Hi Sam,
I do not go into the management of your 270,000 qso log and I try to solve your problem in modifying all your log archive to have set the flag of the eqsl_sent field as sent to the eqsl.cc site
The technique is to use the possibility of Logic for massive changes by specifying the range of applicability and the data you need.
You need to go to Tools \ Advanced \ Database Commands
The first thing you need to do is open the log by making it active.
Then access the Replace fields contents option in Mass Change.
In the form that opens you have to choose the field to be modified or eqsl_sent and in the next box you have to enter what you have to replace or the confirmation of the shipment that will be carried out by putting .T. (dot and letter T in upper case and dot again). You can see in my screenshot.
Before confirming with OK you must click on the icon at the bottom right with the description "count records to be acted upon" so that you can see without executing the command how many records will be modified. Obviously, before doing all this, I recommend that you make a good copy of the Logic directory, if something then goes wrong.
I hope I have been of help and above all that I have been understood with my poor English. Any clarifications are available and perhaps ultimately assuming a remote connection. (Now I said it really big hi hi hi).
I authorize Dennis to kick me out of the forum if I have given false and biased information.
A cordial greeting.
Mauro IKØCHU
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IKØCHU Mauro