Here were the instructions I was given to reimport djay one data.
It appeared to work for me. Note I was trying to get samples back but I think this is also what brought back my history.
"delete the "djay Pro" folder inside your "Music" folder to enable re-importing data from djay Pro 1. This folder contains data from djay Pro 2 only, so deleting this folder will have no effect on your djay Pro 1 data.*"
then import data from Djay 1.
Note if You have a whole bunch of new data in DJay 2 you need this may not be for you. But if you just barely fired up 2 there should not be much there.