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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.
(And just to tempt you further, here is a link for the tool I would have used to downgrade my 5s: https://github.com/MatthewPierson/Vieux) (hopefully you have a Mac, but there are other tools I think if you don't.)
NOTE:
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