Adds a daily off-hours VACUUM (ANALYZE) over the high-churn tables the
retention/purge sweeps churn (app_logs, notifications, token tables, notes,
note_versions), on top of Postgres autovacuum, to reclaim bloat left by the
nightly bulk DELETEs and keep planner stats fresh.
- services/db_maintenance.py: run_maintenance() over a closed table allowlist
via an AUTOCOMMIT connection (VACUUM can't run in a txn); per-table summary
persisted as the db_maintenance_last_run admin setting.
- services/db_maintenance_scheduler.py: BackgroundScheduler cron (default
04:00 UTC, after the 03:30 trash purge); enabled-gate checked at fire time;
live reschedule on hour change. Wired into app.py start/stop.
- routes/admin.py: admin-only GET/PUT /api/admin/db-maintenance + POST /run.
- settings.py: set_admin_setting() (write-side of get_admin_setting) for
out-of-request writes.
- SettingsView.vue: admin 'Database maintenance' card — enable toggle, run-hour
(UTC), Run-now, last-run summary.
- Tests: allowlist is closed, VACUUM issued per table, one failure doesn't
abort the rest, summary persisted; route/scheduler/service surface.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
