Originally Posted by Xenophon
Only update book files where the database metadata is newer than the book file.
Currently, AFAIK, there is no "date" on individual pieces of metadata. There is a "date" on individual records, but it isn't updated with metadata updates. The whole database has a date, but that date isn't very relevant to the books or individual pieces of metadata.
I don't see how you can do this without new db fields to track these dates.