title: Prestashop change all product quantity to 1
body: <p>Hello i want to change all product quantity on a prestashop to 1 the shop is selling old books and they have only 1 of each but before now it was running on undefined quantity so people ware able to buy a product multiple times so i was tasked with changing that. I guess it should be done in the DB but i am unable to make the query.</p>