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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.
I'm currently using org-alert, and it only works when emacs is up and running. If you need the notifications to happen even when you don't have an instance of an emacs window open, maybe you could use Emacs as a Daemon and then enable it with your favourite daemon manager; though I have not tested this and there may be pitfalls.
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