[John Maverick]

I hope I'm not intruding this thread with a question that is only barely related to FFF.

Yesterday I added the columns "update errors", "save metadata" and "checked" to a Calibre library with 30K of books downloaded with FFF. The problem is that after Calibre restart, the column "last_modified" for all the books was changed to yesterday date. So now I can't use that column to sort my books for last updated (or at last last changed).

There is some way to recover the original values of "last_modified" column?

I do have backups of my library, but I was hoping to use them as a last resort.

Also, there is some way to add new columns to a library without changing the last_modified column?

Thanks in advance.