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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.
I had a discussion about this on Kotlin forums and made some arguments here. Also, if anyone is interested, I implemented OptionalValue utility that makes easy to handle double nullability. It doesn't have any dependencies on the rest of the project, so you can just copy & paste it.
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