Hi @Mikein, according to Prestashop tables related to statistics, and unecessaries collected data we strongly recommend to unistall following modules if you use an external analysis system like Google Analytics. Because somes data will be redondant, and made the dabase growing with huge data.
- pagesnotfound
- statsdata
- statslive
For ps_stock_mvt nul or 0 values are normal when you add or remove stock quantity, you create an entry with no order reference. If you disabled stock managment this table is no more used.