Add extra deployment phase for destructive migrations#5509

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deployment-stability-cs-12113

Commits on Jul 15, 2026

Gate destructive DB migrations behind a post-deploy removal phase

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Commits on Jul 16, 2026

Commits on Jul 17, 2026

Keep `pnpm migrate create` additive-only in the two-phase driver

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Make two-phase `down` revert the requested count across both phases

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Guard against destructive DDL in additive migrations + document the split

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Drop dated incident references from migration docs/comments

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DEMO: misplaced destructive migration to show the CI guard failing

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Pass changed migrations to the guard via env, not inline args

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Revert "DEMO: misplaced destructive migration to show the CI guard failing"
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