Update schemas.py

schemas.py

@@ -11,4 +11,7 @@ class SentimentResultCreate(SentimentResultBase):
 
 class SentimentResult(SentimentResultBase):
     id: int
-    created_at: datetime
+    created_at: datetime
+
+# Ensure SentimentResult inherits from BaseModel
+SentimentResultBase.update_forward_refs()