记录Django网站的在线用户快照(postgresql后端，nginx webserver)

In a Django + postgresql website of mine, I need to publicly show all is online at a point in time (it's a social website). How do I do this? For instance, can there be a way to enumerate all logged in users who hit my nginx webserver in the previous 10 mins? Something like that could work. I'm a beginner and fishing for a viable solution at the moment. In a Django + postgresql website of mine, I nee