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Your database is definitely corrupted. You can try signing out from More => Settings => Accounts, under the Kobo account sign out and then sign back in. This will replace the database with a blank one and all your sideloaded books will be re-imported along with any books in your Kobo account. All highlights, notes, and annotations will be lost.
I would strongly suggest setting up Kobo Utilities to automatically backup your database in future to make it easier to recover from a corrupted database.
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