code: def get_asset_classes_for_security(self, namespace: str, symbol: str) -> List[AssetClass]:
          
          full_symbol = symbol
          if namespace:
              full_symbol = f"{namespace}:{symbol}"
  
          result = (
              self.session.query(AssetClassStock)
              .filter(AssetClassStock.symbol == full_symbol)
              .all()
          )
          return result
docs: Find all asset classes (should be only one at the moment, though!) to which the symbol belongs