SQLite key-value store wrapper

Claude b866dacdd2 feat(store): add TTL support and harden test coverage to 90.9% ... Phase 0 -- Hardening: - Fix SQLITE_BUSY under concurrent writes by setting SetMaxOpenConns(1) and PRAGMA busy_timeout=5000 - Add comprehensive tests: concurrent read/write (10 goroutines), edge cases (unicode, null bytes, SQL injection, long keys), error paths (closed store, invalid paths, corrupt files), group isolation, upsert verification, WAL mode verification, ErrNotFound wrapping - Add benchmarks: Set, Get, GetAll (10K keys), file-backed Set Phase 1 -- TTL Support: - Add expires_at nullable column with schema migration for pre-TTL DBs - SetWithTTL(group, key, value, duration) stores keys that auto-expire - Lazy deletion on Get for expired keys - Background purge goroutine (configurable interval, default 60s) - Public PurgeExpired() method for manual cleanup - Count, GetAll, Render all exclude expired entries - Set clears TTL when overwriting a TTL key Coverage: 73.1% -> 90.9% (48 tests, 0 races) Co-Authored-By: Charon <developers@lethean.io>		2026-02-20 01:14:08 +00:00
CLAUDE.md	feat(store): add TTL support and harden test coverage to 90.9%	2026-02-20 01:14:08 +00:00
FINDINGS.md	feat(store): add TTL support and harden test coverage to 90.9%	2026-02-20 01:14:08 +00:00
go.mod	fix: add modernc.org/sqlite dependency	2026-02-19 16:10:16 +00:00
go.sum	fix: add modernc.org/sqlite dependency	2026-02-19 16:10:16 +00:00
store.go	feat(store): add TTL support and harden test coverage to 90.9%	2026-02-20 01:14:08 +00:00
store_test.go	feat(store): add TTL support and harden test coverage to 90.9%	2026-02-20 01:14:08 +00:00
TODO.md	feat(store): add TTL support and harden test coverage to 90.9%	2026-02-20 01:14:08 +00:00