-- 0094_duplicate_distinct.up.sql — duplicates settle themselves (Scribe
-- milestone #498, operator 2026-10-19: "this needs to be automated away").
--
-- distinct: one album holds two versions of a song that sound alike ("Lovesick"
-- and "Lovesick (Instrumental)"). They are not duplicates, and the resolver
-- dismisses them itself. mismatch now also covers one album holding the same
-- audio in several track slots, the resolver's wrong-file case.
-- Rule 36: the new value swaps the constraint in the same migration.
ALTER TABLE duplicate_groups DROP CONSTRAINT duplicate_groups_class_check;
ALTER TABLE duplicate_groups ADD CONSTRAINT duplicate_groups_class_check
    CHECK (class IN ('same_release', 'cross_release', 'mismatch', 'distinct', 'review'));