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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.
As a side note you cannot do JSON, since it cannot do "int" keys. I tested vmihailenco/msgpack and it works fine - you can try that if you want a JSON-like experience.
NOTE:
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