Please timely renew your RDS-PostgreSQL to avoid loss due to instance expiration.
1.1.1. Renewing
When the product instance expires, the corresponding service is suspended. At this point, you can defer the expiration time of the instance through renewal. For more information, see Renewal Rule Description.
1.1.2. Unsubscribing
When the product instance expires, the corresponding service is suspended. You can also unsubscribe from an unexpired instance by manually doing so. For more information, see Unsubscribing Process.