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I have three date columns side by side:
Published (I try to set this to first published on paper).
Date. Date added to Calibre
Modified (any change at all can change this and if a shared data, lots of ebooks change).
I'm thinking I need one "Last Sent to ereader", for each ereader so as to know if the Calibre version is changed, so really I also need a "Last changed in Editor or Converted" column too as some info not relevant to an ebook on an ereader can make the Calibre Last Modified date change.
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