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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.
https://atproto.com/guides/overview is a good start, but bit overwhelming when you get started.
https://github.com/bluesky-social/atproto-ecosystem provides a good overview of the current ecosystem. If you wanna see how something is done, best to find another project already doing it and get inspired from them.
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.