Hmm difficult one. Most easy one would be to create 2 temporary databases:
1. A fresh (empty) install of vBulletin with preferably the same version you are running now.
2. Export your current database with only table structures, no data.
Now do a backup/export of both and do a file compair on the 2 files to find the differences in the table structures between both testdatabases. These are the database changes you will need to do to get your current database in a default configuration again.
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