PowerShell Universal Docker on Unraid - Postgres queries

Product: PowerShell Universal - Docker Unraid
Version: 5.6.4

Trying to utilize PSU for a simple web app interface with postgres db table an making an API endpoint to query and pull the data back. I’m setup on my unraid server as a docker container but hitting a wall on proper code for actually getting a successful query from my postgres docker instance.

I set this up to store the PSU DB on the same postgres instance, so I know there is some ability here to query the server, i’m just lost on the code setup. I’m hoping someone might be able to provide some crashcourse on the connection setup.

Thanks!