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Restore an isolated representative snapshot with outbound integrations disabled. Rehearse the complete reviewed upgrade, including any required name remediation and V42 preparation, then matching application startup and money/access checks. Exercise restoration of the prior compatible database/artifacts/configuration. Include relevant worlds/plugin stores in the recovery scope, not only SQL.
Done when upgrade and restore receipts record source/runtime versions, durations, space requirements, trigger/object inventory and invariants, and establish the maintenance/rollback budget. No production mutation is part of this rehearsal.