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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.
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sysbox
An open-source, next-generation "runc" that empowers rootless containers to run workloads such as Systemd, Docker, Kubernetes, just like VMs.
These guys build something more low-level (based on LXC) which is used in 1000s of Discord channels. Seems to do exactly what I want in a secure way, on cheap VPSes: https://github.com/engineer-man/piston
Maybe this can get you most of the way: https://github.com/python-discord/snekbox
not sure timeout is the best approach but it has worked so far: https://github.com/mrrusof/the-witness-stand
Maybe sysbox can do what you want.