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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.
There are some existing messaging solutions, but these need some extra steps or layers, not just logging into your Metamask and getting notified someone has messaged your ETH address. https://ethmail.cc/ https://status.im/
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