My low tech solution is to keep all of my books in calibre and when I finish a book or decide it's not worth finishing I delete it from the e-reader. Some time later I connect the e-reader to my pc and sort by On Device in calibre; any that are in Calibre but aren't on the e-reader are finished so I add a tag "finished" to them in Calibre. In calibre I also have a virtual library named unread where its search expression is not tags:"=finished". The one wart with this scheme is that when Calibre starts it shows all of the books whereas I'd rather have it start with virtual library named unread. If you go this route you may also want to add the Virtual library button to the toolbar.
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