I'm wondering if I've found a bug in "Database update" or if I'm not using it correctly.

Okay, here's what I'm doing. I'm importing an ADIF file with a handful of QSOs from another logging program (JT65-HF). These QSOs don't have names or qth's on them. To have CQRLOG go out and find the names from HamQTH, I go to the Callbook menu, and select "Database update".

I get prompted if I really want to run database update, and I click "Yes".
I get prompted asking if I want to update names from previous QSOs. I don't want to update the names for every QSO (and some of them the names have changed since I have a couple SKs in my log), I just want to update the QSOs that don't have names. I click "No".

Then CQRLOG displays a dialog that says "Updating QSO with" and has a callsign. It goes through every callsign in my log. What is this processes doing, exactly? Is it actually modifying QSOs in my log (the cqrlog_main table), or is it maintaining a separate table? It doesn't seem to change the names of ALL my QSOs, but there are updates on a couple of QSOs, and these are ones that did have names before. I added a field to the MySQL database which contains the current timestamp of when the row was updated, so that I'm able to see if a QSO has been modified.

So... my question is, A) what is database update doing, and B) what exactly does "previous QSOs" mean in the prompt? What if I only want to run database update on highlighted QSOs, would that work?

I'm using 1.4.1 on Xubuntu 11.10 if that helps.