Reported bug: filling Jamiroquai's "Light Years" single pulled in
Gut's "Light Years" album tracks (different artist, completely
different genre — track titles like "Wound Fuck" and "Eat My Cum"
made the contamination obvious). The Album Completeness auto-fill
was the only file-copying path with a loose 0.50 SequenceMatcher
artist gate, which let unrelated candidates through whenever the
title matched well.
Two-stage defense now sits on the only album-fill code path
(_fix_incomplete_album in core/repair_worker.py):
- Stage 1 — _album_fill_target_artist_allows_track. Pre-search
gate: before doing any library lookup for a missing track,
refuse to operate if the missing track's source artist(s)
don't match the target album's artist. Compilation albums
(album_artist in {'various artists', 'various', 'soundtrack'})
bypass the gate so legitimate VA releases still work. Empty
source-artist metadata also bypasses for backward compat with
older missing-track records that don't carry per-track artist.
- Stage 2 — _album_fill_artist_names_match. Replaces the old
0.50 SequenceMatcher with an alias-aware 0.82 threshold that
uses core.matching.artist_aliases when available (handles
diacritic variants like Beyoncé/Beyonce and known stage names)
with a normalized-similarity fallback if the aliases module
isn't importable. Skipped candidates are logged at debug so a
later support ticket can show what was rejected and why.
Tests in tests/test_repair_worker_album_fill.py reproduce the
exact reported scenario: target album "Light Years" by Gut +
missing track from a Jamiroquai source → skipped with a logged
warning, no copy attempted, wishlist not poisoned. Second test
covers Stage 2 directly with a wrong-artist library candidate.
Existing test_perform_album_fill_copy_branch still passes.
Note: this fix prevents NEW cross-artist contamination via
Album Completeness. It does not clean up the data anomaly that
made Gut's library entry appear to have a "Light Years" album
in the first place — that's a separate data-quality issue worth
investigating if it recurs.
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