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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.
For Webservers, there is more choice: https://github.com/CodyReichert/awesome-cl#http-servers like Woo (async), but Hunchentoot is the most common choice. There are frameworks focusing on REST services, but building one's own JSON routes works. No experience with SSE.
NOTE:
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