old_contents: # -*- coding: utf-8 -*-
  
  from django.contrib import admin
  
  from anycontest.models import ContestSubmission
  
  
  class ContestSubmissionAdmin(admin.ModelAdmin):
      list_display = ('issue', 'run_id', 'author')
      readonly_fields = ('create_time', 'update_time')
  
  admin.site.register(ContestSubmission, ContestSubmissionAdmin)
  
new_contents: # -*- coding: utf-8 -*-
  
  from django.contrib import admin
  
  from anycontest.models import ContestSubmission
  
  
  class ContestSubmissionAdmin(admin.ModelAdmin):
      list_display = ('issue', 'run_id', 'author')
      readonly_fields = ('issue', 'file', 'create_time', 'update_time')
  
  admin.site.register(ContestSubmission, ContestSubmissionAdmin)
  
subject: optimize admin view contest submission