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Run 4960 was the control — the chain compared against itself, which must come back clean before a clean diff after the squash means anything. It did its job and failed on both counts. 1. The harness is sound. Both dumps came back 1123 normalised lines and differed on EXACTLY two, the \restrict / \unrestrict pair that newer pg_dump emits to fence a dump against injection during restore. It is a fresh random nonce per invocation, so it differs by construction and is noise by definition. Now filtered — and the control is what licenses that filter: it was OBSERVED to be the only false positive rather than assumed to be one, which matters for a check whose whole value is that its normalisation does not hide a real difference. 2. The candidate-baseline step never ran. `if: github.event.inputs .generate == 'true'` on a `type: boolean` input silently evaluated false — no diagnostic, step skipped, job carried on. The same `github.event.inputs` typing quirk build.yml already works around for force_build. Rather than fight the input typing, the gate is now the tree itself: skip if alembic/versions holds one file. That is the real question anyway — there is nothing to generate once the chain is collapsed — and it cannot be silently wrong the way an unevaluated expression can. Worth noting what the control also proved incidentally: the two schemas were byte-identical across 1123 lines despite being built by separate alembic runs into separate databases, so pg_dump's object ordering is stable enough to diff directly and no sort normalisation is needed.