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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.
The library is at https://github.com/anarthal/mysql and the documentation is at https://anarthal.github.io/mysql/. Examples under https://anarthal.github.io/mysql/mysql/examples.html.
Things that have been accepted into the C++ standard for decades. For instance, ASIO is a completely standalone library, but look at what happens when you get ASIO from boost: https://github.com/pdimov/boostdep-report/blob/master/boost-1.75.0/asio.html
NOTE:
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Hence, a higher number means a more popular project.