@danrou Same thing happened to me with the recent automatic update on October 5 2023. All of my saved bookmarks, history, cookies, everything was completely wiped.

I've been using Opera for many years and a recent automatic update on 10/5/2023 removed all of my history, bookmarks, saved settings, etc. I opened the browser as usual, the update was applied, and all of my saved data was wiped. I have no idea why this happened and I need help recovering my saved data. If anyone else has had this experience or knows how I can recover or revert back to a previous version, please help.