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Closes #919 ## Summary Enables SQLite incremental auto-vacuum so the database file actually shrinks after retention reaper deletes old data. Previously, `DELETE` operations freed pages internally but never returned disk space to the OS. ## Changes ### 1. Auto-vacuum on new databases - `PRAGMA auto_vacuum = INCREMENTAL` set via DSN pragma before `journal_mode(WAL)` in the ingestor's `OpenStoreWithInterval` - Must be set before any tables are created; DSN ordering ensures this ### 2. Post-reaper incremental vacuum - `PRAGMA incremental_vacuum(N)` runs after every retention reaper cycle (packets, metrics, observers, neighbor edges) - N defaults to 1024 pages, configurable via `db.incrementalVacuumPages` - Noop on `auto_vacuum=NONE` databases (safe before migration) - Added to both server and ingestor ### 3. Opt-in full VACUUM for existing databases - Startup check logs a clear warning if `auto_vacuum != INCREMENTAL` - `db.vacuumOnStartup: true` config triggers one-time `PRAGMA auto_vacuum = INCREMENTAL; VACUUM` - Logs start/end time for operator visibility ### 4. Documentation - `docs/user-guide/configuration.md`: retention section notes that lowering retention doesn't immediately shrink the DB - `docs/user-guide/database.md`: new guide covering WAL, auto-vacuum, migration, manual VACUUM ### 5. Tests - `TestNewDBHasIncrementalAutoVacuum` — fresh DB gets `auto_vacuum=2` - `TestExistingDBHasAutoVacuumNone` — old DB stays at `auto_vacuum=0` - `TestVacuumOnStartupMigratesDB` — full VACUUM sets `auto_vacuum=2` - `TestIncrementalVacuumReducesFreelist` — DELETE + vacuum shrinks freelist - `TestCheckAutoVacuumLogs` — handles both modes without panic - `TestConfigIncrementalVacuumPages` — config defaults and overrides ## Migration path for existing databases 1. On startup, CoreScope logs: `[db] auto_vacuum=NONE — DB needs one-time VACUUM...` 2. Set `db.vacuumOnStartup: true` in config.json 3. Restart — VACUUM runs (blocks startup, minutes on large DBs) 4. Remove `vacuumOnStartup` after migration ## Test results ``` ok github.com/corescope/server 19.448s ok github.com/corescope/ingestor 30.682s ``` --------- Co-authored-by: you <you@example.com>