Unless you have a recent backup of the database, that is the best solution. The only other is to do a factory reset. Unfortunately, there are a few things that can corrupt the database. About the only one that is in our control is to make sure the device is safely ejected after connecting to a computer.
And, again unfortunately, you didn't have to go back to 2015 for that advice. The question is posted most months here and the Kobo forum.
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