- Introduced `PostgresCooldownStateStore` for saving and loading cooldown states in a PostgreSQL database. - Supported runtime cooldown state management with efficient upsert and deletion. - Added configurable integration via `PostgresStoreConfig` and updated schema management to include cooldown-related tables. - Included tests to validate persistence, normalization, and concurrent handling of cooldown state records. - Enabled overriding cooldown state stores via service builder and SDK configuration. Closes: #4254