Which edge cases come up around “Staging discipline”, thinking about rollout tooling not built?

Release rules from the security model: snapshots first, data never moves with code, a backup before any data-touching change, test on a copy, one stage per release, the previous build kept for real rollback, and ledger and customer data last. Parts exist as code (test on a copy, verified backup before removal); the rollout tooling does not. Plan for: rollout tooling not built; installer that leaves the data folder alone not proven; sensitive modules last. It is designed in a document and no code exists.

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