$ uv run tools/flow.py ops --reset
✔ created tickets, DLQ and alerts emptied, fault switch all ok

$ uv run tools/flow.py fault tickets error
✔ fault switch: {"faq": "ok", "tickets": "error", "prompts": "ok", "usage": "ok", "dlq": "ok", "slow_seconds": 8}

$ uv run tools/flow.py call my-intake requests/batch-two.json
HTTP 200 · 2.8s
{
  "total": 2,
  "created": 0,
  "failed": 2,
  "rejected": 0,
  "duplicates": 0,
  "unclassified": 0,
  "results": [
    {
      "id": "R-301",
      "status": "failed",
      "reason": "500 - \"{\\\"error\\\": \\\"tickets service is failing (fault switch)\\\"}\""
    },
    {
      "id": "R-302",
      "status": "failed",
      "reason": "500 - \"{\\\"error\\\": \\\"tickets service is failing (fault switch)\\\"}\""
    }
  ]
}

$ uv run tools/flow.py fault tickets ok
✔ fault switch: {"faq": "ok", "tickets": "ok", "prompts": "ok", "usage": "ok", "dlq": "ok", "slow_seconds": 8}

$ uv run tools/flow.py ops
fault switch: all ok
created tickets: 0
DLQ: 0 (parked 0)
alerts: 0

$ uv run tools/flow.py call nightly-report
HTTP 500 · 0.1s
{
  "message": "Error in workflow"
}

$ uv run tools/flow.py test cases/lab02.json -v
✔ before: POST http://localhost:8800/tickets-reset · HTTP 200 · 0.0s · {"cleared": 0}
    → request  POST http://localhost:8800/tickets-reset
      {}
    ← response HTTP 200
      {
        "cleared": 0
      }
✔ before: POST http://localhost:8800/dlq-clear · HTTP 200 · 0.0s · {"cleared": 0}
    → request  POST http://localhost:8800/dlq-clear
      {}
    ← response HTTP 200
      {
        "cleared": 0
      }
✔ before: POST http://localhost:8800/alerts-clear · HTTP 200 · 0.0s · {"cleared": 0}
    → request  POST http://localhost:8800/alerts-clear
      {}
    ← response HTTP 200
      {
        "cleared": 0
      }
✔ before: POST http://localhost:8800/admin/fault · HTTP 200 · 0.0s · {"faq": "ok", "tickets": "ok", "prompts": "ok", "usage": "ok", "dlq": "ok", "slow_seconds": 8}
    → request  POST http://localhost:8800/admin/fault
      {
        "faq": "ok",
        "tickets": "ok",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok"
      }
    ← response HTTP 200
      {
        "faq": "ok",
        "tickets": "ok",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok",
        "slow_seconds": 8
      }
POST http://localhost:5678/webhook/my-intake · 4 case(s) × 1
✔ before: POST http://localhost:8800/admin/fault · HTTP 200 · 0.0s · {"faq": "ok", "tickets": "error", "prompts": "ok", "usage": "ok", "dlq": "ok", "slow_seconds": 8}
    → request  POST http://localhost:8800/admin/fault
      {
        "tickets": "error"
      }
    ← response HTTP 200
      {
        "faq": "ok",
        "tickets": "error",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok",
        "slow_seconds": 8
      }
✔ 예제 1 · API가 멈추면 실패로 표시 · 200 · 2.8s
    → request  POST /webhook/my-intake
      {
        "requests": [
          {
            "id": "R-301",
            "user": "정우성",
            "text": "사내 위키 로그인이 안 돼요"
          },
          {
            "id": "R-302",
            "user": "이준호",
            "text": "노트북 배터리가 금방 닳아요"
          }
        ]
      }
    ← response HTTP 200
      {
        "total": 2,
        "created": 0,
        "failed": 2,
        "rejected": 0,
        "duplicates": 0,
        "unclassified": 0,
        "results": [
          {
            "id": "R-301",
            "status": "failed",
            "reason": "500 - \"{\\\"error\\\": \\\"tickets service is failing (fault switch)\\\"}\""
          },
          {
            "id": "R-302",
            "status": "failed",
            "reason": "500 - \"{\\\"error\\\": \\\"tickets service is failing (fault switch)\\\"}\""
          }
        ]
      }
✔ after: POST http://localhost:8800/admin/fault · HTTP 200 · 0.0s · {"faq": "ok", "tickets": "ok", "prompts": "ok", "usage": "ok", "dlq": "ok", "slow_seconds": 8}
    → request  POST http://localhost:8800/admin/fault
      {
        "faq": "ok",
        "tickets": "ok",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok"
      }
    ← response HTTP 200
      {
        "faq": "ok",
        "tickets": "ok",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok",
        "slow_seconds": 8
      }
✘ 예제 1 · 실패한 2건은 DLQ에 · 0.0s · size = 0 (expected 2); items has none of ['R-301', 'R-302']
    → request  POST http://localhost:8800/dlq/list
      {}
    ← response HTTP 200
      {
        "size": 0,
        "parked": 0,
        "items": []
      }
✔ 예제 2 · 예상 못 한 오류 (nightly-report) · 0.0s
    → request  POST /webhook/nightly-report
      {}
    ← response HTTP 500
      {
        "message": "Error in workflow"
      }
… before: wait 3s
✘ 예제 2 · Error Workflow가 알림을 남김 · 0.0s · severity = null (expected critical); reason = null (expected unexpected); workflow = null (expected 76 Nightly report (provided, has a bug)); node has none of ['Count by category']
    → request  POST http://localhost:8800/alerts/latest
      {}
    ← response HTTP 200
      {}
Passed 2/4
report: runs/lab02-20261029-141433.json
✔ after: POST http://localhost:8800/admin/fault · HTTP 200 · 0.0s · {"faq": "ok", "tickets": "ok", "prompts": "ok", "usage": "ok", "dlq": "ok", "slow_seconds": 8}
    → request  POST http://localhost:8800/admin/fault
      {
        "faq": "ok",
        "tickets": "ok",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok"
      }
    ← response HTTP 200
      {
        "faq": "ok",
        "tickets": "ok",
        "prompts": "ok",
        "usage": "ok",
        "dlq": "ok",
        "slow_seconds": 8
      }