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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.
I think JSON is used reasonably often under the hood for various things in Unity, I certainly use it in all my games. The builtin JSONUtility can do the job, but there are some edge cases (serializing lists without a base class, for example) where it falls over. LitJSON is a simple but comprehensive option if you need more power.
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