Merge branch 'staging' of https://gitlab.com/tangibleai/community/mathtext-fastapi into staging

mathtext_fastapi/nlu.py

@@ -20,7 +20,6 @@ PAYLOAD_VALUE_TYPES = {
     'message_id': str,
     'message_inserted_at': str,
     'message_updated_at': str,
-    'message_inserted_at': str,
     }
 
 
@@ -181,8 +180,7 @@ def payload_is_valid(payload_object):
         isinstance(payload_object.get('message_direction'), str) and
         isinstance(payload_object.get('message_id'), str) and
         isinstance(payload_object.get('message_inserted_at'), str) and
-        isinstance(payload_object.get('message_updated_at'), str) and
-        isinstance(payload_object.get('message_inserted_at'), str)       
+        isinstance(payload_object.get('message_updated_at'), str)    
     )