old_contents: from django.contrib import admin
  from .models import DoorStatus
  
  @admin.register(DoorStatus)
  class DoorStatusAdmin(admin.ModelAdmin):
      fieldsets = [
          ('Status', {
              'fields': [
                  'name',
                  'datetime',
                  'status',
              ]
          })
      ]
      search_fields = [
          'title'
      ]
  
  @admin.register(OpenData)
  class OpenDataAdmin(admin.ModelAdmin):
      fieldsets = [
          ('Data', {
              'fields': [
                  'opened',
                  'closed',
                  'data',
              ]
          })
      ]
      search_fields = [
          'opened'
      ]
  
new_contents: from django.contrib import admin
  from .models import DoorStatus, OpenData
  
  @admin.register(DoorStatus)
  class DoorStatusAdmin(admin.ModelAdmin):
      fieldsets = [
          ('Status', {
              'fields': [
                  'name',
                  'datetime',
                  'status',
              ]
          })
      ]
      search_fields = [
          'title'
      ]
  
  @admin.register(OpenData)
  class OpenDataAdmin(admin.ModelAdmin):
      fieldsets = [
          ('Data', {
              'fields': [
                  'opened',
                  'closed',
                  'data',
              ]
          })
      ]
      search_fields = [
          'opened'
      ]
  
subject: Fix import error