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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.
Maybe this is what you're looking for? embedded-sdmmc-rs
Tock recently added a KV store that may do what you want. Not a FS, but think you could it to build one. Based on Yaffs1 according to docs.
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