-- Restore the prior tighter CHECK constraints (pre-Deezer/Last.fm).
-- This will fail if any rows currently have artist_art_source =
-- 'deezer' or 'lastfm' (likewise album); operator must clear those
-- rows manually before rolling back.

ALTER TABLE artists DROP CONSTRAINT IF EXISTS artists_artist_art_source_check;
ALTER TABLE artists
    ADD CONSTRAINT artists_artist_art_source_check
    CHECK (artist_art_source IS NULL
           OR artist_art_source IN ('theaudiodb','none'));

ALTER TABLE albums DROP CONSTRAINT IF EXISTS albums_cover_art_source_check;
ALTER TABLE albums
    ADD CONSTRAINT albums_cover_art_source_check
    CHECK (cover_art_source IS NULL
           OR cover_art_source IN ('embedded','sidecar','mbcaa','theaudiodb','none'));

ALTER TABLE cover_art_sources_meta DROP COLUMN IF EXISTS last_registered_providers_hash;