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ersatztv/ErsatzTV.Scanner/Core/Metadata
timothy 4bdad4bf52
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fix(496,484): thread #484's projection-failure guard through the new music-video scanner [decisions-edit]
Rebasing onto #612 exposed a silent gap rather than a conflict. #612 added a
`projectionFailureCount` parameter to MediaServerReconciliationGuard.ShouldFlagMissing that
refuses the sweep when the enumeration reported swallowed projection exceptions — but the
parameter is OPTIONAL with a default of 0, so this scanner compiled unchanged while opting
out of the protection entirely. ProjectToMusicVideo has exactly the swallowing catch #484
exists to defend against, so the music-video sweep would have been the only one unguarded.

- MediaServerMusicVideoLibraryScanner creates one MediaServerProjectionFailureCounter per
  enumeration (never a field on the singleton api client, so concurrent scans of different
  libraries can't leak failures into each other's sweep decision), passes it to
  GetMusicVideoLibraryItems, and feeds its Count to ShouldFlagMissing.
- The single guard call also gates the #496 legacy path diff, which is more exposed: a
  legacy row has no etag to fall back on.
- ProjectToMusicVideo now returns MediaServerProjectionResult<JellyfinMusicVideo>, combining
  #612's Skipped/Failed distinction with #496's identity type.
- main's own #484 music-video test targeted the pre-#496 hard-delete scanner (FindMusicVideoPaths
  /DeleteByPath) and no longer applies; it is replaced by two tests in the new architecture
  covering the identity sweep and the legacy sweep. Both proven non-vacuous — removing
  projectionFailures.Count from the guard call fails exactly those two.

4,277 tests green; format/BOM clean; decisions validator OK.
2026-07-25 17:27:50 +02:00
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