No, there isn't. You've already asked this in several other threads and I answered in another as well.
Preferences > Advanced > Check Database Integrity checks the db and fixes errors, but there's no way to rebuild from the directory. The only way would be if you'd done a Save to Disk on all your books and then you can re-import them.
That's why it's always a good idea to back up your data, which includes the db file.
Hope this helps.
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