Register MusicBrainz as a first-class metadata source alongside Deezer, iTunes, Spotify, Discogs, and Hydrabase. Expose the shared client through metadata services, add the settings option, and expand the MusicBrainz search adapter with source-compatible artist, album, track, and detail methods.
Carry MusicBrainz IDs through similar-artist discovery, recommended artists, artist map serialization, and personalized playlist selection. Update DB migrations and lookup filters so similar_artist_musicbrainz_id is preserved on older schemas and used for source requirements and library exclusion.
Normalize MusicBrainz album adapter output for import context and add regression coverage for registry mapping, typed album conversion, and similar-artist filtering. Verified by user with 120 focused tests passing.
Reproduced on the personalized playlist pipeline: selecting Fresh Tape
(or any kind) and running the automation surfaced
"Working outside of application context" in the UI.
Root cause: `get_current_profile_id` reads Flask's `g.profile_id` and
only catches `AttributeError`. Outside a request — automation engine,
sync threads, watchlist scanner — `g` raises `RuntimeError` instead,
so the except misses and the handler dies.
Mirrored playlist pipeline never hit this because it hardcodes
profile_id=1 in its sync call. The personalized pipeline calls
`deps.get_current_profile_id()` from a background thread, which is
what tripped the bug. Fresh Tape's generator also resolves the
profile via the same function — same path, same crash.
Fix: broaden the except to `(AttributeError, RuntimeError)` in all
three copies of the helper (`web_server.py`, `core/artists/map.py`,
`core/discovery/hero.py`). All three now safely degrade to profile_id=1
(admin profile) when called outside a request context — matches the
existing intent that single-admin installs Just Work.
No test changes — the existing pipeline tests stub the helper, so
they never exercised the bug. The fix is in the layer above the
stubs.
Body byte-identical to the original. Spotify proxy via registry,
_get_active_discovery_source and get_current_profile_id redefined
as stateless shims, _get_metadata_fallback_client injected via init()
because it composes multiple registry helpers wired in web_server.py.
web_server.py: 35753 → 35586 (-167 lines).
Broque Thomas