refactor(api): remove dead code

api/desecapi/serializers.py

@@ -20,7 +20,7 @@ from rest_framework.settings import api_settings
 from rest_framework.validators import UniqueTogetherValidator, UniqueValidator, qs_filter
 
 from api import settings
-from desecapi import crypto, metrics, models, validators
+from desecapi import crypto, models, validators
 from desecapi.models import validate_domain_name
 
 
@@ -103,17 +103,6 @@ class TokenDomainPolicySerializer(serializers.ModelSerializer):
             raise serializers.ValidationError(exc.message_dict, code='precedence')
 
 
-class RequiredOnPartialUpdateCharField(serializers.CharField):
-    """
-    This field is always required, even for partial updates (e.g. using PATCH).
-    """
-    def validate_empty_values(self, data):
-        if data is serializers.empty:
-            self.fail('required')
-
-        return super().validate_empty_values(data)
-
-
 class Validator:
 
     message = 'This field did not pass validation.'