text: from __future__ import absolute_import
  from django.contrib import admin
  from .models import *
  
  
  @admin.register(Exchange)
  class ExchangeAdmin(admin.ModelAdmin):
  
      list_display = ('exchange_type', 'timestamp', 'user', 'filename')
      readonly_fields = ('exchange_type', 'timestamp', 'user', 'filename')
  
      def has_add_permission(self, request):
          return False
  