Scan queue handler now returns a QueueLibraryScanResult enum
(Queued|NotFound|SyncDisabled|AlreadyScanning) instead of a lying bool;
LibrariesController.ScanLibrary maps them to 202/404/422/409 with ProblemDetails.
Guard the lock->enqueue with the EnqueueWithTraktLock compensating-unlock pattern.
ScannerService now releases every library/collection lock in a finally so a handler
exception can't leak the lock. Plex "Shows" scheduler batch (one lock, two messages)
now has only the trailing SynchronizePlexNetworks carry the single release
(Unlock flag), mirroring the scheduler Trakt tail-token precedent.
Guard the other lock->enqueue producers (Create/UpdateLocalLibrary, UpdateTraktList)
with compensating unlock. SPA drops the PENDING_GRACE_TICKS heuristic now that the
POST reports 202/409/404/422 directly: 202 -> pending+poll, 409 -> reconcile (no
error toast), 404/422 -> surface error.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
POST /api/libraries/{id}/scan-show resolved the target show via
GetShowIdByTitle, an EF.Functions.Like "%title%" substring match with
no OrderBy - non-deterministic under duplicate/overlapping titles and
capable of scanning the wrong show. The Blazor UI never had this bug
(it always passed the exact show id); this endpoint shipped days ago
in PR #216 with no external consumers, so the contract break is safe.
BREAKING CHANGE: ScanShowRequest now takes `showId: int` instead of
`showTitle: string`. Replaced ITelevisionRepository.GetShowIdByTitle
with GetShowTitle(libraryId, showId), which also enforces the show
belongs to the given library. LibrariesController.ScanShow now returns
a genuine 404 ProblemDetails (via ApiResults.NotFoundProblem, the
established pre-check pattern from TemplateController.DeleteGroup)
when the show id doesn't exist in that library, then queues
QueueShowScanByLibraryId with the DB-resolved title.
SPA: libraries.ts ScanShowParams.showId replaces showTitle;
MediaDetailScreen.tsx passes show.id. Extended
ApiErrorResponseMetadataTests and OpenApiErrorResponseContractTests
with the new 404 contract for ScanShow. Regenerated v1.json / v1.d.ts
via scripts/update-openapi.sh + npm run generate:api.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>