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To elaborate - a book's Last Modified can get updated 'unexpectedly' - e.g. if you changed a tag name from "Antebellum" to "Pre-1861" all the books tagged "Antebellum" would have their Last Modified Dates set to current timestamp - i.e Now.
I have a Last Action/#last_action_date custom column. I edit metadata in the book list cells, so it's easy to maintain.
BR
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