You can get some products that will export event logs as syslog,
That's just plain formatted text so you can manipulate it into a data base or search the formatted text directly for the login events.
I'm reasonably sure usernames are sent with the syslog. But don't have a system in front of me to check.
I didn’t fight my way to the top of the food chain to be a vegetarian…
Im sick of people saying 'dont waste paper'. If trees wanted to live, they'd all carry guns.
"The inherent vice of capitalism is the unequal sharing of blessings; The inherent vice of socialism is the equal sharing of miseries."