
				+    # Walk with parent stack so we can detect "inside safe_join_under" and
			
 
				+    # skip such nodes.
			
 
				+    stack: list[ast.AST] = []
			
 
				+
			
 
				+    def visit(node: ast.AST) -> None:
			
 
				+        stack.append(node)
			
 
				+        try:
			
 
				+            if (
			
 
				+                isinstance(node, ast.BinOp)
			
 
				+                and isinstance(node.op, ast.Div)
			
 
				+                and _looks_path_like(node.left)
			
 
				+                and _rhs_is_attacker_shape(node.right)
			
 
				+                and not _is_constant_string(node.right)
			
 
				+                and not _enclosing_call_is_safe_join(stack)
			
 
				+                and not _line_has_marker(source_lines, node.lineno, node.end_lineno)
			
 
				+            ):
			
 
				+                line = source_lines[node.lineno - 1].strip() if node.lineno - 1 < len(source_lines) else "<?>"
			
 
				+                findings.append(f"{py_file.name}:{node.lineno}  {line}")
			
 
				+            for child in ast.iter_child_nodes(node):
			
 
				+                visit(child)
			
 
				+        finally:
			
 
				+            stack.pop()
			
 
				+
			
 
				+    visit(tree)
			
 
				+    return findings
			
 
				+
			
 
				+
			
 
				+def _scan_source(source: str, tmp_path: Path) -> list[str]:
			
 
				+    """Drop ``source`` into a temp .py file and run ``_scan_file`` against it.
			
 
				+    Returns the findings list."""
			
 
				+    f = tmp_path / "candidate.py"
			
 
				+    f.write_text(source)
			
 
				+    return _scan_file(f)
			
 
				+
			
 
				+
			
 
				+class TestMarkerDetection:
			
 
				+    """Pins the contract for where a ``# SEC-PATH-OK:`` marker is accepted.
			
 
				+
			
 
				+    Markers must sit either (a) somewhere within the BinOp's own source
			
 
				+    lines, or (b) on the immediately-following line when that line is a
			
 
				+    continuation token (closing paren / bracket / brace / comma). The
			
 
				+    second case is the project's convention of wrapping the BinOp in
			
 
				+    parens and placing the marker on the closing-paren line.
			
 
				+    """
			
 
				+
			
 
				+    def test_marker_on_binop_line_recognised(self, tmp_path):
			
 
				+        source = (
			
 
				+            "from pathlib import Path\nbase_dir = Path('.')\ndef f(x): return base_dir / x  # SEC-PATH-OK: trusted x\n"
			
 
				+        )
			
 
				+        assert _scan_source(source, tmp_path) == []
			
 
				+
			
 
				+    def test_marker_on_closing_paren_line_recognised(self, tmp_path):
			
 
				+        # The exact convention used across api/routes/ and services/: the
			
 
				+        # BinOp lives inside a parenthesised expression and the marker sits
			
 
				+        # on the closing-paren line, one past the BinOp's `end_lineno`.
			
 
				+        source = (
			
 
				+            "from pathlib import Path\n"
			
 
				+            "base_dir = Path('.')\n"
			
 
				+            "def f(x):\n"
			
 
				+            "    return (\n"
			
 
				+            "        base_dir / x\n"
			
 
				+            "    )  # SEC-PATH-OK: trusted x\n"
			
 
				+        )
			
 
				+        assert _scan_source(source, tmp_path) == []
			
 
				+
			
 
				+    def test_unrelated_marker_below_does_not_silence(self, tmp_path):
			
 
				+        # A second join below carries a marker; the first does not. Only
			
 
				+        # the first must be flagged — markers don't cross statement
			
 
				+        # boundaries.
			
 
				+        source = (
			
 
				+            "from pathlib import Path\n"
			
 
				+            "base_dir = Path('.')\n"
			
 
				+            "def f(x, y):\n"
			
 
				+            "    p = base_dir / x\n"
			
 
				+            "    q = base_dir / y  # SEC-PATH-OK: trusted y\n"
			
 
				+        )
			
 
				+        findings = _scan_source(source, tmp_path)
			
 
				+        assert len(findings) == 1
			
 
				+        assert "base_dir / x" in findings[0]
			
 
				+
			
 
				+    def test_marker_on_non_continuation_line_does_not_silence(self, tmp_path):
			
 
				+        # A SEC-PATH-OK comment on the line right after the BinOp counts
			
 
				+        # only when that line is a continuation of the wrapping expression.
			
 
				+        # An unrelated next statement's marker must not free-pass the join.
			
 
				+        source = (
			
 
				+            "from pathlib import Path\n"
			
 
				+            "base_dir = Path('.')\n"
			
 
				+            "def f(x):\n"
			
 
				+            "    a = base_dir / x\n"
			
 
				+            "    b = 1  # SEC-PATH-OK: unrelated, for a different statement\n"
			
 
				+        )
			
 
				+        findings = _scan_source(source, tmp_path)
			
 
				+        assert len(findings) == 1
			
 
				+        assert "base_dir / x" in findings[0]
			
 
				+
			
 
				+    def test_no_marker_anywhere_is_flagged(self, tmp_path):
			
 
				+        # Pin the negative path so a future refactor can't accidentally turn
			
 
				+        # marker detection into "always returns True".
			
 
				+        source = "from pathlib import Path\nbase_dir = Path('.')\ndef f(x): return base_dir / x\n"
			
 
				+        findings = _scan_source(source, tmp_path)
			
 
				+        assert len(findings) == 1
			
 
				+        assert "base_dir / x" in findings[0]
			
 
				+
			
 
				+
			
 
				+def test_route_path_arithmetic_is_safe_joined_or_marked():
			
 
				+    """Every ``<dir-like> / <non-constant>`` join in a route handler must
			
 
				+    either route through ``safe_join_under(...)`` or carry a
			
 
				+    ``# SEC-PATH-OK: <reason>`` marker on one of its source lines.
			
 
				+
			
 
				+    Adding ``# SEC-PATH-OK: <reason>`` is the escape hatch for sites where
			
 
				+    the input has already been validated (e.g. a denylist + membership
			
 
				+    check, a pre-sanitised alphanumeric filter, or an explicit resolve +
			
 
				+    ``relative_to`` containment check inline). The marker MUST explain the
			
 
				+    existing guard — silent suppression defeats the backstop's purpose.
			
 
				+    """
			
 
				+    findings: list[str] = []
			
 
				+    for scan_dir in SCAN_DIRS:
			
 
				+        for py_file in sorted(scan_dir.rglob("*.py")):
			
 
				+            if py_file.name == "__init__.py":
			
 
				+                continue
			
 
				+            findings.extend(_scan_file(py_file))
			
 
				+
			
 
				+    if findings:
			
 
				+        pytest.fail(
			
 
				+            "Found Path-arithmetic sites in api/routes/ or services/ that "
			
 
				+            "join a non-constant value to a directory-like parent without "
			
 
				+            "using safe_join_under() or carrying a # SEC-PATH-OK: marker. "
			
 
				+            "Each site must either be refactored to "
			
 
				+            "safe_join_under(parent, *parts) or tagged with the marker "
			
 
				+            "explaining why the existing guard is sufficient.\n\nFindings:\n" + "\n".join(findings)
			
 
				+        )
			
--- a/backend/tests/unit/test_reconcile_stale_active_prints.py
+++ b/backend/tests/unit/test_reconcile_stale_active_prints.py
@@ -0,0 +1,248 @@
 
				+"""Tests for the connected-edge reconciliation that recovers from missed
			
 
				+PRINT COMPLETE events (#1542 follow-up).
			
 
				+
			
 
				+Background: the PRINT COMPLETE MQTT callback is purely reactive to a single
			
 
				+state transition (RUNNING → IDLE / FINISH / FAILED). When the printer
			
 
				+finishes during an MQTT disconnect window — typical on the A1 line with
			
 
				+unstable MQTT keepalives — Bambuddy never observes the transition. If a
			
 
				+smart plug then cuts power between completion and the next reconnect, the
			
 
				+firmware auto-replays whatever's still on the SD card and produces a ghost
			
 
				+print on next power-up. Reporter (#1542 second case) saw this hit 4 out of
			
 
				+4 of his A1s.
			
 
				+
			
 
				+These tests cover:
			
 
				+  * `_is_active_archive_stale` — the pure decision function for whether an
			
 
				+    archive in `status="printing"` should be reconciled given the printer's
			
 
				+    current state.
			
 
				+  * `reconcile_stale_active_prints` — the orchestrator that queries the DB,
			
 
				+    runs the decision function, and synthesises `on_print_complete` for
			
 
				+    each stale archive.
			
 
				+"""
			
 
				+
			
 
				+from types import SimpleNamespace
			
 
				+from unittest.mock import AsyncMock, MagicMock, patch
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.main import _is_active_archive_stale
			
 
				+
			
 
				+
			
 
				+def _state(state: str, *, subtask_id: str = "", subtask_name: str = "", connected: bool = True) -> SimpleNamespace:
			
 
				+    """Minimal PrinterState stub for the pure decision function."""
			
 
				+    return SimpleNamespace(
			
 
				+        state=state,
			
 
				+        subtask_id=subtask_id,
			
 
				+        subtask_name=subtask_name,
			
 
				+        connected=connected,
			
 
				+        raw_data={},
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+def _archive(
			
 
				+    subtask_id: str | None = "ABC123", filename: str = "ghost.3mf", print_name: str = "ghost"
			
 
				+) -> SimpleNamespace:
			
 
				+    """Minimal PrintArchive stub — only the fields the decision function reads."""
			
 
				+    return SimpleNamespace(
			
 
				+        id=42,
			
 
				+        subtask_id=subtask_id,
			
 
				+        filename=filename,
			
 
				+        print_name=print_name,
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+class TestIsActiveArchiveStale:
			
 
				+    """Decision function — covers all three stale triggers + the
			
 
				+    intentionally-conservative no-op cases."""
			
 
				+
			
 
				+    # Trigger 1: printer is in a terminal state.
			
 
				+    @pytest.mark.parametrize("terminal_state", ["IDLE", "FINISH", "FAILED", "idle", "finish", "failed"])
			
 
				+    def test_terminal_state_marks_stale(self, terminal_state):
			
 
				+        archive = _archive(subtask_id="ABC123")
			
 
				+        state = _state(terminal_state, subtask_id="ABC123", subtask_name="ghost")
			
 
				+        is_stale, reason = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is True
			
 
				+        assert terminal_state.upper() in reason
			
 
				+
			
 
				+    # Trigger 2: printer is running a different subtask_id.
			
 
				+    def test_subtask_id_changed_marks_stale(self):
			
 
				+        archive = _archive(subtask_id="OLD_ID")
			
 
				+        state = _state("RUNNING", subtask_id="NEW_ID", subtask_name="something")
			
 
				+        is_stale, reason = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is True
			
 
				+        assert "subtask_id" in reason
			
 
				+        assert "OLD_ID" in reason
			
 
				+        assert "NEW_ID" in reason
			
 
				+
			
 
				+    # Trigger 3: printer is running but doesn't know what it's running.
			
 
				+    def test_empty_subtask_name_marks_stale(self):
			
 
				+        archive = _archive(subtask_id="ABC123")
			
 
				+        state = _state("RUNNING", subtask_id="", subtask_name="")
			
 
				+        is_stale, reason = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is True
			
 
				+        assert "empty" in reason.lower() or "subtask_name" in reason
			
 
				+
			
 
				+    # Healthy case: same subtask_id, running.
			
 
				+    def test_matching_running_print_not_stale(self):
			
 
				+        archive = _archive(subtask_id="ABC123")
			
 
				+        state = _state("RUNNING", subtask_id="ABC123", subtask_name="ghost")
			
 
				+        is_stale, _ = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is False
			
 
				+
			
 
				+    # PAUSE is not a stale signal — the print is paused, not ended.
			
 
				+    def test_paused_print_with_matching_subtask_not_stale(self):
			
 
				+        archive = _archive(subtask_id="ABC123")
			
 
				+        state = _state("PAUSE", subtask_id="ABC123", subtask_name="ghost")
			
 
				+        is_stale, _ = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is False
			
 
				+
			
 
				+    # PREPARE / SLICING are not stale either — pre-print phases.
			
 
				+    @pytest.mark.parametrize("pre_running_state", ["PREPARE", "SLICING"])
			
 
				+    def test_pre_running_states_with_matching_subtask_not_stale(self, pre_running_state):
			
 
				+        archive = _archive(subtask_id="ABC123")
			
 
				+        state = _state(pre_running_state, subtask_id="ABC123", subtask_name="ghost")
			
 
				+        is_stale, _ = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is False
			
 
				+
			
 
				+    # Missing subtask_id on the archive side: don't have evidence either
			
 
				+    # way, fall through to the empty-subtask_name check.
			
 
				+    def test_archive_with_no_subtask_id_falls_to_subtask_name_check(self):
			
 
				+        archive = _archive(subtask_id=None)
			
 
				+        state = _state("RUNNING", subtask_id="ANYTHING", subtask_name="something")
			
 
				+        # Subtask_name is populated → not stale, no false positive.
			
 
				+        is_stale, _ = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is False
			
 
				+
			
 
				+    # Missing subtask_id on both sides: still triggers the empty-subtask_name
			
 
				+    # branch if the printer doesn't know what it's running.
			
 
				+    def test_both_subtask_ids_missing_running_with_empty_name_stale(self):
			
 
				+        archive = _archive(subtask_id=None)
			
 
				+        state = _state("RUNNING", subtask_id="", subtask_name="")
			
 
				+        is_stale, _ = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is True
			
 
				+
			
 
				+    # IDLE wins over PRINT-STATE checks — the terminal-state branch fires
			
 
				+    # first regardless of what the subtask fields look like.
			
 
				+    def test_idle_state_overrides_matching_subtask(self):
			
 
				+        archive = _archive(subtask_id="ABC123")
			
 
				+        state = _state("IDLE", subtask_id="ABC123", subtask_name="ghost")
			
 
				+        is_stale, reason = _is_active_archive_stale(archive, state)
			
 
				+        assert is_stale is True
			
 
				+        assert "IDLE" in reason
			
 
				+
			
 
				+
			
 
				+class TestReconcileStaleActivePrints:
			
 
				+    """Orchestrator-level tests — mock the printer manager + DB session so
			
 
				+    we can drive the decision flow end-to-end without standing up real
			
 
				+    fixtures.
			
 
				+
			
 
				+    These cover:
			
 
				+      * No printer status (disconnected) → no-op, no on_print_complete fired.
			
 
				+      * No active archives → no-op.
			
 
				+      * Stale archive → synthesised on_print_complete called with status
			
 
				+        ``"aborted"`` and the `_reconciled: True` marker so downstream code
			
 
				+        can distinguish synthetic from real completions.
			
 
				+      * Non-stale archive → on_print_complete NOT called (no false positive
			
 
				+        on a healthy in-flight print).
			
 
				+      * Exception inside on_print_complete must NOT block reconciliation
			
 
				+        for subsequent archives or crash the caller.
			
 
				+    """
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_no_status_skips_reconciliation(self):
			
 
				+        from backend.app.main import reconcile_stale_active_prints
			
 
				+
			
 
				+        with patch("backend.app.main.printer_manager") as mock_pm:
			
 
				+            mock_pm.get_status.return_value = None
			
 
				+            count = await reconcile_stale_active_prints(printer_id=1)
			
 
				+        assert count == 0
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_disconnected_status_skips_reconciliation(self):
			
 
				+        from backend.app.main import reconcile_stale_active_prints
			
 
				+
			
 
				+        with patch("backend.app.main.printer_manager") as mock_pm:
			
 
				+            mock_pm.get_status.return_value = _state("RUNNING", connected=False)
			
 
				+            count = await reconcile_stale_active_prints(printer_id=1)
			
 
				+        # Disconnected state would be making decisions against cached state —
			
 
				+        # the connected-edge handler in on_printer_status_change is the only
			
 
				+        # place that should drive reconciliation.
			
 
				+        assert count == 0
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_no_active_archives_returns_zero(self):
			
 
				+        from backend.app.main import reconcile_stale_active_prints
			
 
				+
			
 
				+        with patch("backend.app.main.printer_manager") as mock_pm:
			
 
				+            mock_pm.get_status.return_value = _state("IDLE")
			
 
				+            with patch("backend.app.main.async_session") as mock_session:
			
 
				+                session_ctx = AsyncMock()
			
 
				+                session_ctx.execute = AsyncMock(return_value=MagicMock(scalars=lambda: MagicMock(all=lambda: [])))
			
 
				+                mock_session.return_value.__aenter__.return_value = session_ctx
			
 
				+                count = await reconcile_stale_active_prints(printer_id=1)
			
 
				+        assert count == 0
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_stale_archive_synthesises_aborted_completion(self):
			
 
				+        from backend.app.main import reconcile_stale_active_prints
			
 
				+
			
 
				+        stale = _archive(subtask_id="OLD_ID", filename="ghost.3mf", print_name="ghost")
			
 
				+        with patch("backend.app.main.printer_manager") as mock_pm:
			
 
				+            mock_pm.get_status.return_value = _state("IDLE", subtask_id="", subtask_name="")
			
 
				+            with patch("backend.app.main.async_session") as mock_session:
			
 
				+                session_ctx = AsyncMock()
			
 
				+                session_ctx.execute = AsyncMock(return_value=MagicMock(scalars=lambda: MagicMock(all=lambda: [stale])))
			
 
				+                mock_session.return_value.__aenter__.return_value = session_ctx
			
 
				+                with patch("backend.app.main.on_print_complete", new=AsyncMock()) as mock_complete:
			
 
				+                    count = await reconcile_stale_active_prints(printer_id=1)
			
 
				+        assert count == 1
			
 
				+        mock_complete.assert_awaited_once()
			
 
				+        # Verify the synthesised payload shape.
			
 
				+        args, kwargs = mock_complete.call_args
			
 
				+        assert args[0] == 1
			
 
				+        payload = args[1]
			
 
				+        assert payload["status"] == "aborted"
			
 
				+        assert payload["filename"] == "ghost.3mf"
			
 
				+        assert payload["_reconciled"] is True
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_non_stale_archive_does_not_synthesise(self):
			
 
				+        from backend.app.main import reconcile_stale_active_prints
			
 
				+
			
 
				+        healthy = _archive(subtask_id="ABC123")
			
 
				+        with patch("backend.app.main.printer_manager") as mock_pm:
			
 
				+            mock_pm.get_status.return_value = _state("RUNNING", subtask_id="ABC123", subtask_name="ghost")
			
 
				+            with patch("backend.app.main.async_session") as mock_session:
			
 
				+                session_ctx = AsyncMock()
			
 
				+                session_ctx.execute = AsyncMock(
			
 
				+                    return_value=MagicMock(scalars=lambda: MagicMock(all=lambda: [healthy]))
			
 
				+                )
			
 
				+                mock_session.return_value.__aenter__.return_value = session_ctx
			
 
				+                with patch("backend.app.main.on_print_complete", new=AsyncMock()) as mock_complete:
			
 
				+                    count = await reconcile_stale_active_prints(printer_id=1)
			
 
				+        assert count == 0
			
 
				+        mock_complete.assert_not_called()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_on_print_complete_failure_does_not_block_rest(self):
			
 
				+        """An exception during one archive's synthesis must not abort
			
 
				+        reconciliation for the other archives — and must not propagate to
			
 
				+        the caller (the connected-edge handler is a hot path)."""
			
 
				+        from backend.app.main import reconcile_stale_active_prints
			
 
				+
			
 
				+        a1 = _archive(subtask_id="A", filename="a.3mf")
			
 
				+        a1.id = 1
			
 
				+        a2 = _archive(subtask_id="B", filename="b.3mf")
			
 
				+        a2.id = 2
			
 
				+        with patch("backend.app.main.printer_manager") as mock_pm:
			
 
				+            mock_pm.get_status.return_value = _state("IDLE")
			
 
				+            with patch("backend.app.main.async_session") as mock_session:
			
 
				+                session_ctx = AsyncMock()
			
 
				+                session_ctx.execute = AsyncMock(return_value=MagicMock(scalars=lambda: MagicMock(all=lambda: [a1, a2])))
			
 
				+                mock_session.return_value.__aenter__.return_value = session_ctx
			
 
				+                # First call raises, second call must still happen.
			
 
				+                mock_complete = AsyncMock(side_effect=[RuntimeError("boom"), None])
			
 
				+                with patch("backend.app.main.on_print_complete", new=mock_complete):
			
 
				+                    count = await reconcile_stale_active_prints(printer_id=1)
			
 
				+        # Only the second archive is recorded as reconciled (first raised).
			
 
				+        assert count == 1
			
 
				+        assert mock_complete.await_count == 2
			
--- a/backend/tests/unit/test_route_auth_coverage.py
+++ b/backend/tests/unit/test_route_auth_coverage.py
@@ -0,0 +1,226 @@
 
				+"""GHSA-gc24 + GHSA-r2qv backstop: every route has an explicit auth dep.
			
 
				+
			
 
				+The "second half" of GHSA-gc24-px2r-5qmf was that 77 endpoints out of 117
			
 
				+responded to anonymous requests with full payloads. The fix at the time
			
 
				+was retroactive — auth deps were added route by route. This test makes
			
 
				+the requirement structural: every FastAPI route at the app-level (HTTP
			
 
				+and WebSocket) is walked, and each one either has an auth dependency or
			
 
				+is in the ``PUBLIC_ROUTES`` allowlist with a justification comment.
			
 
				+
			
 
				+Adding an unauthenticated route now requires touching the allowlist.
			
 
				+The diff makes the intent visible in code review and the entry-with-
			
 
				+reason format documents *why* this is safe (login itself, status
			
 
				+heartbeat, etc.). Drift catches the same failure mode that surfaced
			
 
				+the original advisory.
			
 
				+
			
 
				+The audit also covers WebSocket routes — the proactive sweep that
			
 
				+surfaced finding C1 (`/api/v1/ws` was fully unauthenticated) showed
			
 
				+that an APIRoute-only walk has a blind spot for the very route shape
			
 
				+that produced the most severe disclosure.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import re
			
 
				+
			
 
				+import pytest
			
 
				+from fastapi.routing import APIRoute, APIWebSocketRoute
			
 
				+
			
 
				+from backend.app.main import app
			
 
				+
			
 
				+# Substring patterns identifying auth-bearing callable qualnames in the
			
 
				+# resolved Depends() tree. Inner functions returned by factories carry
			
 
				+# the outer factory's name in their qualname (e.g.
			
 
				+# ``require_permission.<locals>.permission_checker``), so a substring
			
 
				+# check is enough; we don't have to enumerate the inner names.
			
 
				+_AUTH_QUALNAME_PATTERNS: tuple[str, ...] = (
			
 
				+    "require_",  # require_permission, require_permission_if_auth_enabled, require_role, require_admin_*, require_auth_*, require_any_*, require_ownership_*, require_camera_stream_token_*, require_energy_cost_update
			
 
				+    "cloud_caller",  # cloud.py route-level dep
			
 
				+    "_cloud_api_key_gate",  # cloud.py router-level dep
			
 
				+    "resolve_api_key_cloud_owner",  # used by slicer routes that need the API key's owner
			
 
				+    "get_current_user",  # JWT identity resolution
			
 
				+    "get_current_active_user",  # JWT identity resolution
			
 
				+    "get_api_key",  # webhook routes use this directly
			
 
				+    "verify_websocket_token",  # WebSocket route inline check (GHSA-r2qv I-WS)
			
 
				+)
			
 
				+
			
 
				+# Routes that are intentionally accessible without an auth dependency.
			
 
				+# Each entry MUST be (method, path) tuple — the path is matched against
			
 
				+# ``route.path`` literally. To add an entry: include a justification on
			
 
				+# the line above explaining why anonymous access is safe.
			
 
				+_PUBLIC_ROUTES: frozenset[tuple[str, str]] = frozenset(
			
 
				+    {
			
 
				+        # ---- HTTP API: auth bootstrap (pre-credential or token-self-validated) ----
			
 
				+        # First-run setup — runs before any user exists. Idempotent once setup_completed is true.
			
 
				+        ("POST", "/api/v1/auth/setup"),
			
 
				+        # Login itself — credentials in the request body ARE the auth.
			
 
				+        ("POST", "/api/v1/auth/login"),
			
 
				+        # Logout — clears server-side JTI revocation; degraded behaviour on bad token is acceptable.
			
 
				+        ("POST", "/api/v1/auth/logout"),
			
 
				+        # Status heartbeat — used by the login UI to decide whether to show login form.
			
 
				+        ("GET", "/api/v1/auth/status"),
			
 
				+        # Advanced-auth status (whether 2FA / OIDC / LDAP are configured) — read by login form.
			
 
				+        ("GET", "/api/v1/auth/advanced-auth/status"),
			
 
				+        # LDAP status (whether LDAP login is configured) — read by login form.
			
 
				+        ("GET", "/api/v1/auth/ldap/status"),
			
 
				+        # OIDC discovery — login form needs the list of providers + their icons before user picks one.
			
 
				+        ("GET", "/api/v1/auth/oidc/providers"),
			
 
				+        ("GET", "/api/v1/auth/oidc/providers/{provider_id}/icon"),
			
 
				+        # OIDC authorize / callback / exchange — protocol-level handshakes that validate state nonces inline.
			
 
				+        ("GET", "/api/v1/auth/oidc/authorize/{provider_id}"),
			
 
				+        ("GET", "/api/v1/auth/oidc/callback"),
			
 
				+        ("POST", "/api/v1/auth/oidc/exchange"),
			
 
				+        # 2FA send + verify — issued after password check; pre-auth token in cookie is the auth.
			
 
				+        ("POST", "/api/v1/auth/2fa/email/send"),
			
 
				+        ("POST", "/api/v1/auth/2fa/verify"),
			
 
				+        # Forgot-password (anonymous request) + confirm (signed token in the URL).
			
 
				+        ("POST", "/api/v1/auth/forgot-password"),
			
 
				+        ("POST", "/api/v1/auth/forgot-password/confirm"),
			
 
				+        # ---- HTTP API: signed-URL routes (token in path is the auth) ----
			
 
				+        # Signed download URLs — token in path validated by the handler.
			
 
				+        ("GET", "/api/v1/archives/{archive_id}/dl/{token}/{filename}"),
			
 
				+        ("GET", "/api/v1/archives/{archive_id}/source-dl/{token}/{filename}"),
			
 
				+        ("GET", "/api/v1/library/files/{file_id}/dl/{token}/{filename}"),
			
 
				+        # Obico cached frame — one-time nonce embedded in <img> tags.
			
 
				+        ("GET", "/api/v1/obico/cached-frame/{nonce}"),
			
 
				+        # MakerWorld thumbnail proxy — fetches external URL; no Bambuddy data exposed.
			
 
				+        ("GET", "/api/v1/makerworld/thumbnail"),
			
 
				+        # ---- HTTP API: operational + UI-bootstrap (no sensitive data) ----
			
 
				+        # Operational liveness probe — minimal payload, used by container orchestrators.
			
 
				+        ("GET", "/health"),
			
 
				+        # Prometheus metrics — gated by its own bearer token check (constant-time post-I2).
			
 
				+        ("GET", "/api/v1/metrics"),
			
 
				+        # UI bootstrap — defaults for sidebar order and ui-preferences are public defaults that ship with the app.
			
 
				+        ("GET", "/api/v1/settings/default-sidebar-order"),
			
 
				+        ("GET", "/api/v1/settings/ui-preferences"),
			
 
				+        # Slicer printer-models — static catalog, no user data.
			
 
				+        ("GET", "/api/v1/slicer/printer-models"),
			
 
				+        # Current Bambuddy version — public info (already visible in HTTP response headers + Docker tags).
			
 
				+        ("GET", "/api/v1/updates/version"),
			
 
				+        # Webhook routes — auth lives inside the handler via get_api_key() + check_permission(), not as a Depends.
			
 
				+        # Once they all migrate to standard auth deps these entries come out; for now exempting the file.
			
 
				+        ("GET", "/api/v1/webhook/printer/{printer_id}/status"),
			
 
				+        ("GET", "/api/v1/webhook/queue"),
			
 
				+        ("POST", "/api/v1/webhook/printer/{printer_id}/cancel"),
			
 
				+        ("POST", "/api/v1/webhook/printer/{printer_id}/start"),
			
 
				+        ("POST", "/api/v1/webhook/printer/{printer_id}/stop"),
			
 
				+        ("POST", "/api/v1/webhook/queue/add"),
			
 
				+        # ---- Static / SPA routes (not user data) ----
			
 
				+        ("GET", "/"),
			
 
				+        ("GET", "/manifest.json"),
			
 
				+        ("GET", "/sw-register.js"),
			
 
				+        ("GET", "/sw.js"),
			
 
				+        ("GET", "/gcode-viewer/"),
			
 
				+        ("GET", "/gcode-viewer/{file_path:path}"),
			
 
				+        # SPA catch-all — serves index.html for client-side routing. No backend data path.
			
 
				+        ("GET", "/{full_path:path}"),
			
 
				+        # ---- WebSocket routes ----
			
 
				+        # /ws performs an inline ``verify_websocket_token`` check before
			
 
				+        # ``accept()`` (GHSA-r2qv WS fix). The qualname matches one of the
			
 
				+        # auth-bearing patterns above, so this entry is informational — the
			
 
				+        # walker recognises the inline check as auth.
			
 
				+    }
			
 
				+)
			
 
				+
			
 
				+
			
 
				+def _walk_dependant_qualnames(dependant) -> list[str]:
			
 
				+    """Flatten the dependant tree to a list of callable qualnames."""
			
 
				+    names: list[str] = []
			
 
				+    if dependant is None:
			
 
				+        return names
			
 
				+    if dependant.call:
			
 
				+        names.append(getattr(dependant.call, "__qualname__", "?"))
			
 
				+    for sub in dependant.dependencies:
			
 
				+        names.extend(_walk_dependant_qualnames(sub))
			
 
				+    return names
			
 
				+
			
 
				+
			
 
				+def _has_auth_dep(dependant) -> bool:
			
 
				+    """True if any callable in the dependant tree matches an auth pattern."""
			
 
				+    return any(any(p in qn for p in _AUTH_QUALNAME_PATTERNS) for qn in _walk_dependant_qualnames(dependant))
			
 
				+
			
 
				+
			
 
				+def _ws_endpoint_does_inline_token_check(route: APIWebSocketRoute) -> bool:
			
 
				+    """True if the websocket endpoint reads its source uses ``verify_websocket_token``.
			
 
				+
			
 
				+    WebSocket routes don't pass auth via the standard Depends machinery
			
 
				+    (the WebSocket handshake doesn't carry headers), so the auth check
			
 
				+    lives inline in the endpoint body. We confirm by inspecting the
			
 
				+    endpoint function's source text — looking for an actual call to
			
 
				+    ``verify_websocket_token``. A docstring-only mention would NOT
			
 
				+    satisfy this check (we look for a call-shaped pattern, not a
			
 
				+    substring).
			
 
				+    """
			
 
				+    import inspect
			
 
				+
			
 
				+    try:
			
 
				+        source = inspect.getsource(route.endpoint)
			
 
				+    except (OSError, TypeError):
			
 
				+        return False
			
 
				+    return bool(re.search(r"\bverify_websocket_token\s*\(", source))
			
 
				+
			
 
				+
			
 
				+@pytest.mark.unit
			
 
				+def test_routes_have_explicit_auth_deps() -> None:
			
 
				+    """SEC-AUTH-1 (SECURITY.md): every API route has an auth dep or is in the public allowlist.
			
 
				+
			
 
				+    Walks both ``APIRoute`` (HTTP) and ``APIWebSocketRoute`` (WS)
			
 
				+    objects on the live FastAPI app. For each, asserts that at least
			
 
				+    one of the resolved Depends in the dependant tree matches an auth-
			
 
				+    bearing qualname, OR that the (method, path) pair is in the
			
 
				+    explicit public-route allowlist, OR (for WebSocket routes) that
			
 
				+    the endpoint performs an inline ``verify_websocket_token`` check.
			
 
				+
			
 
				+    Failure means a new route is reachable anonymously without being
			
 
				+    documented as such — the GHSA-gc24 / GHSA-r2qv shape.
			
 
				+    """
			
 
				+    failures: list[str] = []
			
 
				+
			
 
				+    for route in app.routes:
			
 
				+        if isinstance(route, APIRoute):
			
 
				+            method = sorted(route.methods)[0] if route.methods else "GET"
			
 
				+            if _has_auth_dep(route.dependant):
			
 
				+                continue
			
 
				+            if (method, route.path) in _PUBLIC_ROUTES:
			
 
				+                continue
			
 
				+            failures.append(f"  {method:7} {route.path}  → no auth dep, not in _PUBLIC_ROUTES allowlist")
			
 
				+        elif isinstance(route, APIWebSocketRoute):
			
 
				+            if _has_auth_dep(route.dependant):
			
 
				+                continue
			
 
				+            if _ws_endpoint_does_inline_token_check(route):
			
 
				+                continue
			
 
				+            if ("WS", route.path) in _PUBLIC_ROUTES:
			
 
				+                continue
			
 
				+            failures.append(f"  WS      {route.path}  → no auth dep, no inline token check, not in _PUBLIC_ROUTES")
			
 
				+
			
 
				+    assert not failures, (
			
 
				+        "Routes without an auth dependency that aren't in the public allowlist. "
			
 
				+        "Either add a ``Depends(require_*)`` to the route OR add the (method, path) "
			
 
				+        "to ``_PUBLIC_ROUTES`` with a comment justifying why anonymous access is safe. "
			
 
				+        "See SECURITY.md rule 1 'Allowlist over denylist' (route allowlist sub-section).\n\n" + "\n".join(failures)
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+@pytest.mark.unit
			
 
				+def test_public_routes_allowlist_matches_real_routes() -> None:
			
 
				+    """Drift-detection: every (method, path) in ``_PUBLIC_ROUTES`` must exist on the app.
			
 
				+
			
 
				+    If a route is renamed or removed, the entry for it in the allowlist
			
 
				+    becomes dead — a residual rubber-stamp that does nothing but leaves
			
 
				+    the impression that the route still has anonymous access. This test
			
 
				+    flags those.
			
 
				+    """
			
 
				+    real_routes: set[tuple[str, str]] = set()
			
 
				+    for route in app.routes:
			
 
				+        if isinstance(route, APIRoute):
			
 
				+            method = sorted(route.methods)[0] if route.methods else "GET"
			
 
				+            real_routes.add((method, route.path))
			
 
				+        elif isinstance(route, APIWebSocketRoute):
			
 
				+            real_routes.add(("WS", route.path))
			
 
				+
			
 
				+    stale = sorted(_PUBLIC_ROUTES - real_routes)
			
 
				+    assert not stale, (
			
 
				+        "_PUBLIC_ROUTES contains entries that no longer match any real route. "
			
 
				+        "Remove these stale entries (the route was renamed, removed, or its method changed).\n\n"
			
 
				+        + "\n".join(f"  {m:7} {p}" for m, p in stale)
			
 
				+    )
			
--- a/backend/tests/unit/test_runtime_tracking_pause.py
+++ b/backend/tests/unit/test_runtime_tracking_pause.py
@@ -0,0 +1,155 @@
 
				+"""Regression tests for the runtime-tracking task (#1521).
			
 
				+
			
 
				+The ``runtime_seconds`` counter on each printer feeds hours-based maintenance
			
 
				+intervals (rod lubrication, belt checks, nozzle cleaning). It was accumulating
			
 
				+elapsed time whenever ``state.state`` was ``RUNNING`` *or* ``PAUSE``, which
			
 
				+meant a print paused for hours (e.g. overnight) inflated the maintenance
			
 
				+clock without any actual mechanical wear. Fix excludes PAUSE; these tests
			
 
				+pin the new contract.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import asyncio
			
 
				+from datetime import datetime, timedelta, timezone
			
 
				+from types import SimpleNamespace
			
 
				+from unittest.mock import patch
			
 
				+
			
 
				+import pytest
			
 
				+from sqlalchemy import select
			
 
				+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
			
 
				+
			
 
				+
			
 
				+async def _build_db_with_printer(*, runtime_seconds: int, last_runtime_update: datetime | None):
			
 
				+    """Spin up an in-memory DB with one active printer in the requested state."""
			
 
				+    import backend.app.models  # noqa: F401  -- register all models on Base.metadata
			
 
				+    from backend.app.core.database import Base
			
 
				+    from backend.app.models.printer import Printer
			
 
				+
			
 
				+    engine = create_async_engine("sqlite+aiosqlite:///:memory:", echo=False)
			
 
				+    async with engine.begin() as conn:
			
 
				+        await conn.run_sync(Base.metadata.create_all)
			
 
				+    session_maker = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
			
 
				+
			
 
				+    async with session_maker() as db:
			
 
				+        db.add(
			
 
				+            Printer(
			
 
				+                id=1,
			
 
				+                name="P1",
			
 
				+                serial_number="S1",
			
 
				+                ip_address="1.1.1.1",
			
 
				+                access_code="x",
			
 
				+                is_active=True,
			
 
				+                runtime_seconds=runtime_seconds,
			
 
				+                last_runtime_update=last_runtime_update,
			
 
				+            )
			
 
				+        )
			
 
				+        await db.commit()
			
 
				+    return engine, session_maker
			
 
				+
			
 
				+
			
 
				+async def _run_one_iteration(session_maker, state_value: str):
			
 
				+    """Run a single iteration of track_printer_runtime() against a mocked state.
			
 
				+
			
 
				+    Patches ``asyncio.sleep`` to skip the startup wait and cancel after the
			
 
				+    first loop tick. Patches ``printer_manager.get_status`` to return a fake
			
 
				+    state with the requested ``.state`` value. Points the module-level
			
 
				+    ``async_session`` at the test DB so the loop's queries hit it.
			
 
				+    """
			
 
				+    from backend.app import main as app_main
			
 
				+
			
 
				+    sleep_calls = {"count": 0}
			
 
				+    real_sleep = asyncio.sleep
			
 
				+
			
 
				+    async def fake_sleep(seconds, *args, **kwargs):
			
 
				+        sleep_calls["count"] += 1
			
 
				+        # First sleep = the 15s startup wait. Second sleep = end-of-iteration
			
 
				+        # tick; raise here so the loop exits cleanly via its CancelledError
			
 
				+        # handler after exactly one work cycle.
			
 
				+        if sleep_calls["count"] >= 2:
			
 
				+            raise asyncio.CancelledError()
			
 
				+        # Yield control to keep the event loop healthy without blocking.
			
 
				+        await real_sleep(0)
			
 
				+
			
 
				+    fake_state = SimpleNamespace(state=state_value, connected=True)
			
 
				+
			
 
				+    # The loop's tail-of-iteration sleep is OUTSIDE its try/except, so the
			
 
				+    # CancelledError raised from fake_sleep propagates out of the function
			
 
				+    # rather than triggering the inner break — catch it at the test boundary.
			
 
				+    with (
			
 
				+        patch.object(app_main, "async_session", session_maker),
			
 
				+        patch.object(app_main.printer_manager, "get_status", return_value=fake_state),
			
 
				+        patch.object(app_main.asyncio, "sleep", fake_sleep),
			
 
				+        pytest.raises(asyncio.CancelledError),
			
 
				+    ):
			
 
				+        await app_main.track_printer_runtime()
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_pause_state_does_not_accumulate_runtime():
			
 
				+    """PAUSE must NOT add to runtime_seconds — paused = no motion = no wear (#1521)."""
			
 
				+    seeded_runtime = 1000  # 1000s already accumulated
			
 
				+    seeded_last_update = datetime.now(timezone.utc) - timedelta(seconds=300)  # 5min ago
			
 
				+    engine, session_maker = await _build_db_with_printer(
			
 
				+        runtime_seconds=seeded_runtime, last_runtime_update=seeded_last_update
			
 
				+    )
			
 
				+
			
 
				+    await _run_one_iteration(session_maker, state_value="PAUSE")
			
 
				+
			
 
				+    from backend.app.models.printer import Printer
			
 
				+
			
 
				+    async with session_maker() as db:
			
 
				+        row = (await db.execute(select(Printer).where(Printer.id == 1))).scalar_one()
			
 
				+        # Runtime counter unchanged — the 5 minutes paused contributed nothing.
			
 
				+        assert row.runtime_seconds == seeded_runtime
			
 
				+        # last_runtime_update cleared on the non-running branch so the next
			
 
				+        # transition to RUNNING starts fresh and doesn't back-bill paused time.
			
 
				+        assert row.last_runtime_update is None
			
 
				+
			
 
				+    await engine.dispose()
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_running_state_still_accumulates_runtime():
			
 
				+    """RUNNING must continue to accumulate — the bug was scope, not the whole feature."""
			
 
				+    seeded_runtime = 1000
			
 
				+    seeded_last_update = datetime.now(timezone.utc) - timedelta(seconds=60)
			
 
				+    engine, session_maker = await _build_db_with_printer(
			
 
				+        runtime_seconds=seeded_runtime, last_runtime_update=seeded_last_update
			
 
				+    )
			
 
				+
			
 
				+    await _run_one_iteration(session_maker, state_value="RUNNING")
			
 
				+
			
 
				+    from backend.app.models.printer import Printer
			
 
				+
			
 
				+    async with session_maker() as db:
			
 
				+        row = (await db.execute(select(Printer).where(Printer.id == 1))).scalar_one()
			
 
				+        # Wall-clock elapsed since seeded_last_update should now be added.
			
 
				+        # Allow a generous lower bound (≥30s) — actual elapsed depends on
			
 
				+        # how fast the test runs, but it MUST have grown past the seed.
			
 
				+        assert row.runtime_seconds > seeded_runtime
			
 
				+        assert row.runtime_seconds >= seeded_runtime + 30
			
 
				+        assert row.last_runtime_update is not None
			
 
				+
			
 
				+    await engine.dispose()
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_idle_state_clears_last_update_without_accumulating():
			
 
				+    """A non-active state (FINISH/IDLE/PREPARE/etc.) must clear last_runtime_update
			
 
				+    so a later RUNNING transition doesn't retroactively back-bill all the idle time."""
			
 
				+    seeded_runtime = 1000
			
 
				+    seeded_last_update = datetime.now(timezone.utc) - timedelta(seconds=3600)  # 1h ago
			
 
				+    engine, session_maker = await _build_db_with_printer(
			
 
				+        runtime_seconds=seeded_runtime, last_runtime_update=seeded_last_update
			
 
				+    )
			
 
				+
			
 
				+    await _run_one_iteration(session_maker, state_value="FINISH")
			
 
				+
			
 
				+    from backend.app.models.printer import Printer
			
 
				+
			
 
				+    async with session_maker() as db:
			
 
				+        row = (await db.execute(select(Printer).where(Printer.id == 1))).scalar_one()
			
 
				+        assert row.runtime_seconds == seeded_runtime  # no accumulation
			
 
				+        assert row.last_runtime_update is None  # cleared, prevents back-bill
			
 
				+    await engine.dispose()
			
--- a/backend/tests/unit/test_safe_path.py
+++ b/backend/tests/unit/test_safe_path.py
@@ -0,0 +1,124 @@
 
				+"""Tests for ``backend.app.utils.safe_path.safe_join_under``.
			
 
				+
			
 
				+Cover every escape vector documented in the helper plus the legitimate
			
 
				+nested-path use case so the helper's behaviour is locked in.
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+from pathlib import Path
			
 
				+
			
 
				+import pytest
			
 
				+from fastapi import HTTPException
			
 
				+
			
 
				+from backend.app.utils.safe_path import (
			
 
				+    PathTraversalError,
			
 
				+    assert_under,
			
 
				+    safe_join_under,
			
 
				+)
			
 
				+
			
 
				+
			
 
				+@pytest.fixture()
			
 
				+def library(tmp_path: Path) -> Path:
			
 
				+    """A real on-disk directory that mimics the "trusted parent" role."""
			
 
				+    lib = tmp_path / "library"
			
 
				+    lib.mkdir()
			
 
				+    return lib
			
 
				+
			
 
				+
			
 
				+class TestSafeJoinUnder:
			
 
				+    def test_simple_filename_is_joined(self, library: Path):
			
 
				+        result = safe_join_under(library, "model.3mf")
			
 
				+        assert result == (library / "model.3mf").resolve()
			
 
				+
			
 
				+    def test_nested_path_components_are_joined(self, library: Path):
			
 
				+        result = safe_join_under(library, "myfolder", "sub", "file.3mf")
			
 
				+        assert result == (library / "myfolder" / "sub" / "file.3mf").resolve()
			
 
				+
			
 
				+    def test_absolute_path_rejected(self, library: Path):
			
 
				+        # The exact shape that produced the original CVE — ``Path("/lib") / "/etc/passwd"``
			
 
				+        # collapses to ``Path("/etc/passwd")`` in Python's pathlib.
			
 
				+        with pytest.raises(HTTPException) as exc:
			
 
				+            safe_join_under(library, "/etc/passwd")
			
 
				+        assert exc.value.status_code == 400
			
 
				+
			
 
				+    def test_absolute_windows_path_rejected(self, library: Path):
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "\\\\evil\\share\\x")
			
 
				+
			
 
				+    def test_parent_traversal_rejected(self, library: Path):
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "..", "etc", "passwd")
			
 
				+
			
 
				+    def test_embedded_parent_traversal_rejected(self, library: Path):
			
 
				+        # ``library/foo/../../etc/passwd`` resolves outside ``library``.
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "foo", "..", "..", "etc", "passwd")
			
 
				+
			
 
				+    def test_null_byte_rejected(self, library: Path):
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "evil\x00.3mf")
			
 
				+
			
 
				+    def test_empty_string_part_rejected(self, library: Path):
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "")
			
 
				+
			
 
				+    def test_no_parts_rejected(self, library: Path):
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library)
			
 
				+
			
 
				+    def test_non_string_part_rejected(self, library: Path):
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, 42)  # type: ignore[arg-type]
			
 
				+
			
 
				+    def test_http_false_raises_path_traversal_error(self, library: Path):
			
 
				+        with pytest.raises(PathTraversalError):
			
 
				+            safe_join_under(library, "/etc/passwd", http=False)
			
 
				+
			
 
				+    def test_http_false_allows_clean_join(self, library: Path):
			
 
				+        result = safe_join_under(library, "ok.txt", http=False)
			
 
				+        assert result == (library / "ok.txt").resolve()
			
 
				+
			
 
				+    def test_returned_path_is_resolved(self, library: Path):
			
 
				+        # The helper returns a resolved path so callers don't need to do it
			
 
				+        # themselves — every downstream is_relative_to/parent check assumes
			
 
				+        # a canonical form.
			
 
				+        result = safe_join_under(library, "x.txt")
			
 
				+        assert result == result.resolve()
			
 
				+
			
 
				+
			
 
				+class TestAssertUnder:
			
 
				+    def test_inside_passes(self, library: Path):
			
 
				+        candidate = library / "x" / "y" / "z.txt"
			
 
				+        out = assert_under(library, candidate)
			
 
				+        assert out == candidate.resolve()
			
 
				+
			
 
				+    def test_outside_rejects(self, library: Path, tmp_path: Path):
			
 
				+        outside = tmp_path / "elsewhere" / "evil.txt"
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            assert_under(library, outside)
			
 
				+
			
 
				+    def test_outside_raises_path_traversal_error_with_http_false(self, library: Path, tmp_path: Path):
			
 
				+        outside = tmp_path / "elsewhere" / "evil.txt"
			
 
				+        with pytest.raises(PathTraversalError):
			
 
				+            assert_under(library, outside, http=False)
			
 
				+
			
 
				+
			
 
				+class TestPocReproducer:
			
 
				+    """The exact attacker payload from the advisory.
			
 
				+
			
 
				+    A directly attacker-controlled folder name pointing at a venv's
			
 
				+    site-packages directory used to land a ``.pth`` file on disk. With the
			
 
				+    helper in place the join now raises before any write.
			
 
				+    """
			
 
				+
			
 
				+    def test_advisory_poc_target_dir_rejected(self, library: Path):
			
 
				+        # Verbatim shape from the advisory POC.
			
 
				+        target_dir = "BAMBUDDY_BASE_DIR/bambuddy/venv/lib/python3.14/site-packages"
			
 
				+        # Leading slash → absolute → rejected up-front.
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "/" + target_dir)
			
 
				+        # No leading slash but with ``..`` traversal embedded in the
			
 
				+        # follow-up file path — also rejected.
			
 
				+        with pytest.raises(HTTPException):
			
 
				+            safe_join_under(library, "innocent", "..", "..", "evil.pth")
			
--- a/backend/tests/unit/test_slicer_presets.py
+++ b/backend/tests/unit/test_slicer_presets.py
@@ -286,6 +286,60 @@ class TestFetchCloudPresets:
 
				         assert first["printer"][0].name == "OldAccountX1C"
			
 
				         assert second["printer"][0].name == "NewAccountX1C"
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_refresh_bypasses_cloud_cache(self):
			
 
				+        """``refresh=True`` must skip an otherwise-warm cache entry and hit
			
 
				+        Bambu Cloud again — wiring for the SliceModal's Refresh button so a
			
 
				+        user who deletes a cloud preset in Bambu Studio / Handy doesn't have
			
 
				+        to wait for the 5-minute TTL to expire (#1581)."""
			
 
				+        sp._cloud_cache.clear()
			
 
				+        cloud_mock = MagicMock()
			
 
				+        cloud_mock.set_token = MagicMock()
			
 
				+        cloud_mock.get_slicer_settings = AsyncMock(
			
 
				+            return_value={
			
 
				+                "printer": {"private": [{"setting_id": "id1", "name": "X1C"}], "public": []},
			
 
				+                "print": {"private": [], "public": []},
			
 
				+                "filament": {"private": [], "public": []},
			
 
				+            }
			
 
				+        )
			
 
				+        cloud_mock.close = AsyncMock()
			
 
				+        user = _user_with_cloud_auth(user_id=99)
			
 
				+        with (
			
 
				+            patch.object(sp, "get_stored_token", AsyncMock(return_value=("tok", None, None))),
			
 
				+            patch.object(sp, "BambuCloudService", return_value=cloud_mock),
			
 
				+        ):
			
 
				+            await sp._fetch_cloud_presets(MagicMock(), user)
			
 
				+            # Without refresh, the second call hits cache (covered by
			
 
				+            # test_cache_hit_skips_cloud_call). With refresh=True it MUST
			
 
				+            # re-fetch.
			
 
				+            await sp._fetch_cloud_presets(MagicMock(), user, refresh=True)
			
 
				+        assert cloud_mock.get_slicer_settings.await_count == 2
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_refresh_writes_back_to_cache(self):
			
 
				+        """A refresh call must still update the cache so a subsequent normal
			
 
				+        call doesn't re-hit the cloud immediately afterwards."""
			
 
				+        sp._cloud_cache.clear()
			
 
				+        cloud_mock = MagicMock()
			
 
				+        cloud_mock.set_token = MagicMock()
			
 
				+        cloud_mock.get_slicer_settings = AsyncMock(
			
 
				+            return_value={
			
 
				+                "printer": {"private": [{"setting_id": "id1", "name": "X1C"}], "public": []},
			
 
				+                "print": {"private": [], "public": []},
			
 
				+                "filament": {"private": [], "public": []},
			
 
				+            }
			
 
				+        )
			
 
				+        cloud_mock.close = AsyncMock()
			
 
				+        user = _user_with_cloud_auth(user_id=101)
			
 
				+        with (
			
 
				+            patch.object(sp, "get_stored_token", AsyncMock(return_value=("tok", None, None))),
			
 
				+            patch.object(sp, "BambuCloudService", return_value=cloud_mock),
			
 
				+        ):
			
 
				+            await sp._fetch_cloud_presets(MagicMock(), user, refresh=True)
			
 
				+            await sp._fetch_cloud_presets(MagicMock(), user)
			
 
				+        # Two calls — first refresh, second a normal cache hit.
			
 
				+        assert cloud_mock.get_slicer_settings.await_count == 1
			
 
				+
			
 
				 
			
 
				 class TestFetchBundledPresets:
			
 
				     """Standard tier reaches out to the slicer-api sidecar; tolerate the
			
@@ -356,6 +410,41 @@ class TestFetchBundledPresets:
 
				             slots = await sp._fetch_bundled_presets(MagicMock())
			
 
				         assert slots["printer"][0].name == "Cached"
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_refresh_bypasses_bundled_cache(self):
			
 
				+        """``refresh=True`` must re-hit the sidecar even when the in-process
			
 
				+        cache is warm — paired with the cloud-cache refresh, this is what
			
 
				+        powers the SliceModal's Refresh button (#1581)."""
			
 
				+        sp._bundled_cache = (
			
 
				+            time.monotonic(),
			
 
				+            {
			
 
				+                "printer": [UnifiedPreset(id="Stale", name="Stale", source="standard")],
			
 
				+                "process": [],
			
 
				+                "filament": [],
			
 
				+            },
			
 
				+        )
			
 
				+        svc_mock = MagicMock()
			
 
				+        svc_mock.list_bundled_profiles = AsyncMock(
			
 
				+            return_value={
			
 
				+                "printer": [{"name": "Fresh", "base_id": None}],
			
 
				+                "process": [],
			
 
				+                "filament": [],
			
 
				+            }
			
 
				+        )
			
 
				+        svc_mock.__aenter__ = AsyncMock(return_value=svc_mock)
			
 
				+        svc_mock.__aexit__ = AsyncMock(return_value=False)
			
 
				+        with (
			
 
				+            patch.object(sp, "_resolve_slicer_api_url", AsyncMock(return_value="http://ok")),
			
 
				+            patch.object(sp, "SlicerApiService", return_value=svc_mock),
			
 
				+        ):
			
 
				+            slots = await sp._fetch_bundled_presets(MagicMock(), refresh=True)
			
 
				+        svc_mock.list_bundled_profiles.assert_awaited_once()
			
 
				+        assert [p.name for p in slots["printer"]] == ["Fresh"]
			
 
				+        # The fresh result must also be written back to the cache so a
			
 
				+        # subsequent normal (non-refresh) call doesn't re-hit the sidecar.
			
 
				+        assert sp._bundled_cache is not None
			
 
				+        assert [p.name for p in sp._bundled_cache[1]["printer"]] == ["Fresh"]
			
 
				+
			
 
				 
			
 
				 class TestResolveSlicerApiUrl:
			
 
				     """`_resolve_slicer_api_url` must respect the user's `preferred_slicer`
			
--- a/backend/tests/unit/test_usage_tracker.py
+++ b/backend/tests/unit/test_usage_tracker.py
@@ -1753,6 +1753,158 @@ class TestMqttMappingIntegration:
 
				         assert results[0]["tray_id"] == 2  # From print_cmd mapping, not MQTT
			
 
				 
			
 
				 
			
 
				+class TestPositionBasedFallbackEmptyAmsSlot:
			
 
				+    """Position-based mapping fallback (#1607): when no explicit mapping is
			
 
				+    available, the slicer's Nth filament must map to the Nth *loaded* AMS tray
			
 
				+    (skipping empty slots), not the Nth physical slot position. BambuStudio /
			
 
				+    OrcaSlicer compact their filament-assignment UI by hiding unloaded AMS
			
 
				+    slots, so the 3MF slot list is dense even when the AMS itself has gaps."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_external_routed_correctly_when_ams_has_empty_middle_slot(self):
			
 
				+        """Reporter's scenario: AMS trays 0-2 loaded, tray 3 empty, external
			
 
				+        loaded. Slicer emits 4 filaments — slot 4 = external. Without the fix
			
 
				+        the position-based fallback maps slot 4 to the empty AMS tray 3
			
 
				+        (since `available_trays = [0, 1, 2, 3, 254]`) and external usage is
			
 
				+        silently dropped because no spool is assigned to AMS0-T3.
			
 
				+        After the fix, empty AMS slots are filtered (tray_type is empty) so
			
 
				+        `available_trays = [0, 1, 2, 254]` and slot 4 correctly resolves to
			
 
				+        the external (global tray 254 → AMS255-T0)."""
			
 
				+        # Spool fed via external (vt_tray 254 → AMS255-T0)
			
 
				+        spool = _make_spool(spool_id=42, label_weight=1000)
			
 
				+        assignment = _make_assignment(spool_id=42, ams_id=255, tray_id=0)
			
 
				+        archive = _make_archive(archive_id=70)
			
 
				+
			
 
				+        # db: archive, queue_item(None), assignment, spool
			
 
				+        db = _mock_db_sequential([archive, None, assignment, spool])
			
 
				+
			
 
				+        # AMS reports 4 physical tray slots but slot 3 has no spool (empty
			
 
				+        # tray_type); external spool is loaded in vt_tray.
			
 
				+        # No `mapping` field on the state — forces fallback through path 5.
			
 
				+        printer_manager = MagicMock()
			
 
				+        printer_manager.get_status.return_value = SimpleNamespace(
			
 
				+            raw_data={
			
 
				+                "ams": [
			
 
				+                    {
			
 
				+                        "id": 0,
			
 
				+                        "tray": [
			
 
				+                            {"id": 0, "tray_type": "PLA"},
			
 
				+                            {"id": 1, "tray_type": "PETG"},
			
 
				+                            {"id": 2, "tray_type": "ABS"},
			
 
				+                            {"id": 3, "tray_type": ""},  # empty slot
			
 
				+                        ],
			
 
				+                    }
			
 
				+                ],
			
 
				+                "vt_tray": [{"id": 254, "tray_type": "PLA"}],
			
 
				+            },
			
 
				+            progress=100,
			
 
				+            layer_num=50,
			
 
				+            tray_now=254,
			
 
				+            tray_change_log=[],
			
 
				+        )
			
 
				+
			
 
				+        # 3MF has 4 dense filament slots — slot 4 is the external. Only slot 4
			
 
				+        # has weight (other slots came from AMS spools handled separately).
			
 
				+        filament_usage = [{"slot_id": 4, "used_g": 12.3, "type": "PLA", "color": "#00AABB"}]
			
 
				+        handled_trays: set[tuple[int, int]] = set()
			
 
				+
			
 
				+        with (
			
 
				+            patch("backend.app.core.config.settings") as mock_settings,
			
 
				+            patch(
			
 
				+                "backend.app.utils.threemf_tools.extract_filament_usage_from_3mf",
			
 
				+                return_value=filament_usage,
			
 
				+            ),
			
 
				+        ):
			
 
				+            mock_settings.base_dir = MagicMock()
			
 
				+            mock_path = MagicMock()
			
 
				+            mock_path.exists.return_value = True
			
 
				+            mock_settings.base_dir.__truediv__ = MagicMock(return_value=mock_path)
			
 
				+
			
 
				+            results = await _track_from_3mf(
			
 
				+                printer_id=1,
			
 
				+                archive_id=70,
			
 
				+                status="completed",
			
 
				+                print_name="External + AMS print",
			
 
				+                handled_trays=handled_trays,
			
 
				+                printer_manager=printer_manager,
			
 
				+                db=db,
			
 
				+            )
			
 
				+
			
 
				+        assert len(results) == 1
			
 
				+        # The external spool was charged, NOT the empty AMS slot.
			
 
				+        assert results[0]["spool_id"] == 42
			
 
				+        assert results[0]["ams_id"] == 255
			
 
				+        assert results[0]["tray_id"] == 0
			
 
				+        assert results[0]["weight_used"] == 12.3
			
 
				+        assert (255, 0) in handled_trays
			
 
				+        # Critical assertion: AMS0-T3 (the empty slot) was NOT charged.
			
 
				+        assert (0, 3) not in handled_trays
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_dense_ams_unchanged_no_empty_slots(self):
			
 
				+        """Sanity check: when every AMS slot is loaded, the position-based
			
 
				+        fallback still works for the slicer's external = last slot case."""
			
 
				+        spool = _make_spool(spool_id=99, label_weight=1000)
			
 
				+        assignment = _make_assignment(spool_id=99, ams_id=255, tray_id=0)
			
 
				+        archive = _make_archive(archive_id=71)
			
 
				+
			
 
				+        db = _mock_db_sequential([archive, None, assignment, spool])
			
 
				+
			
 
				+        printer_manager = MagicMock()
			
 
				+        printer_manager.get_status.return_value = SimpleNamespace(
			
 
				+            raw_data={
			
 
				+                "ams": [
			
 
				+                    {
			
 
				+                        "id": 0,
			
 
				+                        "tray": [
			
 
				+                            {"id": 0, "tray_type": "PLA"},
			
 
				+                            {"id": 1, "tray_type": "PETG"},
			
 
				+                            {"id": 2, "tray_type": "ABS"},
			
 
				+                            {"id": 3, "tray_type": "TPU"},
			
 
				+                        ],
			
 
				+                    }
			
 
				+                ],
			
 
				+                "vt_tray": [{"id": 254, "tray_type": "PLA"}],
			
 
				+            },
			
 
				+            progress=100,
			
 
				+            layer_num=50,
			
 
				+            tray_now=254,
			
 
				+            tray_change_log=[],
			
 
				+        )
			
 
				+
			
 
				+        # 5 filaments, slot 5 = external. available_trays = [0,1,2,3,254] →
			
 
				+        # slot_id=5 → available_trays[4] = 254.
			
 
				+        filament_usage = [{"slot_id": 5, "used_g": 7.5, "type": "PLA", "color": ""}]
			
 
				+        handled_trays: set[tuple[int, int]] = set()
			
 
				+
			
 
				+        with (
			
 
				+            patch("backend.app.core.config.settings") as mock_settings,
			
 
				+            patch(
			
 
				+                "backend.app.utils.threemf_tools.extract_filament_usage_from_3mf",
			
 
				+                return_value=filament_usage,
			
 
				+            ),
			
 
				+        ):
			
 
				+            mock_settings.base_dir = MagicMock()
			
 
				+            mock_path = MagicMock()
			
 
				+            mock_path.exists.return_value = True
			
 
				+            mock_settings.base_dir.__truediv__ = MagicMock(return_value=mock_path)
			
 
				+
			
 
				+            results = await _track_from_3mf(
			
 
				+                printer_id=1,
			
 
				+                archive_id=71,
			
 
				+                status="completed",
			
 
				+                print_name="Dense AMS + external",
			
 
				+                handled_trays=handled_trays,
			
 
				+                printer_manager=printer_manager,
			
 
				+                db=db,
			
 
				+            )
			
 
				+
			
 
				+        assert len(results) == 1
			
 
				+        assert results[0]["spool_id"] == 99
			
 
				+        assert results[0]["ams_id"] == 255
			
 
				+        assert results[0]["tray_id"] == 0
			
 
				+
			
 
				+
			
 
				 class TestNotificationVariables:
			
 
				     """Tests for filament_details formatting in notifications."""
			
 
				 
			
--- a/backend/tests/unit/test_vp_certificate_rotation.py
+++ b/backend/tests/unit/test_vp_certificate_rotation.py
@@ -0,0 +1,76 @@
 
				+"""Tests for CertificateService.ensure_certificates' CA-rotation guard.
			
 
				+
			
 
				+When the shared CA is regenerated (e.g. its expiry crossed
			
 
				+``CA_EXPIRY_THRESHOLD_DAYS``), any per-VP printer certificate that was
			
 
				+signed by the OLD CA becomes orphaned: it still exists on disk and the
			
 
				+old fallback ``cert_path.exists()`` check would happily reuse it. A
			
 
				+slicer that imported the NEW CA then fails the TLS handshake because
			
 
				+the printer cert's issuer doesn't match anything in its trust store.
			
 
				+
			
 
				+``_cert_matches_current_ca`` is the guard. It compares the on-disk
			
 
				+printer cert's issuer against the on-disk CA cert's subject; on
			
 
				+mismatch ``ensure_certificates`` regenerates the per-VP cert under the
			
 
				+current CA.
			
 
				+"""
			
 
				+
			
 
				+from backend.app.services.virtual_printer.certificate import CertificateService
			
 
				+
			
 
				+
			
 
				+def test_ensure_certificates_reuses_cert_when_issuer_matches_ca(tmp_path):
			
 
				+    """Happy path: a freshly-generated CA + per-VP cert pair shares
			
 
				+    issuer/subject. ``ensure_certificates`` reads them back without
			
 
				+    regenerating."""
			
 
				+    svc = CertificateService(cert_dir=tmp_path, serial="01P00A391800001")
			
 
				+
			
 
				+    # First call: generates the CA + per-VP cert from scratch.
			
 
				+    first_cert, first_key = svc.ensure_certificates()
			
 
				+    first_cert_bytes = first_cert.read_bytes()
			
 
				+
			
 
				+    # Second call: cert + CA exist and the issuer matches. Should reuse.
			
 
				+    second_cert, _ = svc.ensure_certificates()
			
 
				+    assert second_cert.read_bytes() == first_cert_bytes
			
 
				+
			
 
				+
			
 
				+def test_ensure_certificates_regenerates_when_ca_rotated(tmp_path):
			
 
				+    """CA rotation scenario: the CA file is replaced with a different one
			
 
				+    (e.g. previous expired and was regenerated). The per-VP cert on disk
			
 
				+    was signed by the old CA, so its issuer no longer matches the new CA's
			
 
				+    subject. ``ensure_certificates`` must regenerate the per-VP cert."""
			
 
				+    # Build the first pair.
			
 
				+    svc1 = CertificateService(cert_dir=tmp_path, serial="01P00A391800001")
			
 
				+    orig_cert_bytes = svc1.ensure_certificates()[0].read_bytes()
			
 
				+    orig_ca_bytes = svc1.ca_cert_path.read_bytes()
			
 
				+
			
 
				+    # Simulate CA rotation: build a SECOND CA in a different dir, then
			
 
				+    # swap that CA's files into the original CA path. The per-VP cert
			
 
				+    # still on disk was signed by the original CA — issuer mismatch now.
			
 
				+    rotated_dir = tmp_path / "rotated"
			
 
				+    rotated_dir.mkdir()
			
 
				+    svc_rotated = CertificateService(cert_dir=rotated_dir, serial="01P00A391800002")
			
 
				+    svc_rotated.ensure_certificates()
			
 
				+
			
 
				+    # Overwrite the original CA on disk with the rotated one.
			
 
				+    svc1.ca_cert_path.write_bytes(svc_rotated.ca_cert_path.read_bytes())
			
 
				+    svc1.ca_key_path.write_bytes(svc_rotated.ca_key_path.read_bytes())
			
 
				+    assert svc1.ca_cert_path.read_bytes() != orig_ca_bytes  # confirm rotation
			
 
				+
			
 
				+    # Build a fresh service against the rotated CA, then ensure_certificates
			
 
				+    # should detect the mismatch and regenerate the per-VP cert.
			
 
				+    svc2 = CertificateService(cert_dir=tmp_path, serial="01P00A391800001")
			
 
				+    new_cert, _ = svc2.ensure_certificates()
			
 
				+    new_cert_bytes = new_cert.read_bytes()
			
 
				+
			
 
				+    # New per-VP cert must differ from the old (signed by a different CA now).
			
 
				+    assert new_cert_bytes != orig_cert_bytes
			
 
				+
			
 
				+
			
 
				+def test_cert_matches_current_ca_returns_false_when_no_ca(tmp_path):
			
 
				+    """If the CA file is missing entirely, the match check must return
			
 
				+    False so ``ensure_certificates`` falls through to ``generate_certificates``
			
 
				+    instead of returning a per-VP cert that nothing can validate."""
			
 
				+    svc = CertificateService(cert_dir=tmp_path, serial="01P00A391800001")
			
 
				+    # Write a per-VP cert without a CA.
			
 
				+    svc.cert_path.write_bytes(b"fake cert content")
			
 
				+    svc.key_path.write_bytes(b"fake key content")
			
 
				+    # No bbl_ca.crt on disk → match fails safely.
			
 
				+    assert svc._cert_matches_current_ca() is False
			
--- a/backend/tests/unit/test_vp_delete_cleanup.py
+++ b/backend/tests/unit/test_vp_delete_cleanup.py
@@ -0,0 +1,137 @@
 
				+"""Tests for DELETE /virtual-printers/{vp_id} orphan cleanup.
			
 
				+
			
 
				+Before the fix, deleting a VP only stopped the running instance and
			
 
				+removed the row. The on-disk ``base_dir/uploads/<vp_id>/`` directory
			
 
				+lingered, and any ``PendingUpload`` rows that pointed into it remained
			
 
				+in ``pending`` status — showing up as phantom entries in
			
 
				+``/pending-uploads/``. The route now (a) marks those rows as
			
 
				+``discarded`` and (b) ``shutil.rmtree``s the upload_dir after the DB
			
 
				+commit succeeds.
			
 
				+"""
			
 
				+
			
 
				+from unittest.mock import AsyncMock, MagicMock, patch
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.api.routes.virtual_printers import delete_virtual_printer
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_delete_vp_marks_orphan_pending_uploads_discarded(tmp_path):
			
 
				+    """A VP with PendingUpload rows pointing at its upload_dir: after
			
 
				+    DELETE, those rows must be flipped to ``discarded`` and the on-disk
			
 
				+    directory must be gone."""
			
 
				+    vp_id = 77
			
 
				+    upload_dir = tmp_path / "uploads" / str(vp_id)
			
 
				+    upload_dir.mkdir(parents=True)
			
 
				+    (upload_dir / "stale.3mf").write_bytes(b"orphaned content")
			
 
				+
			
 
				+    # Build PendingUpload-like mocks. The route mutates `.status`.
			
 
				+    pending_a = MagicMock()
			
 
				+    pending_a.file_path = str(upload_dir / "stale.3mf")
			
 
				+    pending_a.status = "pending"
			
 
				+    pending_b = MagicMock()
			
 
				+    pending_b.file_path = str(upload_dir / "another.3mf")
			
 
				+    pending_b.status = "pending"
			
 
				+
			
 
				+    # Unrelated PendingUpload that does NOT belong to this VP — must
			
 
				+    # be left alone.
			
 
				+    other_pending = MagicMock()
			
 
				+    other_pending.file_path = str(tmp_path / "uploads" / "99" / "not-mine.3mf")
			
 
				+    other_pending.status = "pending"
			
 
				+
			
 
				+    # Mock VP row.
			
 
				+    vp_row = MagicMock()
			
 
				+    vp_row.id = vp_id
			
 
				+    vp_row.name = "DeleteMe"
			
 
				+
			
 
				+    # Mock DB session with the route's two .execute() calls + flush + commit.
			
 
				+    select_calls = {"i": 0}
			
 
				+
			
 
				+    async def fake_execute(query):  # noqa: ARG001
			
 
				+        """Return the VP row on the first call (vp lookup) and the
			
 
				+        in-range PendingUpload rows on the second call (orphan query).
			
 
				+        Third call is the DELETE which doesn't need a result."""
			
 
				+        select_calls["i"] += 1
			
 
				+        result = MagicMock()
			
 
				+        if select_calls["i"] == 1:
			
 
				+            result.scalar_one_or_none = MagicMock(return_value=vp_row)
			
 
				+        elif select_calls["i"] == 2:
			
 
				+            scalars = MagicMock()
			
 
				+            scalars.all = MagicMock(return_value=[pending_a, pending_b])
			
 
				+            result.scalars = MagicMock(return_value=scalars)
			
 
				+        return result
			
 
				+
			
 
				+    db = AsyncMock()
			
 
				+    db.execute = fake_execute
			
 
				+    db.flush = AsyncMock()
			
 
				+    db.commit = AsyncMock()
			
 
				+
			
 
				+    # Mock the manager: remove_instance, _base_dir, sync_from_db.
			
 
				+    fake_manager = MagicMock()
			
 
				+    fake_manager.remove_instance = AsyncMock()
			
 
				+    fake_manager.sync_from_db = AsyncMock()
			
 
				+    fake_manager._base_dir = tmp_path
			
 
				+
			
 
				+    with patch(
			
 
				+        "backend.app.services.virtual_printer.virtual_printer_manager",
			
 
				+        fake_manager,
			
 
				+    ):
			
 
				+        await delete_virtual_printer(vp_id=vp_id, db=db, _=None)
			
 
				+
			
 
				+    # Both in-range PendingUpload rows must be flipped to "discarded".
			
 
				+    assert pending_a.status == "discarded"
			
 
				+    assert pending_b.status == "discarded"
			
 
				+    # The unrelated row was never returned from the query — left alone.
			
 
				+    assert other_pending.status == "pending"
			
 
				+
			
 
				+    # The on-disk upload_dir is gone.
			
 
				+    assert not upload_dir.exists()
			
 
				+
			
 
				+    # The running instance was stopped before the row was removed.
			
 
				+    fake_manager.remove_instance.assert_awaited_once_with(vp_id)
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_delete_vp_with_no_orphan_uploads_still_succeeds(tmp_path):
			
 
				+    """A VP with no PendingUpload rows and no upload_dir on disk: the
			
 
				+    cleanup path must be a clean no-op, not raise."""
			
 
				+    vp_id = 88
			
 
				+
			
 
				+    vp_row = MagicMock()
			
 
				+    vp_row.id = vp_id
			
 
				+    vp_row.name = "EmptyDelete"
			
 
				+
			
 
				+    select_calls = {"i": 0}
			
 
				+
			
 
				+    async def fake_execute(query):  # noqa: ARG001
			
 
				+        select_calls["i"] += 1
			
 
				+        result = MagicMock()
			
 
				+        if select_calls["i"] == 1:
			
 
				+            result.scalar_one_or_none = MagicMock(return_value=vp_row)
			
 
				+        elif select_calls["i"] == 2:
			
 
				+            # No PendingUpload rows match.
			
 
				+            scalars = MagicMock()
			
 
				+            scalars.all = MagicMock(return_value=[])
			
 
				+            result.scalars = MagicMock(return_value=scalars)
			
 
				+        return result
			
 
				+
			
 
				+    db = AsyncMock()
			
 
				+    db.execute = fake_execute
			
 
				+    db.flush = AsyncMock()
			
 
				+    db.commit = AsyncMock()
			
 
				+
			
 
				+    fake_manager = MagicMock()
			
 
				+    fake_manager.remove_instance = AsyncMock()
			
 
				+    fake_manager.sync_from_db = AsyncMock()
			
 
				+    fake_manager._base_dir = tmp_path  # no uploads/<vp_id> exists
			
 
				+
			
 
				+    with patch(
			
 
				+        "backend.app.services.virtual_printer.virtual_printer_manager",
			
 
				+        fake_manager,
			
 
				+    ):
			
 
				+        await delete_virtual_printer(vp_id=vp_id, db=db, _=None)
			
 
				+
			
 
				+    fake_manager.remove_instance.assert_awaited_once_with(vp_id)
			
 
				+    # No directory to remove — and we didn't crash trying to.
			
 
				+    assert not (tmp_path / "uploads" / str(vp_id)).exists()
			
--- a/backend/tests/unit/test_vp_ftp_stor.py
+++ b/backend/tests/unit/test_vp_ftp_stor.py
@@ -0,0 +1,143 @@
 
				+"""Tests for the FTPSession.cmd_STOR streaming + size-cap behaviour.
			
 
				+
			
 
				+The original cmd_STOR buffered the entire upload in a ``list[bytes]`` and
			
 
				+called ``write_bytes`` at the end. For multi-GB ``.gcode.3mf`` files this
			
 
				+peaked at ~2× the file size in RSS (chunks held + the ``b''.join`` of
			
 
				+them) and could OOM low-memory hosts. The streaming rewrite writes each
			
 
				+chunk to disk inline (memory bounded at one chunk) and enforces
			
 
				+``MAX_UPLOAD_BYTES``. These tests pin both behaviours without standing
			
 
				+up a real TLS/FTP server.
			
 
				+"""
			
 
				+
			
 
				+import asyncio
			
 
				+import ssl
			
 
				+from unittest.mock import AsyncMock, MagicMock
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.services.virtual_printer.ftp_server import MAX_UPLOAD_BYTES, FTPSession
			
 
				+
			
 
				+
			
 
				+def _make_session(tmp_path, *, data_chunks: list[bytes]) -> FTPSession:
			
 
				+    """Build an FTPSession primed with a pre-fed StreamReader so cmd_STOR
			
 
				+    can iterate through the chunks without a real TCP connection.
			
 
				+    """
			
 
				+    control_writer = MagicMock()
			
 
				+    control_writer.write = MagicMock()
			
 
				+    control_writer.drain = AsyncMock()
			
 
				+    control_writer.get_extra_info = MagicMock(return_value=("192.168.1.99", 12345))
			
 
				+
			
 
				+    upload_dir = tmp_path / "uploads"
			
 
				+    upload_dir.mkdir(parents=True, exist_ok=True)
			
 
				+
			
 
				+    session = FTPSession(
			
 
				+        reader=asyncio.StreamReader(),
			
 
				+        writer=control_writer,
			
 
				+        upload_dir=upload_dir,
			
 
				+        access_code="deadbeef",
			
 
				+        ssl_context=ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER),
			
 
				+        on_file_received=None,
			
 
				+        bind_address="127.0.0.1",
			
 
				+        vp_name="stor-test",
			
 
				+    )
			
 
				+    session.authenticated = True
			
 
				+
			
 
				+    data_reader = asyncio.StreamReader()
			
 
				+    for chunk in data_chunks:
			
 
				+        data_reader.feed_data(chunk)
			
 
				+    data_reader.feed_eof()
			
 
				+    session._data_reader = data_reader
			
 
				+
			
 
				+    data_writer = MagicMock()
			
 
				+    data_writer.close = MagicMock()
			
 
				+    data_writer.wait_closed = AsyncMock()
			
 
				+    session._data_writer = data_writer
			
 
				+
			
 
				+    session._data_connected.set()
			
 
				+    session.data_server = None
			
 
				+
			
 
				+    return session
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_stor_writes_payload_to_disk(tmp_path):
			
 
				+    """Happy path: chunks fed to the data reader land in the upload_dir
			
 
				+    with the right content + the slicer gets 226."""
			
 
				+    payload = b"X" * (3 * 64 * 1024 + 123)  # 3 chunks + a partial one
			
 
				+    chunks = [payload[i : i + 65536] for i in range(0, len(payload), 65536)]
			
 
				+    session = _make_session(tmp_path, data_chunks=chunks)
			
 
				+    session.send = AsyncMock()
			
 
				+
			
 
				+    await session.cmd_STOR("Untitled.gcode.3mf")
			
 
				+
			
 
				+    saved = session.upload_dir / "Untitled.gcode.3mf"
			
 
				+    assert saved.exists()
			
 
				+    assert saved.stat().st_size == len(payload)
			
 
				+    assert saved.read_bytes() == payload
			
 
				+
			
 
				+    sent_codes = [args[0][0] for args in session.send.call_args_list]
			
 
				+    assert 150 in sent_codes  # "Opening data connection"
			
 
				+    assert 226 in sent_codes  # "Transfer complete"
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_stor_rejects_upload_over_max_upload_bytes(tmp_path, monkeypatch):
			
 
				+    """A single chunk taking us over the cap must abort with 426 and
			
 
				+    drop the partially-written file so it doesn't masquerade as a
			
 
				+    successful upload."""
			
 
				+    # Lower the cap to 100 KiB so the test doesn't need to allocate
			
 
				+    # 4 GiB to trigger it. The same logic governs the production cap.
			
 
				+    monkeypatch.setattr(
			
 
				+        "backend.app.services.virtual_printer.ftp_server.MAX_UPLOAD_BYTES",
			
 
				+        100 * 1024,
			
 
				+    )
			
 
				+
			
 
				+    over_cap = b"X" * (200 * 1024)  # 200 KiB > 100 KiB cap
			
 
				+    session = _make_session(tmp_path, data_chunks=[over_cap])
			
 
				+    session.send = AsyncMock()
			
 
				+
			
 
				+    await session.cmd_STOR("toobig.gcode.3mf")
			
 
				+
			
 
				+    # Partial file must be unlinked.
			
 
				+    assert not (session.upload_dir / "toobig.gcode.3mf").exists()
			
 
				+    # 426 (transfer failed) sent — not 226.
			
 
				+    sent_codes = [args[0][0] for args in session.send.call_args_list]
			
 
				+    assert 426 in sent_codes
			
 
				+    assert 226 not in sent_codes
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_stor_cleans_up_partial_file_on_read_error(tmp_path):
			
 
				+    """If the data channel raises mid-transfer (slicer RST, TLS error,
			
 
				+    timeout, …), the partial file on disk must be removed so the next
			
 
				+    upload of the same name starts clean and the user doesn't see a
			
 
				+    truncated file in the upload_dir."""
			
 
				+    payload = b"X" * 65536  # one full chunk
			
 
				+    session = _make_session(tmp_path, data_chunks=[payload])
			
 
				+    session.send = AsyncMock()
			
 
				+
			
 
				+    # Inject an OSError on the NEXT read after the first chunk.
			
 
				+    orig_read = session._data_reader.read
			
 
				+    state = {"calls": 0}
			
 
				+
			
 
				+    async def read_then_error(n):
			
 
				+        state["calls"] += 1
			
 
				+        if state["calls"] == 1:
			
 
				+            return await orig_read(n)
			
 
				+        raise OSError("simulated connection reset")
			
 
				+
			
 
				+    session._data_reader.read = read_then_error  # type: ignore[assignment]
			
 
				+
			
 
				+    await session.cmd_STOR("aborted.gcode.3mf")
			
 
				+
			
 
				+    # Partial file removed.
			
 
				+    assert not (session.upload_dir / "aborted.gcode.3mf").exists()
			
 
				+    sent_codes = [args[0][0] for args in session.send.call_args_list]
			
 
				+    assert 426 in sent_codes
			
 
				+
			
 
				+
			
 
				+def test_max_upload_bytes_is_at_least_4_gib():
			
 
				+    """The cap exists to prevent OOM, but should be high enough that
			
 
				+    legitimate multi-plate .gcode.3mf uploads (~hundreds of MB) succeed
			
 
				+    without bumping up against it. 4 GiB is the documented floor."""
			
 
				+    assert MAX_UPLOAD_BYTES >= 4 * 1024 * 1024 * 1024
			
--- a/backend/tests/unit/test_vp_mode_rename_migration.py
+++ b/backend/tests/unit/test_vp_mode_rename_migration.py
@@ -0,0 +1,151 @@
 
				+"""Regression test for the VP mode wire-value rename migration (#1429 follow-up).
			
 
				+
			
 
				+The UI buttons "Archive" and "Queue" had always saved the wire values
			
 
				+`immediate` and `print_queue` — confusing in every support bundle. The
			
 
				+rename migration in ``run_migrations`` rewrites existing rows to the
			
 
				+canonical names. This test verifies it on both fresh and legacy schemas
			
 
				+and confirms it's idempotent so reruns are safe (boot-on-boot).
			
 
				+"""
			
 
				+
			
 
				+from __future__ import annotations
			
 
				+
			
 
				+import pytest
			
 
				+from sqlalchemy import text
			
 
				+from sqlalchemy.ext.asyncio import create_async_engine
			
 
				+
			
 
				+from backend.app.core.database import run_migrations
			
 
				+
			
 
				+
			
 
				+@pytest.fixture(autouse=True)
			
 
				+def force_sqlite_dialect(monkeypatch):
			
 
				+    """Force the SQLite branch regardless of test env settings."""
			
 
				+    from backend.app.core import db_dialect
			
 
				+
			
 
				+    monkeypatch.setattr(db_dialect, "is_sqlite", lambda: True)
			
 
				+    monkeypatch.setattr(db_dialect, "is_postgres", lambda: False)
			
 
				+    from backend.app.core import database as database_module
			
 
				+
			
 
				+    monkeypatch.setattr(database_module, "is_sqlite", lambda: True)
			
 
				+
			
 
				+
			
 
				+def _register_all_models():
			
 
				+    """run_migrations touches multiple tables; the full schema must exist."""
			
 
				+    from backend.app.models import (  # noqa: F401
			
 
				+        ams_history,
			
 
				+        ams_label,
			
 
				+        api_key,
			
 
				+        archive,
			
 
				+        color_catalog,
			
 
				+        external_link,
			
 
				+        filament,
			
 
				+        group,
			
 
				+        kprofile_note,
			
 
				+        maintenance,
			
 
				+        notification,
			
 
				+        notification_template,
			
 
				+        print_log,
			
 
				+        print_queue,
			
 
				+        printer,
			
 
				+        project,
			
 
				+        project_bom,
			
 
				+        settings,
			
 
				+        slot_preset,
			
 
				+        smart_plug,
			
 
				+        smart_plug_energy_snapshot,
			
 
				+        spool,
			
 
				+        spool_assignment,
			
 
				+        spool_catalog,
			
 
				+        spool_k_profile,
			
 
				+        spool_usage_history,
			
 
				+        spoolbuddy_device,
			
 
				+        user,
			
 
				+        user_email_pref,
			
 
				+        virtual_printer,
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+@pytest.fixture
			
 
				+async def engine():
			
 
				+    from backend.app.core.database import Base
			
 
				+
			
 
				+    _register_all_models()
			
 
				+
			
 
				+    eng = create_async_engine("sqlite+aiosqlite:///:memory:", echo=False)
			
 
				+    async with eng.begin() as conn:
			
 
				+        await conn.run_sync(Base.metadata.create_all)
			
 
				+    yield eng
			
 
				+    await eng.dispose()
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_legacy_mode_rows_get_canonical_names(engine):
			
 
				+    """Existing rows with `immediate` / `print_queue` get rewritten to
			
 
				+    `archive` / `queue` while canonical values and unrelated modes pass
			
 
				+    through untouched."""
			
 
				+    async with engine.begin() as conn:
			
 
				+        await conn.execute(
			
 
				+            text(
			
 
				+                "INSERT INTO virtual_printers (id, name, enabled, mode, serial_suffix, position) VALUES "
			
 
				+                "(1, 'A', 0, 'immediate', '391800001', 1),"
			
 
				+                "(2, 'B', 0, 'print_queue', '391800002', 2),"
			
 
				+                "(3, 'C', 0, 'review', '391800003', 3),"
			
 
				+                "(4, 'D', 0, 'proxy', '391800004', 4),"
			
 
				+                "(5, 'E', 0, 'archive', '391800005', 5),"
			
 
				+                "(6, 'F', 0, 'queue', '391800006', 6)"
			
 
				+            )
			
 
				+        )
			
 
				+
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+
			
 
				+    async with engine.connect() as conn:
			
 
				+        result = await conn.execute(text("SELECT id, mode FROM virtual_printers ORDER BY id"))
			
 
				+        rows = dict(result.fetchall())
			
 
				+
			
 
				+    assert rows[1] == "archive"  # immediate → archive
			
 
				+    assert rows[2] == "queue"  # print_queue → queue
			
 
				+    assert rows[3] == "review"  # untouched
			
 
				+    assert rows[4] == "proxy"  # untouched
			
 
				+    assert rows[5] == "archive"  # already canonical
			
 
				+    assert rows[6] == "queue"  # already canonical
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_legacy_settings_row_gets_canonical_name(engine):
			
 
				+    """The legacy single-VP `virtual_printer_mode` setting also gets renamed
			
 
				+    so the GET response (which feeds the support bundle and the settings
			
 
				+    page) reads the canonical name."""
			
 
				+    async with engine.begin() as conn:
			
 
				+        await conn.execute(text("INSERT INTO settings (key, value) VALUES ('virtual_printer_mode', 'immediate')"))
			
 
				+
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+
			
 
				+    async with engine.connect() as conn:
			
 
				+        result = await conn.execute(text("SELECT value FROM settings WHERE key = 'virtual_printer_mode'"))
			
 
				+        value = result.scalar()
			
 
				+
			
 
				+    assert value == "archive"
			
 
				+
			
 
				+
			
 
				+@pytest.mark.asyncio
			
 
				+async def test_migration_is_idempotent(engine):
			
 
				+    """Running the migration twice must be a no-op on canonical values —
			
 
				+    every boot re-runs the migration set."""
			
 
				+    async with engine.begin() as conn:
			
 
				+        await conn.execute(
			
 
				+            text(
			
 
				+                "INSERT INTO virtual_printers (id, name, enabled, mode, serial_suffix, position) "
			
 
				+                "VALUES (1, 'A', 0, 'immediate', '391800001', 1)"
			
 
				+            )
			
 
				+        )
			
 
				+
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+    # Second run on already-canonical values.
			
 
				+    async with engine.begin() as conn:
			
 
				+        await run_migrations(conn)
			
 
				+
			
 
				+    async with engine.connect() as conn:
			
 
				+        result = await conn.execute(text("SELECT mode FROM virtual_printers WHERE id = 1"))
			
 
				+        assert result.scalar() == "archive"
			
--- a/backend/tests/unit/test_vp_mqtt_bridge.py
+++ b/backend/tests/unit/test_vp_mqtt_bridge.py
@@ -7,7 +7,11 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
				 
			
 
				 import pytest
			
 
				 
			
 
				-from backend.app.services.virtual_printer.mqtt_bridge import MQTTBridge, _ip_to_uint32_le
			
 
				+from backend.app.services.virtual_printer.mqtt_bridge import (
			
 
				+    MQTTBridge,
			
 
				+    _ip_to_uint32_le,
			
 
				+    _resolve_host_interface_for_target,
			
 
				+)
			
 
				 from backend.app.services.virtual_printer.mqtt_server import SimpleMQTTServer
			
 
				 
			
 
				 H2D_SERIAL = "0948BB540200427"
			
@@ -220,6 +224,95 @@ class TestPushStatusCache:
 
				 
			
 
				         await bridge.stop()
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_net_info_ip_rewritten_for_unknown_secondary_interface(self):
			
 
				+        """Regression for #1429: real printers (X1C / H2D Pro) report multiple
			
 
				+        active interfaces (WiFi + Ethernet) — only ONE matches the IP Bambuddy
			
 
				+        tracks. The rewrite must catch every non-zero entry, not just the one
			
 
				+        whose IP equals `_target_ip_uint32_le`, or the slicer's FTP fallback
			
 
				+        path leaks straight to the real printer."""
			
 
				+        server = _make_server(bind_address=VP_IP)
			
 
				+        bridge = _make_bridge(server)
			
 
				+        await bridge.start()
			
 
				+
			
 
				+        h2d_le = _ip_to_uint32_le(H2D_IP)
			
 
				+        # A second IP Bambuddy never saw (e.g. printer's ethernet interface
			
 
				+        # while Bambuddy talks over wifi).
			
 
				+        other_le = _ip_to_uint32_le("192.168.99.42")
			
 
				+        vp_le = _ip_to_uint32_le(VP_IP)
			
 
				+        payload = json.dumps(
			
 
				+            {
			
 
				+                "print": {
			
 
				+                    "command": "push_status",
			
 
				+                    "net": {
			
 
				+                        "info": [
			
 
				+                            {"ip": h2d_le, "mask": 0xFFFFFF},
			
 
				+                            {"ip": other_le, "mask": 0xFFFFFF},
			
 
				+                            {"ip": 0, "mask": 0},
			
 
				+                        ]
			
 
				+                    },
			
 
				+                }
			
 
				+            }
			
 
				+        ).encode()
			
 
				+        bridge._on_printer_raw(f"device/{H2D_SERIAL}/report", payload)
			
 
				+        await asyncio.sleep(0.01)
			
 
				+
			
 
				+        cached = bridge.get_latest_print_state()
			
 
				+        assert cached["net"]["info"][0]["ip"] == vp_le
			
 
				+        assert cached["net"]["info"][1]["ip"] == vp_le  # secondary interface also rewritten
			
 
				+        assert cached["net"]["info"][2]["ip"] == 0  # placeholder untouched
			
 
				+
			
 
				+        await bridge.stop()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_late_arriving_printer_ip_rewrites_existing_cache(self):
			
 
				+        """Regression for #1429: if the printer's `ip_address` is empty at
			
 
				+        first bind (DB row stale, or the client object exists before the
			
 
				+        first SSDP refresh fills it in), the rewrite stays disabled and the
			
 
				+        first cached push poisons the cache with the real-printer IP.
			
 
				+        Once `ip_address` becomes valid, the next refresh tick must (a) arm
			
 
				+        the encoding and (b) sweep the cached `net.info[].ip` so the slicer
			
 
				+        sees the rewritten value on its next pull. Without the sweep the
			
 
				+        sticky-key preservation keeps the poisoned value alive across
			
 
				+        every subsequent incremental push."""
			
 
				+        server = _make_server(bind_address=VP_IP)
			
 
				+        # Bind to a client whose ip_address is empty at start — simulates the
			
 
				+        # late-arrival path.
			
 
				+        target = _make_paho_client(ip="")
			
 
				+        bridge = _make_bridge(server, target)
			
 
				+        await bridge.start()
			
 
				+        assert bridge._target_ip_uint32_le is None  # not yet armed
			
 
				+
			
 
				+        h2d_le = _ip_to_uint32_le(H2D_IP)
			
 
				+        vp_le = _ip_to_uint32_le(VP_IP)
			
 
				+        payload = json.dumps(
			
 
				+            {
			
 
				+                "print": {
			
 
				+                    "command": "push_status",
			
 
				+                    "net": {"info": [{"ip": h2d_le, "mask": 0xFFFFFF}]},
			
 
				+                }
			
 
				+            }
			
 
				+        ).encode()
			
 
				+        bridge._on_printer_raw(f"device/{H2D_SERIAL}/report", payload)
			
 
				+        await asyncio.sleep(0.01)
			
 
				+
			
 
				+        # First push landed before encoding was armed → cache holds real IP.
			
 
				+        cached = bridge.get_latest_print_state()
			
 
				+        assert cached["net"]["info"][0]["ip"] == h2d_le
			
 
				+
			
 
				+        # Printer's IP becomes known. Next refresh tick must self-heal.
			
 
				+        target.ip_address = H2D_IP
			
 
				+        bridge._resolve_client()
			
 
				+
			
 
				+        cached = bridge.get_latest_print_state()
			
 
				+        assert cached["net"]["info"][0]["ip"] == vp_le, (
			
 
				+            "cache must be swept once encoding becomes valid; sticky-key "
			
 
				+            "preservation would otherwise keep the poisoned IP forever"
			
 
				+        )
			
 
				+        assert bridge._target_ip_uint32_le == h2d_le
			
 
				+
			
 
				+        await bridge.stop()
			
 
				+
			
 
				     @pytest.mark.asyncio
			
 
				     async def test_request_topic_message_is_ignored(self):
			
 
				         server = _make_server()
			
@@ -774,6 +867,48 @@ class TestStatusReportCachedAsBase:
 
				         assert payload["print"]["gcode_state"] == "PREPARE"
			
 
				         assert payload["print"]["gcode_file"] == "foo.3mf"
			
 
				 
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_live_progress_fields_zeroed_in_cached_branch(self):
			
 
				+        """#1558: when the real target printer is mid-print, the cached
			
 
				+        push_status carries live values for mc_percent / stg_cur / layer_num /
			
 
				+        etc. BambuStudio's Send pre-flight reads any of these as "VP busy"
			
 
				+        even when gcode_state above is forced to IDLE — blocking Send while
			
 
				+        the target prints. The cached branch must override these to the same
			
 
				+        idle values the synthetic stub uses.
			
 
				+        """
			
 
				+        server = _make_server()
			
 
				+        bridge = MagicMock()
			
 
				+        # Real printer mid-print state: gcode_state may be RUNNING upstream,
			
 
				+        # but the VP's own _gcode_state is IDLE (Send is requesting a
			
 
				+        # new upload, the VP isn't running anything).
			
 
				+        bridge.get_latest_print_state.return_value = {
			
 
				+            "command": "push_status",
			
 
				+            "msg": 0,
			
 
				+            "gcode_state": "RUNNING",
			
 
				+            "mc_print_stage": "2",
			
 
				+            "mc_percent": 47,
			
 
				+            "mc_remaining_time": 3600,
			
 
				+            "stg": [1, 2, 3],
			
 
				+            "stg_cur": 14,
			
 
				+            "layer_num": 120,
			
 
				+            "total_layer_num": 250,
			
 
				+            "print_error": 0,
			
 
				+        }
			
 
				+        server.set_bridge(bridge)
			
 
				+        published = self._capture_published(server)
			
 
				+
			
 
				+        await server._send_status_report(MagicMock())
			
 
				+        _serial, payload = published[0]
			
 
				+        # Every live-progress field must reflect "idle / VP isn't busy".
			
 
				+        assert payload["print"]["mc_print_stage"] == ""
			
 
				+        assert payload["print"]["mc_percent"] == 0
			
 
				+        assert payload["print"]["mc_remaining_time"] == 0
			
 
				+        assert payload["print"]["stg"] == []
			
 
				+        assert payload["print"]["stg_cur"] == 0
			
 
				+        assert payload["print"]["layer_num"] == 0
			
 
				+        assert payload["print"]["total_layer_num"] == 0
			
 
				+        assert payload["print"]["print_error"] == 0
			
 
				+
			
 
				 
			
 
				 # ---------------------------------------------------------------------------
			
 
				 # Wire format
			
@@ -950,3 +1085,102 @@ class TestIpEncoding:
 
				     def test_invalid_ip_raises(self):
			
 
				         with pytest.raises(ValueError):
			
 
				             _ip_to_uint32_le("not.an.ip.actually")
			
 
				+
			
 
				+
			
 
				+# ---------------------------------------------------------------------------
			
 
				+# Auto-resolve fallback for default-config (bind_address = "0.0.0.0")
			
 
				+# ---------------------------------------------------------------------------
			
 
				+
			
 
				+
			
 
				+class TestBindAddressAutoResolve:
			
 
				+    """#1429 residual: VPs created without a dedicated bind IP run on
			
 
				+    `bind_address=0.0.0.0`. The original fix's `_refresh_ip_encoding`
			
 
				+    early-returned on 0.0.0.0, so the rewrite never armed and `net.info[].ip`
			
 
				+    kept leaking the real printer IP. Now the bridge auto-resolves a host
			
 
				+    interface in the printer's subnet and uses that as the VP IP."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_rewrite_arms_via_auto_resolved_host_ip(self):
			
 
				+        """When bind_address is 0.0.0.0, fall back to the host interface in
			
 
				+        the target printer's subnet and rewrite to that IP."""
			
 
				+        server = _make_server(bind_address="0.0.0.0")  # nosec B104
			
 
				+        bridge = _make_bridge(server)
			
 
				+        with patch(
			
 
				+            "backend.app.services.virtual_printer.mqtt_bridge._resolve_host_interface_for_target",
			
 
				+            return_value=VP_IP,
			
 
				+        ):
			
 
				+            await bridge.start()
			
 
				+
			
 
				+            h2d_le = _ip_to_uint32_le(H2D_IP)
			
 
				+            vp_le = _ip_to_uint32_le(VP_IP)
			
 
				+            payload = json.dumps(
			
 
				+                {
			
 
				+                    "print": {
			
 
				+                        "command": "push_status",
			
 
				+                        "net": {"info": [{"ip": h2d_le, "mask": 0xFFFFFF}]},
			
 
				+                    }
			
 
				+                }
			
 
				+            ).encode()
			
 
				+            bridge._on_printer_raw(f"device/{H2D_SERIAL}/report", payload)
			
 
				+            await asyncio.sleep(0.01)
			
 
				+
			
 
				+            cached = bridge.get_latest_print_state()
			
 
				+            assert cached["net"]["info"][0]["ip"] == vp_le
			
 
				+            assert bridge._vp_ip_uint32_le == vp_le
			
 
				+
			
 
				+            await bridge.stop()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_rewrite_disabled_when_no_matching_host_interface(self):
			
 
				+        """If no host interface shares a subnet with the printer, the bridge
			
 
				+        cannot pick a sensible VP IP — leave encoding unarmed and let the
			
 
				+        push through unrewritten (no crash, no wrong rewrite)."""
			
 
				+        server = _make_server(bind_address="")
			
 
				+        bridge = _make_bridge(server)
			
 
				+        with patch(
			
 
				+            "backend.app.services.virtual_printer.mqtt_bridge._resolve_host_interface_for_target",
			
 
				+            return_value=None,
			
 
				+        ):
			
 
				+            await bridge.start()
			
 
				+
			
 
				+            h2d_le = _ip_to_uint32_le(H2D_IP)
			
 
				+            payload = json.dumps(
			
 
				+                {
			
 
				+                    "print": {
			
 
				+                        "command": "push_status",
			
 
				+                        "net": {"info": [{"ip": h2d_le, "mask": 0xFFFFFF}]},
			
 
				+                    }
			
 
				+                }
			
 
				+            ).encode()
			
 
				+            bridge._on_printer_raw(f"device/{H2D_SERIAL}/report", payload)
			
 
				+            await asyncio.sleep(0.01)
			
 
				+
			
 
				+            assert bridge._vp_ip_uint32_le is None
			
 
				+            assert bridge._target_ip_uint32_le is None
			
 
				+
			
 
				+            await bridge.stop()
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_explicit_bind_ip_takes_precedence_over_auto_resolve(self):
			
 
				+        """Auto-resolve only kicks in when bind_address is empty/0.0.0.0; an
			
 
				+        explicitly-set bind IP must be used verbatim even if there's also a
			
 
				+        same-subnet host interface."""
			
 
				+        server = _make_server(bind_address=VP_IP)
			
 
				+        bridge = _make_bridge(server)
			
 
				+        # Auto-resolver would have returned a DIFFERENT IP — we must not use it.
			
 
				+        with patch(
			
 
				+            "backend.app.services.virtual_printer.mqtt_bridge._resolve_host_interface_for_target",
			
 
				+            return_value="10.99.99.99",
			
 
				+        ):
			
 
				+            await bridge.start()
			
 
				+            assert bridge._vp_ip_uint32_le == _ip_to_uint32_le(VP_IP)
			
 
				+            await bridge.stop()
			
 
				+
			
 
				+    def test_resolve_helper_returns_none_for_unreachable_target(self):
			
 
				+        """The helper itself must be defensive — if `find_interface_for_ip`
			
 
				+        raises or returns None, we get None (no crash)."""
			
 
				+        with patch(
			
 
				+            "backend.app.services.network_utils.find_interface_for_ip",
			
 
				+            return_value=None,
			
 
				+        ):
			
 
				+            assert _resolve_host_interface_for_target("203.0.113.1") is None
			
--- a/backend/tests/unit/test_vp_mqtt_server.py
+++ b/backend/tests/unit/test_vp_mqtt_server.py
@@ -186,3 +186,375 @@ class TestClientSerialLifecycle:
 
				         # stop() is async but we only need to cover the clear() path; run a minimal version
			
 
				         asyncio.run(server.stop())
			
 
				         assert server._client_serials == {}
			
 
				+
			
 
				+
			
 
				+def _build_connect_payload(
			
 
				+    keep_alive: int,
			
 
				+    access_code: str = "deadbeef",
			
 
				+    username: str = "bblp",
			
 
				+    client_id: str = "orca",
			
 
				+) -> bytes:
			
 
				+    """Build an MQTT CONNECT variable-header + payload (without the fixed header).
			
 
				+
			
 
				+    Layout matches the parser in `_handle_connect`:
			
 
				+    proto_name_len(2) + "MQTT"(4) + level(1) + flags(1) + keepalive(2) +
			
 
				+    client_id_len(2) + client_id + username_len(2) + username +
			
 
				+    password_len(2) + password.
			
 
				+    """
			
 
				+    proto = b"MQTT"
			
 
				+    parts = bytearray()
			
 
				+    parts += len(proto).to_bytes(2, "big") + proto
			
 
				+    parts += bytes([0x04, 0xC2])  # protocol level 4 (MQTT 3.1.1), flags: user+pass+clean
			
 
				+    parts += keep_alive.to_bytes(2, "big")
			
 
				+    cid = client_id.encode("utf-8")
			
 
				+    parts += len(cid).to_bytes(2, "big") + cid
			
 
				+    user = username.encode("utf-8")
			
 
				+    parts += len(user).to_bytes(2, "big") + user
			
 
				+    pw = access_code.encode("utf-8")
			
 
				+    parts += len(pw).to_bytes(2, "big") + pw
			
 
				+    return bytes(parts)
			
 
				+
			
 
				+
			
 
				+class TestHandleConnectKeepalive:
			
 
				+    """`_handle_connect` must return the negotiated keepalive (#1548).
			
 
				+
			
 
				+    Pre-fix, the parser ignored this field and the read loop fell back to
			
 
				+    a hardcoded 60 s timeout, closing OrcaSlicer's idle MQTT connection
			
 
				+    after exactly 60 s instead of waiting 1.5× the client-negotiated
			
 
				+    keepalive as MQTT spec §4.4 requires.
			
 
				+    """
			
 
				+
			
 
				+    def test_returns_negotiated_keepalive_on_auth_success(self):
			
 
				+        server = _make_server()
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        # Also stub status-report writes triggered post-auth
			
 
				+        payload = _build_connect_payload(keep_alive=120)
			
 
				+
			
 
				+        result = asyncio.run(server._handle_connect(payload, writer))
			
 
				+
			
 
				+        assert result == (True, 120)
			
 
				+
			
 
				+    def test_returns_zero_keepalive_for_no_keepalive_clients(self):
			
 
				+        """`keep_alive == 0` in CONNECT means the client opted out per spec
			
 
				+        §3.1.2.10 — server must report it back so the read loop can drop
			
 
				+        the timeout entirely."""
			
 
				+        server = _make_server()
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        payload = _build_connect_payload(keep_alive=0)
			
 
				+
			
 
				+        result = asyncio.run(server._handle_connect(payload, writer))
			
 
				+
			
 
				+        assert result == (True, 0)
			
 
				+
			
 
				+    def test_returns_false_with_zero_keepalive_on_auth_failure(self):
			
 
				+        """Bad password path still returns the tuple shape so the caller's
			
 
				+        unpack doesn't break."""
			
 
				+        server = _make_server()
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        payload = _build_connect_payload(keep_alive=60, access_code="wrong")
			
 
				+
			
 
				+        result = asyncio.run(server._handle_connect(payload, writer))
			
 
				+
			
 
				+        assert result == (False, 0)
			
 
				+
			
 
				+    def test_returns_false_with_zero_keepalive_on_parse_error(self):
			
 
				+        """Malformed CONNECT (e.g. truncated) must not crash and must
			
 
				+        still hand a tuple back to the caller."""
			
 
				+        server = _make_server()
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        # 3 bytes is far shorter than even the protocol-name prefix needs.
			
 
				+        result = asyncio.run(server._handle_connect(b"\x00\x04MQ", writer))
			
 
				+
			
 
				+        assert result == (False, 0)
			
 
				+
			
 
				+
			
 
				+class TestHandleClientHonoursKeepalive:
			
 
				+    """`_handle_client` must use the client-negotiated keepalive for its
			
 
				+    read-loop timeout, not the hardcoded 60 s default (#1548)."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_idle_client_kept_alive_beyond_60s_when_keepalive_is_long(self):
			
 
				+        """The literal #1548 repro: a client negotiates keepalive=180 and
			
 
				+        then sits idle. Pre-fix the read loop closed the connection after
			
 
				+        60 s (hardcoded). Post-fix the timeout is 1.5×180=270 s — so the
			
 
				+        connection is still open after the original 60 s boundary."""
			
 
				+        server = _make_server()
			
 
				+        server._running = True
			
 
				+
			
 
				+        reader = asyncio.StreamReader()
			
 
				+        # Feed CONNECT (with fixed header byte 0x10 + remaining length)
			
 
				+        connect_payload = _build_connect_payload(keep_alive=180)
			
 
				+        rl = len(connect_payload)
			
 
				+        # MQTT remaining-length encoding for values <128 is a single byte.
			
 
				+        assert rl < 128
			
 
				+        reader.feed_data(bytes([0x10, rl]) + connect_payload)
			
 
				+        # No further data — client goes idle.
			
 
				+
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        writer.close = MagicMock()
			
 
				+        writer.wait_closed = AsyncMock()
			
 
				+        writer.get_extra_info = MagicMock(return_value=("1.2.3.4", 12345))
			
 
				+
			
 
				+        # Patch the post-auth status-report send so the handler doesn't
			
 
				+        # depend on a real serial/payload path.
			
 
				+        server._send_status_report = AsyncMock()
			
 
				+
			
 
				+        task = asyncio.create_task(server._handle_client(reader, writer))
			
 
				+
			
 
				+        # Wait past the old hardcoded 60 s threshold by a margin. Real-time
			
 
				+        # 60 s would be far too slow for a unit test — drive simulated time
			
 
				+        # by yielding repeatedly. asyncio.wait_for with a real wall-clock
			
 
				+        # delay would actually consume 60 s of test time, so instead we
			
 
				+        # patch the timeout to a small value and assert the timeout chosen
			
 
				+        # by the loop matches our expectation.
			
 
				+        # Approach: let the task progress past the CONNECT, then cancel.
			
 
				+        await asyncio.sleep(0.1)  # give the loop a chance to process CONNECT
			
 
				+        # The post-auth read should now be waiting on reader with the
			
 
				+        # negotiated keepalive. We can't observe the timeout directly, so
			
 
				+        # we just verify the connection wasn't closed by inspecting close().
			
 
				+        assert not writer.close.called, "connection should still be open after CONNECT"
			
 
				+        # Cancel cleanly
			
 
				+        task.cancel()
			
 
				+        try:
			
 
				+            await task
			
 
				+        except asyncio.CancelledError:
			
 
				+            pass
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_idle_client_closed_after_one_and_a_half_times_keepalive(self):
			
 
				+        """Tight verification: keepalive=2 must close the connection in
			
 
				+        ~3 s (1.5×) of idle, well above the noise floor for an async test."""
			
 
				+        server = _make_server()
			
 
				+        server._running = True
			
 
				+
			
 
				+        reader = asyncio.StreamReader()
			
 
				+        connect_payload = _build_connect_payload(keep_alive=2)
			
 
				+        rl = len(connect_payload)
			
 
				+        assert rl < 128
			
 
				+        reader.feed_data(bytes([0x10, rl]) + connect_payload)
			
 
				+
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        writer.close = MagicMock()
			
 
				+        writer.wait_closed = AsyncMock()
			
 
				+        writer.get_extra_info = MagicMock(return_value=("1.2.3.4", 12345))
			
 
				+        server._send_status_report = AsyncMock()
			
 
				+
			
 
				+        start = asyncio.get_event_loop().time()
			
 
				+        await server._handle_client(reader, writer)
			
 
				+        elapsed = asyncio.get_event_loop().time() - start
			
 
				+
			
 
				+        # 1.5×2s = 3s expected. Allow ±1s slop for the read of CONNECT
			
 
				+        # itself + scheduler jitter on a loaded CI box.
			
 
				+        assert 2.0 < elapsed < 4.5, f"expected ~3s timeout, got {elapsed:.2f}s"
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_pingreq_resets_idle_timeout(self):
			
 
				+        """A PINGREQ within the keepalive window must keep the connection
			
 
				+        open — the per-packet read timeout is restarted on every byte
			
 
				+        delivered, so the next idle window is measured from the PINGREQ."""
			
 
				+        server = _make_server()
			
 
				+        server._running = True
			
 
				+
			
 
				+        reader = asyncio.StreamReader()
			
 
				+        connect_payload = _build_connect_payload(keep_alive=2)
			
 
				+        rl = len(connect_payload)
			
 
				+        assert rl < 128
			
 
				+        reader.feed_data(bytes([0x10, rl]) + connect_payload)
			
 
				+
			
 
				+        writer = MagicMock()
			
 
				+        writer.write = MagicMock()
			
 
				+        writer.drain = AsyncMock()
			
 
				+        writer.close = MagicMock()
			
 
				+        writer.wait_closed = AsyncMock()
			
 
				+        writer.get_extra_info = MagicMock(return_value=("1.2.3.4", 12345))
			
 
				+        server._send_status_report = AsyncMock()
			
 
				+
			
 
				+        async def _drive():
			
 
				+            # Feed a PINGREQ (0xC0 0x00 — type 12 with zero remaining length)
			
 
				+            # at 2s, which is 1s *before* the would-be timeout, and a
			
 
				+            # DISCONNECT at 2.5s so the test exits deterministically.
			
 
				+            await asyncio.sleep(2.0)
			
 
				+            reader.feed_data(bytes([0xC0, 0x00]))
			
 
				+            await asyncio.sleep(0.5)
			
 
				+            reader.feed_data(bytes([0xE0, 0x00]))  # DISCONNECT
			
 
				+
			
 
				+        driver = asyncio.create_task(_drive())
			
 
				+        start = asyncio.get_event_loop().time()
			
 
				+        await server._handle_client(reader, writer)
			
 
				+        elapsed = asyncio.get_event_loop().time() - start
			
 
				+        await driver  # ensure no orphan task
			
 
				+
			
 
				+        # Exit was via DISCONNECT at ~2.5s, NOT a 3s keepalive timeout.
			
 
				+        # Allow generous slop.
			
 
				+        assert 2.0 < elapsed < 3.0, f"expected exit on DISCONNECT near 2.5s, got {elapsed:.2f}s"
			
 
				+
			
 
				+
			
 
				+class TestAuthRateLimit:
			
 
				+    """Per-IP rate-limiting of MQTT CONNECT auth attempts.
			
 
				+
			
 
				+    Bambuddy's VP exposes an 8-char access code via the slicer-facing MQTT
			
 
				+    server. Without a rate-limit the code is brute-forceable by anyone who
			
 
				+    can reach the VP's bind IP (LAN or VPN). The limiter records each
			
 
				+    failed auth attempt per source IP and rejects further CONNECTs from
			
 
				+    that IP once the per-window threshold is crossed, then auto-recovers
			
 
				+    when the window expires. Verified here against the production
			
 
				+    constants imported from the module.
			
 
				+    """
			
 
				+
			
 
				+    @pytest.fixture
			
 
				+    def server(self):
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import SimpleMQTTServer
			
 
				+
			
 
				+        return _make_server(serial="01P00A391800002")
			
 
				+
			
 
				+    def test_under_limit_attempts_are_allowed(self, server):
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import _AUTH_RATE_LIMIT_MAX_ATTEMPTS
			
 
				+
			
 
				+        ip = "192.168.1.50"
			
 
				+        # Record (max-1) failures and verify the next attempt is still allowed.
			
 
				+        for _ in range(_AUTH_RATE_LIMIT_MAX_ATTEMPTS - 1):
			
 
				+            server._record_auth_failure(ip)
			
 
				+        assert server._is_auth_rate_limited(ip) is False
			
 
				+
			
 
				+    def test_exactly_max_attempts_triggers_rate_limit(self, server):
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import _AUTH_RATE_LIMIT_MAX_ATTEMPTS
			
 
				+
			
 
				+        ip = "192.168.1.50"
			
 
				+        for _ in range(_AUTH_RATE_LIMIT_MAX_ATTEMPTS):
			
 
				+            server._record_auth_failure(ip)
			
 
				+        # At exactly the cap, further attempts must be rejected.
			
 
				+        assert server._is_auth_rate_limited(ip) is True
			
 
				+
			
 
				+    def test_window_recovery_clears_old_failures(self, server):
			
 
				+        """A burst of failures older than the window must NOT count
			
 
				+        against the IP — the limiter is sliding, not cumulative."""
			
 
				+        import time as _time
			
 
				+
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import (
			
 
				+            _AUTH_RATE_LIMIT_MAX_ATTEMPTS,
			
 
				+            _AUTH_RATE_LIMIT_WINDOW_SECONDS,
			
 
				+        )
			
 
				+
			
 
				+        ip = "192.168.1.50"
			
 
				+        # Inject stale timestamps directly — older than the window means the
			
 
				+        # limiter should drop them on the next probe.
			
 
				+        stale = _time.monotonic() - _AUTH_RATE_LIMIT_WINDOW_SECONDS - 1.0
			
 
				+        server._auth_failures[ip] = [stale] * _AUTH_RATE_LIMIT_MAX_ATTEMPTS
			
 
				+        # All recorded failures are outside the window — IP is no longer rate-limited.
			
 
				+        assert server._is_auth_rate_limited(ip) is False
			
 
				+        # And the dict entry was pruned (empty) instead of leaking forever.
			
 
				+        assert ip not in server._auth_failures
			
 
				+
			
 
				+    def test_multiple_ips_tracked_independently(self, server):
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import _AUTH_RATE_LIMIT_MAX_ATTEMPTS
			
 
				+
			
 
				+        # One IP exhausts the budget; another IP must still be allowed.
			
 
				+        for _ in range(_AUTH_RATE_LIMIT_MAX_ATTEMPTS):
			
 
				+            server._record_auth_failure("10.0.0.1")
			
 
				+        assert server._is_auth_rate_limited("10.0.0.1") is True
			
 
				+        assert server._is_auth_rate_limited("10.0.0.2") is False
			
 
				+
			
 
				+    def test_successful_auth_clears_failure_history(self, server):
			
 
				+        """A successful auth must wipe the IP's prior-failures stash so the
			
 
				+        user isn't penalised for typos that they ultimately corrected."""
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import _AUTH_RATE_LIMIT_MAX_ATTEMPTS
			
 
				+
			
 
				+        ip = "192.168.1.50"
			
 
				+        # Build up failures one short of the cap.
			
 
				+        for _ in range(_AUTH_RATE_LIMIT_MAX_ATTEMPTS - 1):
			
 
				+            server._record_auth_failure(ip)
			
 
				+        # Successful auth must clear them.
			
 
				+        server._clear_auth_failures(ip)
			
 
				+        # Now a subsequent failure starts the count over at 1 (well under cap).
			
 
				+        server._record_auth_failure(ip)
			
 
				+        assert server._is_auth_rate_limited(ip) is False
			
 
				+
			
 
				+
			
 
				+class TestPendingRequestRouting:
			
 
				+    """`push_raw_to_clients` routes the printer's response back only to the
			
 
				+    slicer that originated the request, not to every connected slicer.
			
 
				+
			
 
				+    The bridge calls `push_raw_to_clients(topic, payload)` for every
			
 
				+    response it sees from the real printer. Before the fix, this fanned
			
 
				+    out to every connected slicer — leaking slicer A's
			
 
				+    `extrusion_cali_get` response into slicer B's command stream. The
			
 
				+    fix records `sequence_id → client_id` on the way out and looks it
			
 
				+    back up on the way in.
			
 
				+    """
			
 
				+
			
 
				+    @pytest.fixture
			
 
				+    def server(self):
			
 
				+        return _make_server(serial="01P00A391800003")
			
 
				+
			
 
				+    def test_single_slicer_routes_to_that_slicer(self, server):
			
 
				+        """Sanity check: when one slicer is connected, the response goes
			
 
				+        to it regardless of whether the seq_id was recorded."""
			
 
				+        # No recorded request, no slicer seen → returns None (broadcast).
			
 
				+        assert server._lookup_pending_request_client(b'{"print": {"sequence_id": "999"}}') is None
			
 
				+
			
 
				+    def test_record_pending_request_walks_nested_blocks(self, server):
			
 
				+        """The slicer wraps its sequence_id under whichever subsystem the
			
 
				+        command targets (`print`, `info`, `system`, …). The helper must
			
 
				+        find it regardless of which key it's nested under."""
			
 
				+        server._record_pending_request(
			
 
				+            {"print": {"command": "extrusion_cali_get", "sequence_id": "42"}},
			
 
				+            "clientA",
			
 
				+        )
			
 
				+        assert server._pending_requests.get("42") == "clientA"
			
 
				+
			
 
				+        server._record_pending_request(
			
 
				+            {"info": {"command": "get_version", "sequence_id": "43"}},
			
 
				+            "clientB",
			
 
				+        )
			
 
				+        assert server._pending_requests.get("43") == "clientB"
			
 
				+
			
 
				+    def test_lookup_pops_entry_so_each_response_routes_once(self, server):
			
 
				+        """Once a response is matched, the pending entry is consumed so
			
 
				+        a later coincidental sequence_id from a printer-initiated push
			
 
				+        doesn't mis-route to the original client."""
			
 
				+        server._record_pending_request({"print": {"sequence_id": "100"}}, "clientA")
			
 
				+        # First lookup finds it…
			
 
				+        assert server._lookup_pending_request_client(b'{"print": {"sequence_id": "100"}}') == "clientA"
			
 
				+        # …and removes it. Second lookup with the same seq returns None
			
 
				+        # (treated as printer-initiated → broadcast fallback).
			
 
				+        assert server._lookup_pending_request_client(b'{"print": {"sequence_id": "100"}}') is None
			
 
				+
			
 
				+    def test_fifo_eviction_when_cache_fills(self, server):
			
 
				+        """If a slicer sends many commands without responses (or the
			
 
				+        responses never arrive), the oldest entries age out so the dict
			
 
				+        can't grow unbounded."""
			
 
				+        from backend.app.services.virtual_printer.mqtt_server import _PENDING_REQUEST_MAX_ENTRIES
			
 
				+
			
 
				+        # Fill the dict to one over the cap.
			
 
				+        for i in range(_PENDING_REQUEST_MAX_ENTRIES + 1):
			
 
				+            server._record_pending_request({"print": {"sequence_id": str(i)}}, "clientA")
			
 
				+        # The dict is capped — the oldest entry ("0") is gone, the newest is in.
			
 
				+        assert len(server._pending_requests) <= _PENDING_REQUEST_MAX_ENTRIES
			
 
				+        assert "0" not in server._pending_requests
			
 
				+        assert str(_PENDING_REQUEST_MAX_ENTRIES) in server._pending_requests
			
 
				+
			
 
				+    def test_response_without_recorded_seq_returns_none_for_broadcast(self, server):
			
 
				+        """Printer-initiated pushes (push_status etc.) have a sequence_id
			
 
				+        the bridge never saw recorded. ``_lookup_pending_request_client``
			
 
				+        must return None so ``push_raw_to_clients`` falls back to fan-out
			
 
				+        — every slicer expects to receive these unsolicited messages."""
			
 
				+        # No record for this seq id.
			
 
				+        assert server._lookup_pending_request_client(b'{"print": {"sequence_id": "777"}}') is None
			
 
				+
			
 
				+    def test_malformed_payload_falls_through_to_broadcast(self, server):
			
 
				+        """A non-JSON / non-dict payload must NOT crash the routing path —
			
 
				+        return None so the response broadcasts."""
			
 
				+        assert server._lookup_pending_request_client(b"not valid json") is None
			
 
				+        assert server._lookup_pending_request_client(b'"a string, not a dict"') is None
			
--- a/backend/tests/unit/test_vp_tls_ciphers.py
+++ b/backend/tests/unit/test_vp_tls_ciphers.py
@@ -0,0 +1,205 @@
 
				+"""Regression tests for #1610: every slicer-facing VP TLS context must
			
 
				+explicitly include the plain-RSA AES-GCM cipher suites that real Bambu
			
 
				+printers (and therefore the BambuStudio / OrcaSlicer client paths) expect.
			
 
				+
			
 
				+Real Bambu printers offer only ``AES256-GCM-SHA384`` / ``AES128-GCM-SHA256``
			
 
				+(plain RSA key exchange) on their TLS endpoints. Slicers built against
			
 
				+that surface assume the server side will accept those suites. On
			
 
				+distributions whose OpenSSL ``DEFAULT`` cipher list has been narrowed by a
			
 
				+system crypto policy (Fedora / RHEL ``update-crypto-policies``, hardened
			
 
				+Alpine builds), Python's stock ``SSLContext`` ends up offering only
			
 
				+ECDHE/DHE — no overlap with the slicer's ClientHello, the handshake
			
 
				+aborts, and the slicer reports a generic ``code=-1`` connect error.
			
 
				+
			
 
				+The #620 patch fixed this for the printer-facing CLIENT context in
			
 
				+``tcp_proxy.py::_create_client_ssl_context``. #1610 audited the remaining
			
 
				+slicer-facing surface and applied the same explicit cipher pin to every
			
 
				+context that accepts a slicer connection:
			
 
				+
			
 
				+* ``bind_server.py::_create_tls_context``      — port 3002 (bind/detect)
			
 
				+* ``mqtt_server.py`` (inline in ``start``)     — port 8883 (MQTT-over-TLS)
			
 
				+* ``tcp_proxy.py::_create_server_ssl_context`` — proxy-mode 3002
			
 
				+* ``ftp_server.py`` (inline in ``start``)      — port 990 (FTPS)
			
 
				+
			
 
				+If any of these regress to a context that no longer offers
			
 
				+``AES256-GCM-SHA384`` / ``AES128-GCM-SHA256``, users on hardened distros
			
 
				+will hit the #1610 / #620 cipher-mismatch failure mode.
			
 
				+"""
			
 
				+
			
 
				+import ssl
			
 
				+from pathlib import Path
			
 
				+from unittest.mock import patch
			
 
				+
			
 
				+import pytest
			
 
				+
			
 
				+from backend.app.services.virtual_printer.bind_server import BindServer
			
 
				+from backend.app.services.virtual_printer.certificate import CertificateService
			
 
				+from backend.app.services.virtual_printer.ftp_server import VirtualPrinterFTPServer
			
 
				+from backend.app.services.virtual_printer.mqtt_server import SimpleMQTTServer
			
 
				+from backend.app.services.virtual_printer.tcp_proxy import TLSProxy
			
 
				+
			
 
				+REQUIRED_CIPHERS = ("AES256-GCM-SHA384", "AES128-GCM-SHA256")
			
 
				+
			
 
				+
			
 
				+def _cert_pair(tmp_path: Path) -> tuple[Path, Path]:
			
 
				+    """Generate a real self-signed CA + per-VP cert pair via the production
			
 
				+    CertificateService. Returns ``(cert_path, key_path)`` suitable for
			
 
				+    ``load_cert_chain`` calls inside the VP services under test."""
			
 
				+    svc = CertificateService(cert_dir=tmp_path, serial="01P00A391800001")
			
 
				+    return svc.ensure_certificates()
			
 
				+
			
 
				+
			
 
				+def _assert_required_ciphers(ctx: ssl.SSLContext, where: str) -> None:
			
 
				+    """Fail with a useful diagnostic if either required cipher is missing."""
			
 
				+    offered = {c["name"] for c in ctx.get_ciphers()}
			
 
				+    missing = [c for c in REQUIRED_CIPHERS if c not in offered]
			
 
				+    assert not missing, (
			
 
				+        f"{where}: missing plain-RSA AES-GCM cipher(s) {missing}. "
			
 
				+        f"Real Bambu printers / slicers require these on the slicer-facing "
			
 
				+        f"TLS surface — see #1610. Offered ciphers: {sorted(offered)}"
			
 
				+    )
			
 
				+
			
 
				+
			
 
				+class TestBindServerTlsCiphers:
			
 
				+    def test_create_tls_context_offers_plain_rsa_aes_gcm(self, tmp_path):
			
 
				+        cert_path, key_path = _cert_pair(tmp_path)
			
 
				+        server = BindServer(
			
 
				+            serial="01P00A391800001",
			
 
				+            model="C12",
			
 
				+            name="vp",
			
 
				+            version="01.07.00.00",
			
 
				+            bind_address="127.0.0.1",
			
 
				+            cert_path=cert_path,
			
 
				+            key_path=key_path,
			
 
				+        )
			
 
				+        ctx = server._create_tls_context()
			
 
				+        assert ctx is not None
			
 
				+        _assert_required_ciphers(ctx, "bind_server._create_tls_context")
			
 
				+
			
 
				+
			
 
				+class TestTlsProxyServerCiphers:
			
 
				+    """Slicer-facing side of proxy mode — was not patched by the #620 fix."""
			
 
				+
			
 
				+    def test_create_server_ssl_context_offers_plain_rsa_aes_gcm(self, tmp_path):
			
 
				+        cert_path, key_path = _cert_pair(tmp_path)
			
 
				+        proxy = TLSProxy(
			
 
				+            name="Bind-TLS",
			
 
				+            listen_port=3002,
			
 
				+            target_host="127.0.0.1",
			
 
				+            target_port=3002,
			
 
				+            server_cert_path=str(cert_path),
			
 
				+            server_key_path=str(key_path),
			
 
				+            on_connect=lambda cid: None,
			
 
				+            on_disconnect=lambda cid: None,
			
 
				+            bind_address="127.0.0.1",
			
 
				+        )
			
 
				+        ctx = proxy._create_server_ssl_context()
			
 
				+        _assert_required_ciphers(ctx, "tcp_proxy._create_server_ssl_context")
			
 
				+
			
 
				+    def test_create_client_ssl_context_still_offers_plain_rsa_aes_gcm(self, tmp_path):
			
 
				+        """The original #620 fix must remain in place."""
			
 
				+        cert_path, key_path = _cert_pair(tmp_path)
			
 
				+        proxy = TLSProxy(
			
 
				+            name="Bind-TLS",
			
 
				+            listen_port=3002,
			
 
				+            target_host="127.0.0.1",
			
 
				+            target_port=3002,
			
 
				+            server_cert_path=str(cert_path),
			
 
				+            server_key_path=str(key_path),
			
 
				+            on_connect=lambda cid: None,
			
 
				+            on_disconnect=lambda cid: None,
			
 
				+            bind_address="127.0.0.1",
			
 
				+        )
			
 
				+        ctx = proxy._create_client_ssl_context()
			
 
				+        _assert_required_ciphers(ctx, "tcp_proxy._create_client_ssl_context")
			
 
				+
			
 
				+
			
 
				+class TestMqttServerTlsCiphers:
			
 
				+    """MQTT server builds its SSLContext inline in start(); intercept the
			
 
				+    ``asyncio.start_server`` call so the test doesn't actually bind a port."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_start_configures_plain_rsa_aes_gcm(self, tmp_path):
			
 
				+        cert_path, key_path = _cert_pair(tmp_path)
			
 
				+        server = SimpleMQTTServer(
			
 
				+            serial="01P00A391800001",
			
 
				+            access_code="deadbeef",
			
 
				+            cert_path=cert_path,
			
 
				+            key_path=key_path,
			
 
				+            model="C12",
			
 
				+            bind_address="127.0.0.1",
			
 
				+        )
			
 
				+
			
 
				+        captured: dict[str, ssl.SSLContext] = {}
			
 
				+
			
 
				+        async def _capture(*_args, ssl=None, **_kwargs):
			
 
				+            captured["ctx"] = ssl
			
 
				+
			
 
				+            class _FakeServer:
			
 
				+                sockets = []
			
 
				+
			
 
				+                def close(self):
			
 
				+                    pass
			
 
				+
			
 
				+                async def wait_closed(self):
			
 
				+                    pass
			
 
				+
			
 
				+                def is_serving(self):
			
 
				+                    return False
			
 
				+
			
 
				+            return _FakeServer()
			
 
				+
			
 
				+        with patch("asyncio.start_server", _capture):
			
 
				+            await server.start()
			
 
				+        try:
			
 
				+            assert "ctx" in captured, "asyncio.start_server was not invoked"
			
 
				+            _assert_required_ciphers(captured["ctx"], "mqtt_server.start")
			
 
				+        finally:
			
 
				+            await server.stop()
			
 
				+
			
 
				+
			
 
				+class TestFtpServerTlsCiphers:
			
 
				+    """FTP server builds its SSLContext inline in start()."""
			
 
				+
			
 
				+    @pytest.mark.asyncio
			
 
				+    async def test_start_configures_plain_rsa_aes_gcm(self, tmp_path):
			
 
				+        cert_path, key_path = _cert_pair(tmp_path)
			
 
				+        upload_dir = tmp_path / "uploads"
			
 
				+        upload_dir.mkdir()
			
 
				+        server = VirtualPrinterFTPServer(
			
 
				+            upload_dir=upload_dir,
			
 
				+            access_code="deadbeef",
			
 
				+            cert_path=cert_path,
			
 
				+            key_path=key_path,
			
 
				+            bind_address="127.0.0.1",
			
 
				+        )
			
 
				+
			
 
				+        captured: dict[str, ssl.SSLContext] = {}
			
 
				+
			
 
				+        async def _capture(*_args, ssl=None, **_kwargs):
			
 
				+            captured["ctx"] = ssl
			
 
				+
			
 
				+            class _FakeServer:
			
 
				+                sockets = []
			
 
				+
			
 
				+                def close(self):
			
 
				+                    pass
			
 
				+
			
 
				+                async def wait_closed(self):
			
 
				+                    pass
			
 
				+
			
 
				+                def is_serving(self):
			
 
				+                    return False
			
 
				+
			
 
				+                async def serve_forever(self):
			
 
				+                    pass
			
 
				+
			
 
				+            return _FakeServer()
			
 
				+
			
 
				+        with patch("asyncio.start_server", _capture):
			
 
				+            await server.start()
			
 
				+        try:
			
 
				+            assert "ctx" in captured, "asyncio.start_server was not invoked"
			
 
				+            _assert_required_ciphers(captured["ctx"], "ftp_server.start")
			
 
				+        finally:
			
 
				+            await server.stop()
			
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -34,7 +34,7 @@ services:
 
				     #  - "6000:6000"                  # Virtual printer file transfer tunnel
			
 
				     #  - "322:322"                    # Virtual printer RTSP camera (X1/H2/P2; proxy mode + non-proxy modes with a target printer)
			
 
				     #  - "2024-2026:2024-2026"        # Virtual printer proprietary ports (A1/P1S)
			
 
				-    #  - "50000-50100:50000-50100"    # Virtual printer FTP passive data
			
 
				+    #  - "50000-51000:50000-51000"    # Virtual printer FTP passive data (widened from 50000-50100 for multi-VP headroom)
			
 
				     volumes:
			
 
				       - bambuddy_data:/app/data
			
 
				       - bambuddy_logs:/app/logs
			
@@ -69,6 +69,14 @@ services:
 
				       # Enable the system trust store with the USE_SYSTEM_TRUST_STORE env var to
			
 
				       # have Bambuddy trust the certificate.
			
 
				       # - /path/to/certs:/usr/local/share/ca-certificates
			
 
				+      #
			
 
				+      # External library folders. Mount the host paths the operator wants
			
 
				+      # users to be able to register as external folders. The in-container
			
 
				+      # paths chosen here MUST appear in BAMBUDDY_EXTERNAL_ROOTS below.
			
 
				+      # Read-only (:ro) is recommended unless you want users uploading
			
 
				+      # files back to the host share.
			
 
				+      #- /mnt/nas/3d-prints:/external/nas:ro
			
 
				+      #- /srv/library:/external/projects:ro
			
 
				     environment:
			
 
				       - TZ=${TZ:-Europe/Berlin}
			
 
				       # User/group the container drops to after the entrypoint normalises
			
@@ -101,6 +109,16 @@ services:
 
				       # to manage the key out-of-band (e.g. via a secret manager).
			
 
				       #- MFA_ENCRYPTION_KEY=
			
 
				       #
			
 
				+      # External library folders (GHSA-r2qv follow-up). Empty default
			
 
				+      # disables the "Add external folder" feature; set to one or more
			
 
				+      # colon-separated absolute paths INSIDE THE CONTAINER to opt in.
			
 
				+      # The paths must also be bind-mounted from the host — uncomment
			
 
				+      # the matching volume snippet below.
			
 
				+      # Example for a single NAS mount:
			
 
				+      #- BAMBUDDY_EXTERNAL_ROOTS=/external/nas
			
 
				+      # Example for two roots:
			
 
				+      #- BAMBUDDY_EXTERNAL_ROOTS=/external/nas:/external/projects
			
 
				+      #
			
 
				       # Enable System Trust Store for certificate validation (e.g. for local Home Assistant)
			
 
				       # You also need to mount your certificates to the container (see volumes section above).
			
 
				       # - USE_SYSTEM_TRUST_STORE=true
			
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -56,7 +56,7 @@
 
				     "@types/react": "^19.2.5",
			
 
				     "@types/react-dom": "^19.2.3",
			
 
				     "@vitejs/plugin-react": "^5.1.1",
			
 
				-    "@vitest/coverage-v8": "^3.2.4",
			
 
				+    "@vitest/coverage-v8": "^4.1.8",
			
 
				     "autoprefixer": "^10.4.22",
			
 
				     "baseline-browser-mapping": "^2.9.19",
			
 
				     "eslint": "^9.39.1",
			
@@ -70,6 +70,6 @@
 
				     "typescript": "~5.9.3",
			
 
				     "typescript-eslint": "^8.46.4",
			
 
				     "vite": "^7.3.2",
			
 
				-    "vitest": "^3.2.4"
			
 
				+    "vitest": "^4.1.8"
			
 
				   }
			
 
				 }