Cool, statistics is not something I want to approach yet, but I would very likely make the system use the existing structure from FBDj so that existing stats pages could be used... using Datomic as an alternative after the glowing reviews from my firm's CTO is a tempting prospect, though, as this would allow more fully featured comparisons, such as how much a player has improved.
As for MDS, etc., that's not really something for my program to be too concerned with, luckily, as it's more of a concern for the utilities that generate the missions such as DCG.
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