I tried it yesterday, after some fiddling with the database function i got everything from edd imported (notes...) then i did add some stars and wondered "why the hell is there no zero? i want to add F0/G0... Stars"
Then i figured out its the amount of Stars per System not the Class.... that did disappoint me a bit

For Data collecting its imo more interesting to know the exact Star-class than how many there are in 1 System, do you think adding that would be possible? (maybe move the amount to the right top corner of the Star just like a potency sign? like K² and the Class number like the amount now in the center of the Star sign? - or the other way)
Hmm. That would require some radical changes to the database structure, as in, I only keep counts of the general star class. I wanted to keep the DB structure as relatively simple as possible. The only thing I can suggest is, if you really want to go into that level of detail, then the System Notes would be the place to store detailed information. That way, when you export to CSV, this info is put into the System Notes column of the exported CSV file - and from there you could write a macro to count by star type ("G0, F0" etc) based on what you wrote in the System Notes.
System Notes are unique to each system, so what you put in there will reappear any time that system is jumped into.
Then there's Jump Notes, which are unique to each jump entry.
Accounting for each and every exact star class looks like quite the Herculean task
Perhaps in the future, FDEV will deign to produce a decent API, from which I can suck that information out for a given system - then that'd be more easy to do. But for now, when the only information I can glean from the game is "which system you jumped into" and "when it happened" - as that's more or less the only useful (to us) entries in the verbose netlogs, then I think I'm keeping CL the way it is now. It would be a lot of work to add this in myself, only to find somewhere down the line a shiny new ED API is released which negates that work I did to add exact star classes
Regards