Connecting to Fly Postgres
Access Postgres from your application to query data, perform migrations, and all the other stuff that needs to be done to make a database useful.
Connect From a Fly App
Access your Postgres from within the same Fly.io private network.
Connect With flyctl
Access your Postgres app from the terminal using flyctl.
External Connections
Access Postgres from a different Fly internal private network, or from outside Fly.io entirely.