[
  {
    "attempt_no": "AT-001",
    "lead_no": "LD-001",
    "region_raw": "US-East",
    "attempted_at": "2026-08-18T09:10",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-002",
    "lead_no": "LD-002",
    "region_raw": "us-east",
    "attempted_at": "2026-08-19T14:00",
    "outcome": "voicemail",
    "duration_sec": 18
  },
  {
    "attempt_no": "AT-003",
    "lead_no": "LD-003",
    "region_raw": "US-West",
    "attempted_at": "2026-08-19T16:30",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-004",
    "lead_no": "LD-004",
    "region_raw": "US-East",
    "attempted_at": "2026-08-19T10:00",
    "outcome": "connected",
    "duration_sec": 212
  },
  {
    "attempt_no": "AT-005",
    "lead_no": "LD-005",
    "region_raw": "US-Central",
    "attempted_at": "2026-08-19T11:00",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-006",
    "lead_no": "LD-005",
    "region_raw": "US-Central",
    "attempted_at": "2026-08-19T15:00",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-007",
    "lead_no": "LD-005",
    "region_raw": "US-Central",
    "attempted_at": "2026-08-19T18:00",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-008",
    "lead_no": "LD-006",
    "region_raw": "CA-Ontario",
    "attempted_at": "2026-08-19T13:00",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-009",
    "lead_no": "LD-007",
    "region_raw": "US-West",
    "attempted_at": null,
    "outcome": "failed",
    "duration_sec": null
  },
  {
    "attempt_no": "AT-010",
    "lead_no": "LD-008",
    "region_raw": "US-East",
    "attempted_at": "2026-08-17T09:00",
    "outcome": "voicemail",
    "duration_sec": 22
  },
  {
    "attempt_no": "AT-011",
    "lead_no": "LD-009",
    "region_raw": "us east",
    "attempted_at": "2026-08-18T15:00",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-012",
    "lead_no": "LD-010",
    "region_raw": "US-West",
    "attempted_at": "2026-08-19T19:30",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-013",
    "lead_no": "LD-011",
    "region_raw": "US-Central",
    "attempted_at": "2026-08-16T10:00",
    "outcome": "voicemail",
    "duration_sec": 15
  },
  {
    "attempt_no": "AT-014",
    "lead_no": "LD-012",
    "region_raw": "US-East",
    "attempted_at": "2026-08-19T20:30",
    "outcome": "no_answer",
    "duration_sec": 0
  },
  {
    "attempt_no": "AT-015",
    "lead_no": "LD-013",
    "region_raw": "US-West",
    "attempted_at": "2026-08-15T11:00",
    "outcome": "connected",
    "duration_sec": 340
  },
  {
    "attempt_no": "AT-005",
    "lead_no": "LD-005",
    "region_raw": "US-Central",
    "attempted_at": "2026-08-19T11:00",
    "outcome": "no_answer",
    "duration_sec": 0
  }
]