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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.
Zero 2 Prod is absolutely brilliant. It's £35 but worth ten times that. https://www.zero2prod.com/
Serde (The nicest way to read and write TOML, JSON, YAML, etc.) and crates that integrate with it like csv and quick-xml
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