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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.
For something more advanced you can look at this example but this is very advanced, its from an IoT platform written in Golang - https://github.com/mainflux/mainflux
As an inbetween beginner and advanced you can look at this project - https://microservices-demo.github.io/ its more practical and again uses Python.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.