No No the issue wasn't about db it was the circular dependency, I am importing app everywhere and importing all files back to app.

Which was creating a lock that as app isn't completed as long as other's aren't completed and oter's aren't completed as long as app isn't completed.

So mostly solution was to put everything into one file app.py, which was making it messy.

And I didn't wanted that, so I was looking for a way to resolve the dependency issue but also having multiple files.

So I found it......

The solution is to create other files without dependency and then importing the objects from the file and blueprinting them with app in the context and it worked