There are plenty of times in my career when I’ve stored a boolean and later wished I’d had a timestamp. There are zero times when I’ve stored a timestamp and regretted that decision.
Hear hear! Over the years I’ve come to include 9 meta fields for most of the tables I create: added_at, added_by, added_ip, edited_at, edited_by, edited_ip, deleted_at, deleted_by, and deleted_ip. Handy for whenever you receive a phone call saying that a record has disappeared, allowing you to pinpoint it to a user and a specific timestamp.