old_contents: 
  
  from django.contrib import admin
  
  from .models import (
      AppOAuthCredentials,
      Group,
      User,
      UserPermission,
  )
  
  admin.site.register(AppOAuthCredentials)
  admin.site.register(User)
  admin.site.register(Group)
  admin.site.register(UserPermission)
  
new_contents: 
  
  from django.contrib import admin
  
  from .models import (
      Group,
      User,
      UserPermission,
  )
  
  admin.site.register(User)
  admin.site.register(Group)
  admin.site.register(UserPermission)
  
subject: Remove unused model OAuthCredentials