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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.
You should check out uthash, which has an extensive test suite and documentation (the user guide), to see how a library like this one that's used in the real world is written, tested, and used: https://github.com/troydhanson/uthash/tree/master/tests
NOTE:
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Hence, a higher number means a more popular project.