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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.
For the specific problem your mention with Vec, slab is quite nice.
I think the slotmap crate is similar to what you're trying to write: https://github.com/orlp/slotmap
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