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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.
First, it is utterly impractical to use an off-the-shelf authentication system like Devise in an introductory tutorial—there is simply too much information at once. The User model alone would be enough to swamp any beginner, much less all the other moving parts. Indeed, as noted in the aside box that specifically addresses this issue, the official Devise documentation itself recommends that you start with the Ruby on Rails Tutorial (emphasis added):
You are of course under no obligation to do so, but if you have concrete examples of how you would improve the tests in the text I would greatly appreciate hearing from you. Especially useful would be forking the reference app and refactoring the tests inline.