そういえば
$ heroku pg:info
=== HEROKU_POSTGRESQL_CYAN_URL, DATABASE_URL
Plan: Standard 0
Status: Available
Data Size: 11.9 GB
Tables: 81
PG Version: 10.17
Connections: 18/120
Connection Pooling: Available
Credentials: 1
Fork/Follow: Available
Rollback: earliest from 2021-07-15 19:43
Created: 2021-07-12 10:28
Region: us
Data Encryption: In Use
Continuous Protection: On
Maintenance: not required
Maintenance window: Thursdays 19:30 to 23:30 UTC
Add-on: postgresql-clean-89871