old_contents: from rest_framework import serializers
  
  from .models import AuthenticationSession
  
  
  class AuthenticationSessionSerializer(serializers.ModelSerializer):
      class Meta:
          model = AuthenticationSession
          fields = ('application', 'external_session_id', 'session_photo_bytes', 'flag', 'start_time', 'end_time')
  
new_contents: from rest_framework import serializers
  
  from .models import AuthenticationSession
  
  
  class AuthenticationSessionSerializer(serializers.ModelSerializer):
      class Meta:
          model = AuthenticationSession
          fields = ('application', 'external_session_id', 'session_photo_bytes', 'flag')
  
subject: Change serializer to omit dates