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tag
A command line tool to manipulate tags on Mac OS X files, and to query for files with those tags.
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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.
Not sure how much low-level filesystem access you'd need, but it would be cool to support adding metadata via tags, a la
https://github.com/jdberry/tag/
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