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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.
Source code and manual, Github
Its core (as in, the very base of hit objects logic and some parts of architecture) is based on osu-ds, an unfinished osu! port to Nintendo DS made by Echo in 2009 and released under the BSD-2 license.
NOTE:
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