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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.
Scalar objects has a prototype implementation since at least 2015: https://github.com/nikic/scalar_objects/issues/20
Dan Ackroyd's RFC Codex has some good write-ups on commonly requested features.
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