How to verify Gitlab is successfully using RDS after migrating from local DB

I just migrated from the bundled postgres server to RDS. I entered all the connection settings into gitlab.rb and reconfigured without errors, however, I’d like to know if there is some sort of query or job I can run to be 100% sure that gitlab is now using and updating the new DB.

On my RDS console I can see some activity in CloudWatch, but that doesn’t tell me enough.