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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.
One of the things that I really like about the "M" formula language used in Power Query is the ability to functionally express such mappings, and a graphical environment for creating the expressions. Because your post got me curious about using M from C#, I did some Googling and found this: https://github.com/gsimardnet/PowerQueryNet. I sure the project would benefit from other developers/contributors.
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