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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.
JSON5 to the rescue!
For config file use case I cannot recommend enough TOML.
Originall, written in/for java but many ports exist: https://github.com/lightbend/config
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