The added_at field is in the metadata_items table, just like your sql statement is written. Did you get some kind of error when you ran that statement?
Thank you for the quick response.
No, i did not get any error from sql, but after i re-start PMS with the new database, the files still seemed out of order.
I then did it again, but this time PMS crashed every time i tried to open Plex.
I am busy re-building my database, thanks to 100Mb/s internet, it is not taking that long.
I shall try to do it again after the re-build and let you know, should be within the next 45 min.