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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.
Post complete build log, there can be good clues that someone familiar will catch. Unfortunately I don't know about iOS, but there is an issue here which seems similar, not really much of a solution provided though.
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