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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.
There's also https://github.com/clojure/core.typed Typed Clojure
Hopefully specs are ending up in an s/fdef rather than a comment. Sadly no editor integration yet but I know /u/borkdude did some experiments looking at integrating this with clj-kondo here https://github.com/clj-kondo/inspector/. I'm not sure what the final verdict was for feasibility.
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