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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.
I hesitate to append this but one option I have seen thrown around and also debated is git-crypt [1] There are many caveats to doing this as any integrations that would need to read the file contents would also need to be able to decrypt the files so this may not be entirely useful and may add many levels of complexity and fragility.
[1] - https://github.com/AGWA/git-crypt
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