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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.
3) (From further research, not directly linked from that article, as it's newer than that article's publish time) Do the same as #2, but instead of using the paid Newtonsoft packages for the validator Function App, rewrite the provided code to use the json-everything JsonSchema.Net package, which is distributed under the MIT license and can be used freely in your project.
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