Add error handling to api_query_dataset function

main.py

@@ -87,7 +87,7 @@ async def api_query_dataset(dataset_id: str, n: int = Query(default=10, ge=1, le
 
     except Exception as e:
         logger.error(f"Error querying dataset {dataset_id}: {str(e)}")
-        raise HTTPException(status_code=500, detail=str(e))
+        raise HTTPException(status_code=500, detail=str(e)) from e
 
 
 if __name__ == "__main__":