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ab2f1b45de
* perf(subsonic): keep album/mediafile params on stack in response helpers Two helpers were forcing their entire value parameter onto the heap via pointer-to-field aliasing, adding one full-struct heap allocation per response item on hot Subsonic endpoints (search3, getAlbumList2, etc.). - childFromMediaFile assigned &mf.BirthTime to the returned Child, pulling the whole ~1KB model.MediaFile to the heap on every call. - buildDiscSubtitles passed &a.UpdatedAt to NewArtworkID inside a loop, pulling the whole model.Album to the heap on every album with discs. Both now copy the time.Time to a stack-local and use gg.P / &local so only the small time.Time escapes. Verified via go build -gcflags=-m=2: moved to heap: mf and moved to heap: a are gone at these sites. * perf(metadata): avoid per-track closure allocations in PID computation createGetPID was a factory that returned nested closures capturing mf model.MediaFile (~992 bytes) by reference. Since it is called three times per track during scans (trackPID, albumID, artistID), every track triggered the allocation of three closures plus a heap copy of the full MediaFile. Refactor the body into package-level functions (computePID, getPIDAttr) that take hash as an explicit parameter and the inner slice.Map callback to an indexed for loop, removing the closure-capture of mf entirely. trackPID/albumID/artistID now call computePID directly. The tiny createGetPID wrapper was kept only for tests; move the closure-building into the test file so production has no dead API. Verified via go build -gcflags=-m=2 on model/metadata: no "moved to heap: mf" anywhere in persistent_ids.go, and the callers in map_mediafile.go / map_participants.go no longer heap-promote their MediaFile argument.