{
  "synthetic": true,
  "not_a_live_export": true,
  "source_a_snapshot": "2026-10-01T10:00:00Z",
  "source_b_snapshot": "2026-10-02T10:00:00Z",
  "input_rows": 8,
  "identified_rows": 7,
  "distinct_known_ids": [
    "DEMO-101",
    "DEMO-102",
    "DEMO-103",
    "DEMO-104",
    "DEMO-105"
  ],
  "overlapping_ids": [
    "DEMO-103",
    "DEMO-104"
  ],
  "unresolved_rows": [
    {
      "file": "source-b.csv",
      "data_row": 4,
      "reason": "missing tg_id; matching names are insufficient"
    }
  ],
  "unique_people_total": null,
  "changed_username_observation": {
    "tg_id": "DEMO-103",
    "a": "TRAIN-GAMMA",
    "b": "TRAIN-NEW"
  },
  "same_username_different_ids": {
    "username": "TRAIN-DELTA",
    "a": "DEMO-104",
    "b": "DEMO-105"
  },
  "acceptance_decision": "Five known identifiers can be reconciled; one unidentified row remains unresolved. Do not claim six distinct people or full coverage."
}