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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.
Probably not exactly what you want, but Etesync is a good service to know about. They have a note function that keeps encrypted notes in the cloud. It definitely won't have the functionality of Joplin, but it works very well for small notes.
You can try my project https://github.com/Ogefest/Notepack
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