{
  "schema": "pg36-ch20-drill-run-v1",
  "release": "1.0-sandbox",
  "status": "formal-reference-accepted-with-exceptions",
  "target": "pg36-l2-vagrant/pg-test",
  "action": "planned-switchover-and-planned-baseline-restore",
  "run_id": "475e9b47-bc35-4687-87da-012f1d5ea455",
  "wrapper_started_at": "2026-07-29T19:39:33Z",
  "wrapper_finished_at": "2026-07-29T19:40:17Z",
  "wrapper_elapsed_seconds": 44,
  "forward_started_at": "2026-07-29T19:39:46Z",
  "forward_stable_at": "2026-07-29T19:39:52Z",
  "restore_started_at": "2026-07-29T19:40:04Z",
  "restore_stable_at": "2026-07-29T19:40:10Z",
  "versions": {
    "pigsty": "v4.4.0",
    "postgresql": "18.4",
    "patroni": "4.1.3"
  },
  "topology": {
    "before_leader": "pg-test-1",
    "forward_leader": "pg-test-2",
    "final_leader": "pg-test-1",
    "before_timeline": 5,
    "forward_timeline": 6,
    "restored_timeline": 7,
    "system_identifier_relation": "one unchanged identifier",
    "pg_test_3_checkpoint_timeline_after_restore": 3,
    "checkpoint_interpretation": "checkpoint metadata may lag current replay timeline"
  },
  "measurement": {
    "forward_command_ms": 2734.74125,
    "forward_action_to_stable_ms": 5822.6775,
    "restore_command_ms": 2851.349083,
    "restore_action_to_stable_ms": 6018.921166,
    "conservative_write_gap_ms": 6007.079917,
    "maximum_adjacent_ack_gap_ms": 5207.690167,
    "probe_interval_seconds": 0.206990042,
    "probe_attempts": 120,
    "acknowledged": 95,
    "unknown": 25,
    "acknowledged_rows_missing": 0,
    "unknown_committed": 0,
    "unknown_absent": 25,
    "unreconciled_unknown_outcomes": 0,
    "duplicate_tokens": 0
  },
  "gates": {
    "chapter_19_preflight": "accepted-with-exceptions",
    "chapter_19_postflight": "accepted-with-exceptions",
    "chapter_20_positive_validation": "ok",
    "chapter_20_negative_cases_rejected": 10,
    "temporary_service_cleanup": "ok"
  },
  "production_approval": false,
  "unplanned_failure_injected": false,
  "secret_values_exported": 0,
  "decision": {
    "sandbox_planned_switchover": "accepted-with-exceptions",
    "unplanned_failure_drill": "not-run",
    "production_ch20_gate": "pending"
  },
  "interpretation": "One healthy planned switchover and baseline restore met this sandbox contract. This is not automatic-failover, zero-RPO, fencing, or production-RTO evidence."
}