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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Speaking of that, there is clojuerl that's pretty actively developed and it's pretty functional now. The author ported Rich Hickey's ants demo to it, so you can definitely do some non trivial stuff with it now.
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