Missing Notes

I'm using Zotero for quite a while now, but just noticed that lots of older notes I wrote disappeared. That's especially annoying since it would take lots of time to get those books back. Is there any way to recover them? How are they usually connected to the book, like is there some raw database to fix it?
My Firefox crashes from time to time and I "shot" zotero down a few times since it took to long exporting some libraries, so I guess that's what the cause of the trouble is. Well how could I recover the "old" notes? Error ID: 446461742
  • Run your database through the DB Repair Tool. If that doesn't do the trick, send the Upload ID to support@zot....org and, if you can, provide some example text from notes that are missing and the items you remember their being attached to.

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