old_contents: from librement.utils.user_data import PerUserData
  
  class Profile(PerUserData('profile')):
      pass
  
new_contents: from django_enumfield import EnumField
  
  from librement.utils.user_data import PerUserData
  
  from .enums import CountryEnum
  
  class Profile(PerUserData('profile')):
      country = EnumField(CountryEnum)
  
subject: Store a user's country.