C subnet statistics
Write a plugin that gathers statistics (amount of data, possibly number of connections) for each /24 (or /48 for IPv6) subnet we communicate with. This would allow modelling how much data goes through which place on the Internet or if it is dependent on time. It would also allow to show a heatmap of countries the user communicates with (like we have with firewall attacks).
It would be better to do it on per-AS basis, but that is much harder, so the prefixes seem like a reasonable compromise (likely, ASes are not smaller than this, so we could construct them on the server instead of performing huge amount of whois queries on all the routers).