old_contents: from django.contrib import admin
  from lava_scheduler_app.models import Device, DeviceType, TestJob
  
  admin.site.register(Device)
  admin.site.register(DeviceType)
  admin.site.register(TestJob)
  
new_contents: from django.contrib import admin
  from lava_scheduler_app.models import Device, DeviceType, TestJob, Tag
  
  admin.site.register(Device)
  admin.site.register(DeviceType)
  admin.site.register(TestJob)
  admin.site.register(Tag)
  
subject: enable tags in the admin interface