Introduced `_failure_state` to track consecutive failures per target and `_failure_log_interval_seconds` to control logging frequency. Added logs for recovery when a target recovers and throttled error logs to reduce noise for recurring errors.
Introduced logic to check the existence of `pg_stat_checkpointer` and fetch corresponding statistics when available. This ensures compatibility with newer PostgreSQL versions while maintaining backward support using `pg_stat_bgwriter`.
This commit introduces a `use_pg_stat_statements` flag for targets, allowing users to enable or disable the use of `pg_stat_statements` for query insights. It includes database schema changes, backend logic, and UI updates to manage this setting in both creation and editing workflows.
This commit introduces alert management capabilities, including creating, updating, listing, and removing custom SQL-based alerts in the backend. It adds the necessary database migrations, API endpoints, and frontend pages to manage alerts, enabling users to define thresholds and monitor system health effectively.
