Is your feature request related to a problem? Please describe.
During the development phase, any mistake in the model forgives nothing. Any error in a field name, type or mandatory can't be fixed. This is extremely painful and reduces flexibility.

Describe the solution you'd like
Add ability to rename and updating the mandatory aspect of a field would be an appreciated minimum.
Ideally, deleting, renaming, changing type etc should be made possible.

I understand that this option can cause issues for existing users but this can be made visible by activating "Show dangerous actions" in the menu and hidden by default