Newbie looking for some help with Postgres <> Django connection

Hi All,

I'm looking for tips/resources for a problem I'm facing with my Django app: https://ndcportal.herokuapp.com/

I'm attempting to connect my Dockerized Django app with a PostgreSQL db. The postgres db is already populated, and I can access the data via pgadmin, but I cannot figure out the appropriate settings in my docker-compose.yml & settings.py files to make the postgres db populate my django app.

I've reviewed multiple tutorials/blog posts, including Will Vincents Docker & PostgreSQL tutorial, but I feel like I'm missing one or two final & crucial steps. 

When I change my DB settings for Postgres, & I bring up the app via Docker, I continue running into this OperationalError: 

message:django.db.utils.OperationalError: could not connect to server: Connection refused
Is the server running on host "db" (172.29.0.2) and accepting
TCP/IP connections on port 5433?

Any tips/resources/feedback would be greatly appreciated. Thanks in advance.

Best,
Marc

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