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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.
After you're done with the high level concepts I'd suggest digging into some demoscene material - Ye old pirates of the Demoscene gave rise to SIGGRAPH... Many high performance tricks and tips are shared amongst the scene. A lot of it is oldschool knowledge, but there's a lot of demos for new stuff platforms today. Hell, there's even JS demos using WebGL.
If you're looking for a library written in C that handles UTF-8 encoded text, I wrote utf8rewind after reading the tome Unicode Demystified cover to cover. 😉
header: https://github.com/Rismosch/risEngine/blob/main/code/modules/risData/risString.h