bvandeusenandClaude Opus 5
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Two identities per track, because they answer different questions: - audio_stream_sha256: SHA-256 of the ENCODED audio packets (ffmpeg -map 0:a -c:a copy -f hash). Equal means identical audio whatever the tags say. Measured against the #3885 pair: the two WWW files hash identically here and differently as whole files. Packets rather than decoded samples, so an ffmpeg upgrade cannot silently change every stored hash, and nothing is decoded. - chromaprint: fpcalc -raw -signed. The same recording at another bitrate or codec, for the acoustic tier. fpcalc ships in the image (libchromaprint-tools); shelled out because CGO_ENABLED=0 rules out bindings. Stored in a track_fingerprints table rather than on tracks: eight queries read tracks with SELECT *, including album pages, search and the Subsonic surface, and a ~4 KB array there would be de-TOASTed on every one of them. The scan fingerprints only bytes it has not seen (a new path, or mtime past the row's). A tag-repair pass leaves fingerprints alone, and unchanged files with no fingerprint are the backfill's job (#3908). Folding that into the skip check would re-decode the whole library on the first scan after upgrade and push a sync change per track. A failure that says nothing about the file (timeout, cancelled scan, tool not installed) is never stored, and on changed bytes it removes the old row. A tool that rejects the file stores NULL at the current version, so the backfill does not retry it every boot. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SQ31KQpYbStyK5y58UmPLH