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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 myself made a bot simmillar to what you want although it's not exactly what you want with a little bit of tweaking you could get a simple bot which sends an announcement which people can react to without all the additional stuff the other bots provide and it's up to you to decide what's the best for you: https://github.com/CrumblyLiquid/Organizer
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.