python - Change to Django's User Model - Migration issues -

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i have used own user model till , realized django's user model offers me things have create on own... why not take django's user model..

now changed user model , made inherit django user model adding: 

class user(user)..

and tried migrate db these steps: 

1. python manage.py schemamigration home --auto -- asked me give default values these 2 columns mean down here 2. python manage.py migrate home 3. error

3.error says user_ptr_id exists double , thats why couldnot create unique index user_pkey.

what can can migrate?


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