old_contents: from django.contrib import admin
  
  from .models import LilyUser
  
  admin.site.register(LilyUser)
  
new_contents: from django.contrib import admin
  
  from .models import LilyUser, LilyGroup
  
  
  admin.site.register(LilyUser)
  admin.site.register(LilyGroup)
  
subject: Add LilyGroup to admin