Ships the source-id cleanup to all users: a marker-gated one-time migration in
MusicDatabase init clears any source id (deezer/spotify/itunes/musicbrainz/
discogs/audiodb/qobuz/tidal) shared across differently-named artists — the
enrichment-corruption signature. Same-name cross-server duplicates are left
untouched (DISTINCT-name check). Cleared rows re-derive correct ids on the next
enrichment pass; the now name-guarded workers won't re-corrupt.
Runs once (CREATE TABLE _source_id_dedupe_v1 marker), idempotent, per-column
try/except so a missing column can't abort it. Test forces a re-run and asserts
corruption is cleared while a legit same-name dup survives.
core/maintenance/dedupe_source_ids.py + scripts/dedupe_source_ids.py: find
source-id clusters held by differently-named artists (the enrichment-corruption
signature) and clear the id + match-status on those rows so the now-name-checked
workers re-derive each correctly on the next enrichment pass. Same-name
duplicates (one artist across two media servers) are left untouched.
Dry-run by default; --apply to write. 8 seam tests cover detection (corrupt vs
legit), dry-run safety, apply behaviour, and the no-op case.
