@Chaley,
The issue is the {last_modification} field is wrong (a mistake from me somewhere, don't know what,when, and why). So I need first to restore them.
I created a new column to be able later to eventually choose the MAX({last_modified}, {timestamp}) for that column, as indicated in my answer to BetterRed.
And this date will be shown in file system as modification date for books (my last bash script above does this).
br.
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