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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.
This may not be what you are looking for, but why not use a combination of Postgres listen/notify and PushPin[0] to support push notifications?
[0] https://pushpin.org
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Hence, a higher number means a more popular project.
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