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That is not something you should do.
A model is the single, definitive source of information about your
data.
This implies that the model can’t be different for every single entity (the user in this case) in your app. A definitive source for your data should not have to be unique for every user.
For more on Django models: https://docs.djangoproject.com/en/1.10/topics/db/models/
Source:stackexchange.com