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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.
Here's some code I wrote without design for testability: https://github.com/heroku/hatchet/blob/main/lib/hatchet/app.rb. It's a monster. To test it in isolation you MUST use mocks/stubs or can only be called in an integration test (slow). If I wrote this with testing in mind, you probably wouldn't have to see code like this in my tests: https://github.com/heroku/hatchet/blob/7aa774b1ae713724a84f25d37a545963f9445b37/spec/hatchet/app_spec.rb#L42-L47.
Versus I wrote most of the code here with testing in mind https://github.com/heroku/cutlass/tree/main/spec/unit.