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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.
If you indeed decide to migrate to C#, here is an excellent tool to help you automate the process and do much of the tedious work for you: https://github.com/icsharpcode/CodeConverter Its not perfect, but it alleviates most of the manual work.
NOTE:
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Hence, a higher number means a more popular project.