[Deploy] Add backup freshness preflight for destructive migrations (#3781)#3937
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josemiguel3125-sketch wants to merge 1 commit into
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[Deploy] Add backup freshness preflight for destructive migrations (#3781)#3937josemiguel3125-sketch wants to merge 1 commit into
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Description
Fixes #3781
Adds a preflight gate that blocks destructive migrations unless a recent verified backup exists.
Changes
src/migration/metadata.py—MigrationMetadatawithMigrationClass.DESTRUCTIVE/NON_DESTRUCTIVEsrc/migration/backup.py—BackupVerifierchecks backup existence, age, and restore validitysrc/migration/preflight.py—PreflightGateiterates migrations and gates destructive onesdeploycommand accepts--backupand--migration-metadataflagsAcceptance Criteria