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My experimental hex editor toolkit is now available from: github.com/petergeoghegan. Extreme caution is advised!

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I taught my hex editor to parse the Postgres block format. This image is of a page from a B-Tree index on a text column -- "cities(city)".

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How extreme, on a scale from “might put a core file in ~” to “systemd bricking hardware by mounting efivarfs read-wtite”?

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The hex editor is prone to crashing. And, it just isn't a great idea to use a hex editor on a running data directory with real data.