Question: Data used for graph?

[cdolfi]

I just discovered this project today and did not know the best place to ask a question (let me know if I should put this elsewhere). What data is being put into the network graph? I was reading the README and it says only data from a few years ago but when playing with the web ui I saw posts more resent. Is this now on data being constantly updated? If so is there a place where I can look through the code. Curious to learn more!