Hi @mayrsascha, welcome and thanks for asking here.
From what I see, you must properly configure your application with your database on Qovery. You can follow this guide.
I went with the first option, since I am not that experienced with Terraform and want to keep my deployment complexity low.
Creating the database worked as intended, just had to create some aliases for the auto-generated environment variables to give my application access to the database, since it’s expecting the ENVs to be called a certain way. BTW, the database password was NOT automatically set for my application, I had to add that ENV manually, just FYI. The database password is also automatically set, just as a secret variable instead of an environment variable, so I didn’t see it in the UI at first.