old_contents: from django.contrib import admin
  
  import web.core.models
  
  @admin.register(web.core.models.File)
  class FileAdmin(admin.ModelAdmin):
      pass
  
new_contents: from django.contrib import admin
  
  import web.core.models
  
  @admin.register(web.core.models.File)
  class FileAdmin(admin.ModelAdmin):
      list_display = ['slug', 'file', 'author', 'created', 'expiry']
      readonly_fields = ['id', 'slug']
      ordering = ['-created']
      fields = ['file', 'expiry']
  
subject: Improve File admin interface