Recover filemanager after db rollback - possible?

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I'm not sure if "installation help" is quite the right place to ask this, but here's the skinny. I do Concrete5 training for a college/administrative audience. I have a training website/db that I use for the class, and it's easy to just roll-back the db to a 'known-good' configuration before each class.

However, this breaks all of C5 db linkage to files that have been uploaded. Is there a way to 'rebuild' these db links, since the files really are still on the server in the 'files' folder. C5 just doesn't recognize this.

Thanks!
--Rob