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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 use (and occasionally contribute to) an event loop library Calloop. It's not quite the kind of event system you're working on, but you might still learn something from the architecture and API they use. Event "sources" are the primal thing, and are built up from composition. At the lowest level are extremely simple file-descriptor based event sources. The library itself wraps these to produce channels, "pings", timers, even async executors. User code wraps those to produce eg. IPC event sources, time-limited actions, subprocess management, etc. etc.