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These are used by the SmartDevice App device driver. The "read sync" column is the lookup name of a yes/no custom column that a "smart app" (e.g., Calibre Companion) is to use when synchronizing its "book read" information with calibre. The "read date" sync column is the lookup name of a calibre date custom column that the smart app is to use when synchronizing its date read information.
By "synchronize" I mean copy the information from/to calibre to/from the app running on the device. Which direction it goes depends on where it was last changed.
Hope that helps.
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