Most usage columns of table based on system.query_log
| prodenv.`.pg_session_notifications`.timestamp | 6 |
| prodenv.`.pg_session_notifications`.id | 6 |
| prodenv.`.pg_session_notifications`.contents | 6 |
| prodenv.`.pg_session_notifications`.alert_name | 6 |
| prodenv.`.pg_session_notifications`.channel_type | 6 |
