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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.
I have heard good things about dbottons tutorial series, though i havent used it myself. Its available here: https://github.com/rabbibotton/clog/blob/main/LEARN.md
For CL resources, look at this reddit sidebar and here: https://lispcookbook.github.io/cl-cookbook/ in "Other resources", then use the Cookbook when you have a practical need. See also its page for editors (warn: the VSCode plugin is currently not super easy enough to install).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.