I think it's probably only a few lines so I could do that, if you can tell me exactly how you want to calculate it. Do you want it to be a "lifetime" value? Hopefully that's OK because it's easy enough to get the time since a user joined and the total posts since they've joined, otherwise it gets more difficult. But one issue with it being a lifetime value is that it of course gets harder and harder to change as time goes on.
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