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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.
Afaik Nautilus is capable of that. The messages are of course not on chain, because the Nano network doesn't support messages, but within the app should be enough for most cases. In fact I find it way better to have end-to-end encrypted memos within an app than publicly readable messages on blockchain.
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