Any kind of activity graph mod?

[Outlaw Mantis]

I'm having trouble finding something like this. Basically, I'm looking for a mod that will generate a graph by counting posts and post times made in the entirety of the forum's existence, or maybe a date range. I realise this would be very resource-heavy, and perhaps something that could be run manually while a forum is offline.

I'm just interested in a more accurate look at the periods when my forum was more active, and times when it had a bit of a "post drought" so I can figure out why that was.

I guess this is a bit of an odd request so I wouldn't be surprised if nothing of the sort exists, but thanks for reading.