$ uv run tools/flow.py test cases/lab03-challenge2.json -v
✔ before: POST http://localhost:8800/usage-clear · HTTP 200 · 0.0s · {"cleared": 8}
    → request  POST http://localhost:8800/usage-clear
      {}
    ← response HTTP 200
      {
        "cleared": 8
      }
✔ before: POST http://localhost:8800/budget/reset · HTTP 200 · 0.0s · {"daily_usd": 1.0, "user_limit_per_min": 20, "max_question_chars": 500, "used_usd": 0, "remaining_usd": 1.0, "over": fal
    → request  POST http://localhost:8800/budget/reset
      {}
    ← response HTTP 200
      {
        "daily_usd": 1.0,
        "user_limit_per_min": 20,
        "max_question_chars": 500,
        "used_usd": 0,
        "remaining_usd": 1.0,
        "over": false
      }
✔ before: POST http://localhost:8800/usage · HTTP 200 · 0.0s · {"stored": 4, "total": 4}
    → request  POST http://localhost:8800/usage
      {
        "items": [
          {
            "request_id": "r1",
            "user": "이준호",
            "step": "answer",
            "model": "gpt-4.1-mini",
            "prompt_tokens": 1000,
            "completion_tokens": 100,
            "cost_usd": 0.00056,
            "route": "자동 답변"
          },
          {
            "request_id": "r1",
            "user": "이준호",
            "step": "classify",
            "model": "gpt-5.4-nano",
            "prompt_tokens": 100,
            "completion_tokens": 20,
            "cost_usd": 4.5e-05,
            "route": "자동 답변"
          },
          {
            "request_id": "r2",
            "user": "박서연",
            "step": "answer",
            "model": "gpt-4.1-mini",
            "prompt_tokens": 2000,
            "completion_tokens": 200,
            "cost_usd": 0.00112,
            "route": "자동 답변"
          },
          {
            "request_id": "r3",
            "user": "이준호",
            "step": "answer",
            "model": "gpt-4.1-mini",
            "prompt_tokens": 500,
            "completion_tokens": 40,
            "cost_usd": 0.000264,
            "route": "자동 답변"
          }
        ]
      }
    ← response HTTP 200
      {
        "stored": 4,
        "total": 4
      }
POST http://localhost:5678/webhook/my-cost-report · 5 case(s) × 1
✘ 모두 nano였다면 · 0.0s · $0.001989 · what_if.model = null (expected gpt-5.4-nano); what_if.cost_usd = null (expected 0.00117); what_if.saving_usd = null (expected 0.000819); what_if.projected_month_usd = null (expected 0.858)
    → request  POST /webhook/my-cost-report
      {
        "requests_per_day": 100,
        "workdays": 22,
        "what_if_model": "gpt-5.4-nano"
      }
    ← response HTTP 200
      {
        "requests": 3,
        "calls": 4,
        "cost_usd": 0.001989,
        "avg_usd": 0.000663,
        "by_model": {
          "gpt-4.1-mini": 0.001944,
          "gpt-5.4-nano": 4.5e-05
        },
        "top_user": "박서연",
        "projected_month_usd": 1.4586,
        "daily_budget_usd": 1,
        "remaining_usd": 0.998011,
        "over_budget": false
      }
✔ 원래 숫자는 그대로 · 0.1s · $0.001989
    → request  POST /webhook/my-cost-report
      {
        "requests_per_day": 100,
        "workdays": 22,
        "what_if_model": "gpt-5.4-nano"
      }
    ← response HTTP 200
      {
        "requests": 3,
        "calls": 4,
        "cost_usd": 0.001989,
        "avg_usd": 0.000663,
        "by_model": {
          "gpt-4.1-mini": 0.001944,
          "gpt-5.4-nano": 4.5e-05
        },
        "top_user": "박서연",
        "projected_month_usd": 1.4586,
        "daily_budget_usd": 1,
        "remaining_usd": 0.998011,
        "over_budget": false
      }
✘ 모두 mini였다면 · 아끼는 돈이 음수 · 0.0s · $0.001989 · what_if.cost_usd = null (expected 0.002016); what_if.saving_usd = null (expected -2.7e-05)
    → request  POST /webhook/my-cost-report
      {
        "what_if_model": "gpt-4.1-mini"
      }
    ← response HTTP 200
      {
        "requests": 3,
        "calls": 4,
        "cost_usd": 0.001989,
        "avg_usd": 0.000663,
        "by_model": {
          "gpt-4.1-mini": 0.001944,
          "gpt-5.4-nano": 4.5e-05
        },
        "top_user": "박서연",
        "projected_month_usd": 0.043758,
        "daily_budget_usd": 1,
        "remaining_usd": 0.998011,
        "over_budget": false
      }
✘ 없는 모델은 400 · 0.0s · $0.001989 · status 200 (expected 400); error = null (expected unknown model); known has none of ['gpt-5.4-nano']
    → request  POST /webhook/my-cost-report
      {
        "what_if_model": "gpt-9"
      }
    ← response HTTP 200
      {
        "requests": 3,
        "calls": 4,
        "cost_usd": 0.001989,
        "avg_usd": 0.000663,
        "by_model": {
          "gpt-4.1-mini": 0.001944,
          "gpt-5.4-nano": 4.5e-05
        },
        "top_user": "박서연",
        "projected_month_usd": 0.043758,
        "daily_budget_usd": 1,
        "remaining_usd": 0.998011,
        "over_budget": false
      }
✔ what_if 없이 부르면 과제 1과 같음 · 0.0s · $0.001989
    → request  POST /webhook/my-cost-report
      {}
    ← response HTTP 200
      {
        "requests": 3,
        "calls": 4,
        "cost_usd": 0.001989,
        "avg_usd": 0.000663,
        "by_model": {
          "gpt-4.1-mini": 0.001944,
          "gpt-5.4-nano": 4.5e-05
        },
        "top_user": "박서연",
        "projected_month_usd": 0.043758,
        "daily_budget_usd": 1,
        "remaining_usd": 0.998011,
        "over_budget": false
      }
Passed 2/5
report: runs/lab03-challenge2-20261028-211219.json
✔ after: POST http://localhost:8800/budget/reset · HTTP 200 · 0.0s · {"daily_usd": 1.0, "user_limit_per_min": 20, "max_question_chars": 500, "used_usd": 0.001989, "remaining_usd": 0.998011,
    → request  POST http://localhost:8800/budget/reset
      {}
    ← response HTTP 200
      {
        "daily_usd": 1.0,
        "user_limit_per_min": 20,
        "max_question_chars": 500,
        "used_usd": 0.001989,
        "remaining_usd": 0.998011,
        "over": false
      }
✔ after: POST http://localhost:8800/usage-clear · HTTP 200 · 0.0s · {"cleared": 4}
    → request  POST http://localhost:8800/usage-clear
      {}
    ← response HTTP 200
      {
        "cleared": 4
      }