old_contents: from django.contrib import admin
  from fccdata.models import *
  
  admin.site.register(am)
  admin.site.register(en)
  admin.site.register(hd)
  
new_contents: from django.contrib import admin
  from fccdata.models import *
  
  class enAdmin(admin.ModelAdmin):
      list_display = ('call_sign','first_name','last_name')
      search_fields = ('call_sign',)
  
  class amAdmin(admin.ModelAdmin):
      list_display = ('call_sign','operator_class')
      search_fields = ('call_sign',)
      raw_id_fields = ('unique_system_identifier',)
  
  class hdAdmin(admin.ModelAdmin):
      list_display = ('call_sign','license_status','expired_date')
      search_fields = ('call_sign',)
      raw_id_fields = ('unique_system_identifier',)
  
  admin.site.register(en, enAdmin)
  admin.site.register(am, amAdmin)
  admin.site.register(hd, hdAdmin)
  
subject: Include improved admin setups for the three main models.