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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.
It is on f-droid but you need to add a repository: https://gitlab.com/rfc2822/fdroid-firefox#firefox-f-droid-repo-unofficial . alternatively install the apk from signal: https://signal.org/android/apk/ as it self-updates
NOTE:
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Hence, a higher number means a more popular project.