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instance_identity is one row made by migration 0127 with a random id, so an instance has it before its first account. A full backup carries it in its header as instance_id (the tar manifest header and the JSON top level); BACKUP_VERSION is 28. The table rides in _NOT_INCLUDED: a restore decides from the header value rather than copying a row. Two stores with the same id number their rows the same way. That is what lets a later step roll a live instance back by original id, refuse a backup whose ids would land on unrelated rows, and have a fresh-instance restore adopt the backup's id (adopt_instance_id). Milestone 582, step 1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>