I now have all my books on my new Nexus 7 LTE. I wanted all the same books that I had on my old Nexus 7 so I created a custom yes/no column and valued it as yes for all books on the old Nexus. I added all these books on my new Nexus using the wireless connection and it only took a few minutes for 400 books. I then went and updated the custom column to "no" so all the books had the last_mod date updated and then deleted the custom column. I then connected wirelessly to update the metadata, but the custom yes/no column is still in my book details. Is there a way to remove this? I have Calibre 1.2 and CC 3.1.1c
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