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One item to remember is that the database in memory and the database on the storage are loosely consistent. For speed, the storage copy is updated from the RAM copy when a certain amount of data has been written. An unexpected power outage can cause this mechanism to fail when not all the data is written. As many posts in these and other forums have mentioned, the battery gauge is not all that accurate so I try to avoid having the charge level drop below 10% before connecting to a charger.
I would suggest a restart before connecting to calibre which will write the database to storage and ensure that it is closed before the connection.
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