You might need to changw the PostgreSQL Version if you are still on an oder one. Roll back to 2.x, make sure it runs, edit the App to use the new PG, Start, Update to 3.0

GrapheneOS can be used just fine without any Google Services. This is one of the core features.

As a next step they should have wrapped everything in a true(while) loop so it automatically restarts and the program never dies