content: from rest_framework.exceptions import APIException
  
  
  class ServiceUnavailable(APIException):
      status_code = 503
      default_detail = "Service temporarily unavailable, please try again later."
  
  
  class SerializerNotFound(Exception):
      pass
  
  
  class GraphQLTypeNotFound(Exception):
      pass
  
  
  class QuerySetNotOrdered(Exception):
      pass
  