@Kumajborn - use the Reading List plugin. You can set it to either populate a custom column or to maintain a tag every time the device is "synced" using the plugin, once you set a list up of the appropriate type. The tag/custom column value will remain until you next remove the book from the device and "sync" the list again. You can setup the list syncs to take place automatically when a device is connected, so the tags/custom column values magically update without you having to do anything.
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