Update main.py

main.py

@@ -323,7 +323,7 @@ async def save_data(
             data["retrieved_text"].append(item.retrieved_text)
             data["model_type"].append(item.model_type)
             data["reaction"].append(item.reaction)
-            data["timestamp"].append(timestamp or datetime.now(timezone.utc).isoformat().replace('+00:00', 'Z'))
+            data["timestamp"].append(datetime.now(timezone.utc).isoformat().replace('+00:00', 'Z'))
         
         try:
             # Load existing dataset and merge