We keep SOME "history" items. Mostly they are records of fines and problems on people who have shown themselves to be, ah, less than reliable (shall we say?). Other than these few (and they ARE few), we only keep records such as is described above. The information on the "last user" is kept for three days so that if problems are found with a book we can contact the person who last had it out, but after that or when someone else borrows it that information is overwitten.