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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.
Depending on how complex the frontend is, consider having the frontend in Rails as well with Hotwire. You can use the official Android and iOS repos for mobile or go for something like https://expo.dev/
NOTE:
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Hence, a higher number means a more popular project.