Updating 3.06 to 3.09

[DeusIX]

I just recovered from a server crash and found your version of utstatsdb. I managed to get my 3.06 stats to run on a vm, but I want to test the latest with php 7 support.

from INSTALL.txt:

If you are upgrading from UTStatsDB 3.06, a new installation is highly
recommended, rather than attempting an update. If you do perform an update,
rather than a new install, certain special event data like player headshot
counts may not be transferred to the new database structures.

Is there a Update script available so that it can be updates, or should I do one myself?
Do you have a list of these "certain special events"?