Update admin_routes.py

admin_routes.py

@@ -20,7 +20,7 @@ from config_provider import ConfigProvider
 from logger import log_info, log_error, log_warning, log_debug
 from exceptions import (
     RaceConditionError, ValidationError, ResourceNotFoundError,
-    AuthenticationError, AuthorizationError
+    AuthenticationError, AuthorizationError, DuplicateResourceError
 )
 
 # ===================== Constants & Config =====================