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BoulderBadgeDad 87e5e1fa23 #702: make mirrored-playlist cancel/reset/delete idempotent (un-wedge LB weekly sync) ... Root cause (from the reporter's app.log): a ListenBrainz weekly playlist syncs through the in-memory youtube_playlist_states discovery machine. When that live state is lost — a Docker restart, or the discovery process ending while the user waits for the media-server scan — the DB discover-download snapshot survives but the live state is gone. Every recovery action (Cancel/Reset/Delete) then hit `key not in states` and returned 404 "YouTube playlist not found" (hence the confusing "Youtube" on a ListenBrainz playlist), leaving the playlist permanently wedged with no way to dismiss or re-sync. Works for the maintainer because a single session with no restart keeps the live state alive. Fix — these are cleanup ops, so "the thing is already gone" is SUCCESS, not 404: - cancel_sync core (shared by YouTube + ListenBrainz + Tidal/Deezer/Qobuz/...) → missing key returns idempotent success. - reset_youtube_playlist / delete_youtube_playlist → same. The playlist becomes recoverable: Cancel/Reset clears the dead state and the user re-syncs fresh. Tests: cancel_sync core (missing key = idempotent 200 not 404; present key still cancels + clears the worker + reverts phase); endpoint-level idempotency for cancel/reset/delete; updated the old test that locked the 404 wedge. 834 sync/ discovery tests green.		2 weeks ago
..
__init__.py	PR5a: lift _run_sync_task to core/discovery/sync.py	2 months ago
test_cancel_sync_idempotent.py	#702: make mirrored-playlist cancel/reset/delete idempotent (un-wedge LB weekly sync)	2 weeks ago
test_discovery_beatport.py	PR5f: lift _run_beatport_discovery_worker to core/discovery/beatport.py	2 months ago
test_discovery_deezer.py	PR5d: lift _run_deezer_discovery_worker to core/discovery/deezer.py	2 months ago
test_discovery_endpoints.py	#702: make mirrored-playlist cancel/reset/delete idempotent (un-wedge LB weekly sync)	2 weeks ago
test_discovery_listenbrainz.py	PR5g: lift _run_listenbrainz_discovery_worker to core/discovery/listenbrainz.py	2 months ago
test_discovery_playlist.py	Fix #785: file/CSV playlists fail to match (raw 'Artist - Title' titles)	3 weeks ago
test_discovery_quality_scanner.py	Preserve artwork in quality scanner wishlist handoff	2 months ago
test_discovery_spotify_public.py	PR5e: lift _run_spotify_public_discovery_worker to core/discovery/spotify_public.py	2 months ago
test_discovery_sync.py	Sync: append mode preserves the playlist image like reconcile (#811)	3 weeks ago
test_discovery_tidal.py	Lift _run_tidal_discovery_worker to core/discovery/tidal.py	2 months ago
test_discovery_youtube.py	fix: cast duration_ms to int before :02d format in discovery workers	2 months ago
test_manual_match.py	#799: add equivalence proof that should_rediscover == original pre-scan	3 weeks ago
test_quality_scanner_typed_album.py	Migrate discography + quality scanner to typed Album path	2 months ago
test_similar_artists_library_filter.py	Add MusicBrainz as a metadata source	1 month ago
test_sync_database_only_matcher.py	Fix: Spotify sync crash 'unexpected keyword argument candidate_pool'	4 weeks ago