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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.
API on Rails 6 Rails API with TDD with minitest. Builds authenticated system with 5 models - costs $10.00, but you can give more if you feel generous. There's a github repo if you have issues.
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