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Store the stem model in Application Support instead of Caches - #87
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sanylax0 merged 1 commit intoJul 18, 2026
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Caches is OS-evictable, so the 158 MB HT-Demucs model could silently vanish and re-download at play time — a delay and a network/memory spike stacked exactly on playback start (the jetsam RCA's ~50 s window matches a silent re-download). Application Support persists; excluded from backup; existing Caches copies are migrated instead of re-downloaded.
sanylax0
approved these changes
Jul 18, 2026
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What
PR 3 of the jetsam RCA plan. The 158 MB HT-Demucs model lived in
Caches, which iOS evicts under storage pressure — so the model could silently vanish and re-download at play time, adding both a 10–30 s silent delay (which matches the observed ~50 s kill window) and a network/disk spike stacked on playback start, recurring across launches.How
StemModelStore.directorymoves to Application Support (isExcludedFromBackup, same pattern asStemCache).ensureModel()first migrates a survivingCachescopy via a rename instead of re-downloading. No other behavior changes.Testing
On device: after merging, first
ensureModelcall either migrates the existing file (instant) or downloads once; subsequent launches must never hit the network for the model. Verify with themem[model ensured]breadcrumb appearing immediately afterseparation task begin.🤖 Generated with Claude Code
https://claude.ai/code/session_013TJoWkqg8bzkGdzxWhWjWP
Generated by Claude Code