Surpassing 15 Star Tyrant Equip

SaptaZapta; I'd assume that they keep the Star Force table seperate from the main equipment table... sort of like a delta table where it keeps track of the stars and stats without affecting the main equipment.. and then the server itself will calculate the total stats and display it.

In which case, what happens when you use Star Force on an item that had some pre-SF stars on it, and it booms?
Does the trace include the old stars, but not the new?