django extend user model

reference:
https://simpleisbetterthancomplex.com/tutorial/2016/07/22/how-to-extend-django-user-model.html
https://stackoverflow.com/questions/49189402/auth-user-groups-fields-e304-reverse-accessor-for-user-groups-clashes-with
https://wsvincent.com/django-custom-user-model-tutorial/

OneToOneField
https://stackoverflow.com/questions/5870537/whats-the-difference-between-django-onetoonefield-and-foreignkey

Model instance
https://docs.djangoproject.com/en/2.2/ref/models/instances/

ArrayField
https://docs.djangoproject.com/en/2.2/ref/contrib/postgres/fields/#arrayfield