I read that ory kratos supports registration and user profile, does it mean all the user details should be in kratos db, or should they be saved in app db and just minimal profile details in kratos? What is the recommended approach. I guess we could either, but keen to know what do people do in general?

#following

Traits can be modified by the user, so they are useful for storing user attributes that the user has full access to read and modify, such as their first/last name, phone number, etc. Sensitive attributes that could control whether a user has access to perform elevated privileges, such as an "admin" flag or role should not be stored as traits.