{
  "source": "1a53701d32aa1c560c0bebd5de60670532c1aeda",
  "simulation": "Historical schema + representative synthetic rows; not a cloud clone",
  "checks": [
    {
      "scenario": "valid_existing_data",
      "baseline_migrations": 38,
      "planned_migrations": 21,
      "fingerprinted_tables": 22,
      "final_migrations": 59,
      "old_rows_preserved": true,
      "new_schema": {
        "shared_logs_default_false": true,
        "campaigns_default_approved": true,
        "new_tables_present": true,
        "partial_ranking_index_present": true,
        "mission_unique_constraint_validated": true
      }
    },
    {
      "scenario": "duplicate_mission",
      "baseline_migrations": 38,
      "planned_migrations": 21,
      "fingerprinted_tables": 22,
      "controlled_failure": "mission_campaign_action_unique",
      "failed_constraint_not_recorded": true,
      "old_rows_unchanged_after_failure": true,
      "final_migrations": 59,
      "old_rows_preserved": true,
      "new_schema": {
        "shared_logs_default_false": true,
        "campaigns_default_approved": true,
        "new_tables_present": true,
        "partial_ranking_index_present": true,
        "mission_unique_constraint_validated": true
      }
    }
  ],
  "databases_deleted": true
}