Update app.py

app.py

@@ -57,7 +57,7 @@ for row in marks_data:
 
 # --- Define SQL tool ---
 @tool
-def sql_engine(query: str) -> list:
+def sql_engine(query: str) -> dict:
     try:
         with engine.connect() as con:
             rows = con.execute(text(query))
@@ -67,6 +67,7 @@ def sql_engine(query: str) -> list:
     except Exception as e:
         return {"columns": ["Error"], "data": [[str(e)]]}
 
+
 # --- Table descriptions ---
 inspector = inspect(engine)
 updated_description = "Ask natural language questions about the student marks database.\n"