https://sudonull.com/rsync-hardlink-for-rollback-on-ext4-linux
Set up fast system rollback on ext4 without Btrfs/ZFS: rsync + hardlink. Snapshot structure, restore commands, limitations. Instructions for sysadmin.
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https://sudonull.com/three-data-aggregation-errors-in-bi-systems
Learn why BI systems lie: mathematical errors in averaging, count distinct, and snapshot metrics. How to build analytics without distortions.
https://sudonull.com/aria-snapshots-playwright-for-ai-agents
Learn how Playwright generates semantic YAML ARIA snapshots for web agents. Token optimization, incremental deltas, DOM processing. For middle/senior dev.
https://sudonull.com/react-testing-library-ditching-snapshots
Transition from Enzyme to RTL: testing React component behavior, not markup. Checklists, examples, migration. Learn how to write robust tests.
https://sudonull.com/truenas-file-server-with-zfs-and-vpn
Setting up TrueNAS on ZFS for reliable storage with remote access via Tailscale/ZeroTier. Snapshots, replication, monitoring. Instructions for developers.
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