Completes Stage 2's populate path. Still dormant — no consumer calls it yet.
- resolve_and_store_canonical_for_album(db, album_id, ...): loads the album's
source IDs + its tracks' (duration_ms, title) from the DB via the SAME
loader the Reorganizer uses (load_album_and_tracks + _extract_source_ids), so
the canonical is chosen over exactly the source IDs the reorganizer sees;
scores off the DB track rows (the library's view of the files — no per-file
disk reads), resolves the best fit, and persists it. Returns the stored result
or None when unresolved.
- default_fetch_tracklist(): production fetcher wrapping
get_album_tracks_for_source, normalising to {title, track_number, duration_ms}
(duration best-effort; sec->ms; absent -> scorer leans on count+title).
Design note: chose LAZY resolution (Stages 3-4 consumers call this when they hit
an album with no canonical) over a standalone backfill repair job — no new
scheduling/UI surface, resolves only when a tool actually needs it, and stays
gated (NULL canonical = today's behavior).
Tests: tests/test_canonical_orchestration.py (5) — end-to-end on a real temp DB
(11 files pick the 11-track release over a 17-track deluxe and persist it),
no-source-ids -> None, missing-album -> None, and default_fetch_tracklist
normalization (dict items, seconds->ms) + failure -> None. All canonical +
DB-migration tests green.
Turns the Stage-1 scorer into an end-to-end resolver + persists the result.
Still DORMANT — no consumer reads it yet, so zero behavior change.
- core/metadata/canonical_resolver.py — resolve_canonical_for_album(): builds
candidate releases from the album's per-source IDs (in source-priority order),
fetches each tracklist via an INJECTED fetch_tracklist (so it's unit-testable
without live APIs), scores them with pick_canonical_release, and returns the
best-fit {source, album_id, score}. Skips sources with no id / failed fetch;
returns None when there are no files, no candidates, or nothing clears the
confidence floor.
- database/music_database.py — set_album_canonical() / get_album_canonical()
write/read the Stage-1 columns. get returns None when unresolved, which every
consumer will treat as "fall back to today's behavior".
Tests: tests/test_canonical_resolver.py (7) — best-fit beats priority, priority
breaks true ties, skips missing-id/failed-fetch sources, None on
no-candidates/no-files/below-floor, score rounding. tests/test_canonical_db.py
(4) — set/get round-trip incl. timestamp, unresolved -> None, overwrite,
missing-album -> False. 34 canonical + DB-migration tests pass.
Remaining for Stage 2 (the trigger): read on-disk file durations/titles for an
album, gather its source IDs, call the resolver, store — wired via a backfill
repair job + an enrichment hook. Then Stages 3-4 wire the Reorganizer and Track
Number Repair to READ the pinned canonical.
