[
  {
    "txn_id": "t_01",
    "wallet_id": "w_02",
    "type": "credit",
    "amount": 100,
    "source_raw": "방문 인증",
    "source_id": "visit",
    "idempotency_key": "k1",
    "created_at": "2026-05-10T09:00:00"
  },
  {
    "txn_id": "t_02",
    "wallet_id": "w_02",
    "type": "credit",
    "amount": 100,
    "source_raw": "방문 인증",
    "source_id": "visit",
    "idempotency_key": "k1",
    "created_at": "2026-05-10T09:00:03"
  },
  {
    "txn_id": "t_03",
    "wallet_id": "w_02",
    "type": "debit",
    "amount": 1500,
    "source_raw": "굿즈 구매",
    "source_id": "goods",
    "idempotency_key": "k2",
    "created_at": "2026-05-10T10:00:00"
  },
  {
    "txn_id": "t_04",
    "wallet_id": "w_05",
    "type": "debit",
    "amount": 300,
    "source_raw": "사전예약 차감",
    "source_id": "reserve",
    "idempotency_key": "k3",
    "created_at": "2026-05-10T11:00:00"
  },
  {
    "txn_id": "t_05",
    "wallet_id": "w_99",
    "type": "credit",
    "amount": 50,
    "source_raw": "후기 작성",
    "source_id": "review",
    "idempotency_key": "k4",
    "created_at": "2026-05-10T12:00:00"
  },
  {
    "txn_id": "t_06",
    "wallet_id": "w_04",
    "type": "debit",
    "amount": 100,
    "source_raw": "굿즈 구매",
    "source_id": "goods",
    "idempotency_key": "k5",
    "created_at": "2026-05-10T13:00:00"
  },
  {
    "txn_id": "t_07",
    "wallet_id": "w_03",
    "type": "debit",
    "amount": 70,
    "source_raw": "굿즈 교환",
    "source_id": "goods",
    "idempotency_key": "k6",
    "created_at": "2026-05-10T14:00:00"
  },
  {
    "txn_id": "t_08",
    "wallet_id": "w_08",
    "type": "credit",
    "amount": 0,
    "source_raw": "이벤트 보너스",
    "source_id": null,
    "idempotency_key": "k7",
    "created_at": "2026-05-10T15:00:00"
  },
  {
    "txn_id": "t_09",
    "wallet_id": "w_10",
    "type": "credit",
    "amount": 200,
    "source_raw": "리뷰",
    "source_id": "review",
    "idempotency_key": "k8",
    "created_at": "2026-05-10T16:00:00"
  },
  {
    "txn_id": "t_10",
    "wallet_id": "w_10",
    "type": "debit",
    "amount": 200,
    "source_raw": "코인 전환",
    "source_id": null,
    "idempotency_key": "k9",
    "created_at": "2026-05-10T16:05:00"
  },
  {
    "txn_id": "t_11",
    "wallet_id": "w_01",
    "type": "debit",
    "amount": 10,
    "source_raw": "굿즈 구매",
    "source_id": "goods",
    "idempotency_key": "k10",
    "created_at": "2026-05-10T17:00:00"
  },
  {
    "txn_id": "t_12",
    "wallet_id": "w_06",
    "type": "credit",
    "amount": 30,
    "source_raw": "재방문",
    "source_id": "visit",
    "idempotency_key": "k11",
    "created_at": "2026-05-10T18:00:00"
  }
]