Looks awesome! One data issue I've seen go relatively unaddressed in the Clojure community is the serialization of big matrices and arrays.

There's a start on a clojure hdf5 (hdf5 is a container format common in scientific circles) implementation, but it's a long ways from done. https://github.com/clojure-numerics/clj-hdf5 I'm not the author, but I am the negligent steward.

I'd love it if someone smarter / better at Clojure than me was interested in helping to think about useful, idiomatic high-level abstractions on top this high-performance data store.

PyTables does a great job of making gobs of hdf5 data easy to work with for analysts--I'm just too novice at Clojure/FP to know what is a reasonable analogue for Clojure.