Thanks theducks, it was the Modified {last_modified} column I was not sure about. I wanted to know what I'm allowed to do before the record is updated and where to find this information.
You say ANY change... It means that if my record was last modified e.g. on 10 Jan 2018 when I edited the epub, and today I insert a comma in the Title column I found missing in the name of a book, the important date 10 Jan 2018 will be updated and lost because of this unimportant comma, and I cannot do ANYTHING about it except stop using this column completely.
It is quite useless column because initially EVERYTHING there has the same date as the Date {date} column even though the record was actually never modified...
Fortunately I can create my own column called e.g. Edited which will keep the date I want there.
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