I have been in this (frustrating) place… and while there can be many causes, here are two threads that helped me through the weeds with similar “my db isn’t being created” issues:
and
Since you’re also using Postgres, I’d suggest also considering pgAdmin
It’s included in the prebuilt downloads here if you don’t already have it: PostgreSQL: Downloads
DataGrip offers some great features, but if you’re just using it to check Wappler’s work … the database diagramming tool in pgAdmin is awesome for that, and pgAdmin is delightfully free! ERD Tool — pgAdmin 4 8.6 documentation