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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.
However null checks for Unity objects are slow compared to standard C# classes, see this link for a brief explanation, there are also many discussions about this on the Unity forum. Not sure though, if that is still true for recent Unity versions.
NOTE:
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Hence, a higher number means a more popular project.