Dependency on Flask-SQLAlchemy

Hi Jean,

As far as I can tell, I don't see any part of the code here that actually requires Flask-SQLAlchemy. I'm currently using it in a project that doesn't use Flask-SQLAlchemy without any problems (Thanks! 😄). However, because the project depends on the Flask-SQLAlchemy package, it gets installed along with my package even though it's not necessary.

I was also hesitant to use the project at all, since I initially thought it would be Flask-SQLAlchemy-specific.

Would it be possible to remove the dependency on Flask-SQLAlchemy, or could you point out the part of the code that depends on it?

Thanks!