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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.
They offer a Postman collection so you could use Postman to quickly generate the client code you would need to call the API using iOS's URLSession (the the generated code does look a little ugly). The API docs include the endpoint responses. Using an app like CuteBaby, you can quickly create models.
NOTE:
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