feature request: reporting around aggregate intervals?

[spencersevilla]

If I understand haulage correctly, it logs all the bytes sent/received by a user and updates the customer table every (interval) seconds. I think it'd be super useful to enable some way for us to tease out aggregate information (e.g. bytes consumed in last 5mins/10mins/30mins/hour); both for individual users as well as the whole system. Not the most urgent thing on earth but definitely a "nice to have" item.