@julia5: That message means the database is corrupt. The device will probably keep running. It is using an in-memory copy of the database and cannot write to the database safely. If something happens that the database has to be reread, such as restarting the device, you will see problems. In this case, you will probably lose collections or see other problems with the collections. But, you might lose the reading status for books, annotations or have dismissed tiles reappear on the home screen.
This won't fix itself. I outlined the solutions. But, if you want to get out an SQLite database management tool, you can have a look.
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