RunPeriodicMaintenance и RunCleanup удалены; scheduler политик в StartBackground; deprecated /postgres/cleanup принимает policy_id.
Co-authored-by: Cursor <[email protected]>
Added PostgreSQL monitoring and maintenance capabilities to the API, including new endpoints for instance-level metrics, maintenance operations, and job scheduling. Updated the HTTP API to support PostgreSQL monitoring routes and integrated a background scheduler for metrics collection. Enhanced the CLI with database commands for maintenance tasks. Updated documentation to reflect these changes.
