I think it’s pretty a risky task that the query we provide you and you use it on your database. So, before doing it on live site, you need to test it on the development stage site. And we think you need to clone it before doing it. If you have 500 items, better to do it manually instead of doing it because you need extra hours to clone the site and test it. Better to contact with here, so that our core developer will answer you on it.
Regards,
Acme Supports