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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.
https://github.com/ppy/osu-tools/ Take a look at this. I don't know if this is the official sr/pp system but it has diff/pp calc for all modes and you can also set the clock speed (1.0 for nm; infer other values) which you could simply multiply by 2/3 (you'd have to be able to code in c#, although at a pretty basic level)
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