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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.
Actually I put together vundo diff functionality which I use everyday; it's very simple so you can easily stick in your .emacs. Or perhaps will get added to vundo (maybe with a special color for the "diff-from" circle, or the ability to set a "from" and "to" for diffing across a few undos) . It's "on demand" rather than automatic, but I actually find it easier to get a diff buffer where I want it, then leave it as I move around the tree. Very happy with vundo.
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