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Even if you split models into multiple files, you still need to create a ‘models’ package in your app, the project structure could be,
--app
----models
------__init__.py
in init.py,you need to import the model classes and set them into globals, you can do it manually or dynamically, e.g.,
from auth_* import XXXModel
current_global = globals()
current_global[XXXModel.__name__] = XXXModel
then, python manage.py sql can find the model schemas.
Source:stackexchange.com