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How do you connect a remote PostgreSQL database to Heroku?

I'm new to connecting databases in Heroku. I posted this question here about an error I was having with connecting to the database and realize now I wasn't connecting at all.

I'm trying to deploy a Dash app onto Heroku that is connected to an external PostgreSQL database. I've tried to use the heroku-postgres addon but I don't quite understand how that works, and I think it also won't have enough space for the data I need. I currently have an external PostgreSQL database I'm using and I've gone through the steps to attach/detach/config:add the new DATABASE_URL.

Would appreciate any suggestions for connecting remote databases to Heroku