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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.
You could also take a look at my Flask Starter App repo, it has SQL DB auth and also API routes implemented, you could simply clone it and tinker with it to suit your needs.
NOTE:
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Hence, a higher number means a more popular project.