Two related bugs reported on Discord by Mushy.
1. The watchlist re-downloaded the same OST track up to 7 times.
``is_track_missing_from_library`` compared Spotify's album name and
the media-server scan's album name with a raw SequenceMatcher at a
strict 0.85 threshold. Compilations and soundtracks routinely fail
this — Spotify reports
``"Napoleon Dynamite (Music From The Motion Picture)"`` while the
Plex / Navidrome / Jellyfin tag scan saves it as
``"Napoleon Dynamite OST"``. Raw similarity ≈ 0.49, so the scanner
declared the track missing on every 30-minute scan and added it back
to the wishlist. The wishlist then issued a fresh download. slskd
appended ``_<19-digit-ns-timestamp>`` to each new copy because the
target file already existed, and the user ended up with seven copies
of one song in one folder.
Fix: extract two pure helpers — ``_normalize_album_for_match``
strips qualifier parentheticals (Music From X, OST, Deluxe Edition,
Remastered, Anniversary, etc.) and trailing dash-clauses;
``_albums_likely_match`` checks equality after normalization,
substring containment, and a relaxed 0.6 fuzzy ratio. A volume /
part / disc / standalone-trailing-number guard rejects pairs like
``"Greatest Hits Vol. 1"`` vs ``"Greatest Hits Vol. 2"`` so the
relaxed threshold doesn't introduce false positives on serialized
releases. After this change the Napoleon Dynamite case collapses
to ``"napoleon dynamite" == "napoleon dynamite"`` via the equality
short-circuit and the redownload loop dies.
2. The duplicate detector found only one of the seven dupe files.
The detector buckets tracks by the first 4 chars of their normalized
tag title. Files written by slskd directly into a library folder
often get inconsistent (or blank) tags from the media-server rescan,
so the seven copies were bucketed apart by parsed title and never
compared.
Fix: refactor the per-bucket comparison into ``_scan_bucket``, then
add a second pass — ``_build_filename_buckets`` re-buckets leftover
tracks by canonical filename stem (slskd dedup tail stripped via
``_strip_slskd_dedup_suffix``, same regex the import-cleanup PR uses)
plus extension. Filename agreement is itself strong evidence the
files came from the same source download, so the second pass calls
``_scan_bucket`` with ``require_metadata_match=False`` to skip the
title / artist / cross-album gates. The same-physical-file guard
still runs so bind-mount duplicates aren't flagged.
72 new regression tests across two files cover the album-match
helpers (28 tests including the Napoleon Dynamite scenario, 7 volume
disagreements, 8 positive/negative pairs, 5 defensive cases) and the
new filename-bucket pass (16 tests across bucket construction, scan
integration, and existing title-pass behavior). Full pytest 1509
passed; ruff clean.
Reported by Mushy in Discord.
6e61890551