old_contents: from django.contrib import admin
  
  from .models import Subscription
  
  admin.site.register(Subscription)
  
new_contents: from django.contrib import admin
  
  from .models import Subscription
  
  
  class SubscriptionAdmin(admin.ModelAdmin):
      list_display = (
          'id', 'identity', 'messageset', 'next_sequence_number', 'lang',
          'active', 'completed', 'process_status', 'created_at', 'updated_at',)
      list_filter = (
          'messageset', 'lang', 'active', 'completed', 'process_status',
          'created_at', 'updated_at', )
      search_fields = ['id', 'identity']
  
  admin.site.register(Subscription, SubscriptionAdmin)
  
subject: update admin view