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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.
Their site has a ton of example code for various uses, using the base library through its native C API. There's also a C++ wrapper available called raylib-cpp, with doxygen-generated documentation.
Personally, I think I'd go through the C raylib examples, the using Raylib with CPP page, and the raylib-cpp documentation and start trying to port some example code, then take the C++-ified examples and start experimenting.
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