Add new web_api expression column called expression_copy of type expressionStringType Copy over original web_api expression column into expression_copy update web_api set expression_copy = expression Drop original web_api expression column Rename web_api expression_copy column to expression Add new web_api_history expression column called expression_copy of type expressionStringType Copy over original web_api_history expression column into expression_copy update web_api_history set expression_copy = expression Drop original web_api_history expression column Rename web_api_history expression_copy column to expression