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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.
If you want something easy to write but also fast, check out https://github.com/graphql-crystal/graphql (I'm the author)
I'd suggest looking into Go instead of Rust if you're looking to build a fast HTTP based API. On top of my head, the best framework I can think of is gqlgen: https://github.com/99designs/gqlgen
NOTE:
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Hence, a higher number means a more popular project.