old_contents: from django.contrib import admin
  
  # Register your models here.
  
new_contents: from django.contrib import admin
  from django.contrib.admin import register
  
  from .models import MatteImage, MatteRendition
  
  
  @register(MatteImage)
  class MatteImageModelAdmin(admin.ModelAdmin):
      pass
  
  
  @register(MatteRendition)
  class MatteRenditionModelAdmin(admin.ModelAdmin):
      pass
  
subject: Add Matte models to admin