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JellyfinMusicVideoLibraryScanner.UpdateMetadata copied only scalar fields for an EXISTING music video, so genres/tags/studios/artists edited in Jellyfin never reached ErsatzTV — the update path silently dropped every child collection (only the Add path ever persisted them). Root cause is inherited from upstream: unlike the movie/episode Jellyfin path, which reconciles collections inside the tracked repository GetOrAdd, MusicVideoRepository.GetOrAdd is AsNoTracking and the scanner never reconciled the collections itself. Fix mirrors PlexMovieLibraryScanner.UpdateMetadata's remove-stale + add-new idiom, reconciling exactly the collections that BOTH the Add path persists AND GetOrAdd eager-loads: Genres, Tags, Studios, Artists. Guids (add-persisted but not eager-loaded — would duplicate) and Directors (eager-loaded but not add-persisted for music videos) are deliberately out of scope. Movie/Episode paths do NOT have this gap (they reconcile in the tracked repo GetOrAdd), so no separate fix is needed there. Test is an interaction test (substituted repos, canned existing item) verifying the exact reconcile calls; proven non-vacuous. The real-DB double-scan approach can't drive this: the in-memory harness shares one SQLite connection across contexts and mid-scan GetOrAdd's First()-nav path predicate mis-resolves once the existing item carries metadata children — a harness-only quirk (prod uses per-context pooled connections). fixes #497 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>