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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 did it when I implemented my own C++ hash table, and I was writing one in C as well but I never finished it unfortunately. If you are interested in the logic (and can read a bit of C++ templates nonsense) here's my C++ implementation.
If you want a generic, extremely high performance implementation. I really recommend khash: https://github.com/attractivechaos/klib/blob/master/khashl.h
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