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feat: cache size management and LRU eviction (closes #51) #55

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sneak merged 12 commits from feature/cache-size-eviction into main 2026-08-09 13:22:51 +02:00
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TODO.md
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@@ -28,19 +28,18 @@ P1: implement blocked networks configuration to extend SSRF protection
framework (explicit values used exactly with no floor, `0` disables
the disk cache entirely, omitted defaults to max(75% of free space
on the filesystem containing `<state_dir>/cache/`, 500 MiB), logged
at startup); processed variants are now tracked in the database
(migration 002 adds `variant_content` and an LRU timestamp on
`source_content`) so total usage is two SUMs, never a directory scan
on the hot path; a background goroutine evicts globally
least-recently-used entries (variants and source blobs merged) to
the limit, woken by a periodic ticker and by write-pressure
notifications from stores; a source blob and ALL of its
`source_metadata` references are deleted in one transaction before
the file is unlinked, so multi-referenced blobs are never removed
while referenced and rows never point at deleted files; a startup
reconciliation pass adopts untracked variant files, drops rows for
missing files, removes unreachable source blobs, and sweeps stale
temp files
at startup); processed variants are now tracked in the database (a
new `variant_content` table and an LRU timestamp on `source_content`)
so total usage is two SUMs, never a directory scan on the hot path; a
background goroutine evicts globally least-recently-used entries
(variants and source blobs merged) to the limit, woken by a periodic
ticker and by write-pressure notifications from stores; a source
blob and ALL of its `source_metadata` references are deleted in one
transaction before the file is unlinked, so multi-referenced blobs
are never removed while referenced and rows never point at deleted
files; a startup and periodic reconciliation pass adopts untracked
variant files, drops rows for missing files, removes unreachable
source blobs, and sweeps stale temp files
- 2026-08-07 validate configuration on startup, fail fast on bad
config (closes #52): a config value that is set but unparseable or
invalid aborts startup naming the key and value (defaults apply only