{
  "occurrences": [
    {
      "npc_id": "npc:test-mira",
      "name": "Mira Thorn",
      "kind": "dialogue",
      "source_refs": [
        {"source_id": "session-alpha", "start_unit_id": 1, "end_unit_id": 2}
      ]
    },
    {
      "npc_id": "npc:test-guard",
      "name": "Hooded Guard",
      "kind": "combat_opponent",
      "source_refs": [
        {"source_id": "session-alpha", "start_unit_id": 3, "end_unit_id": 3}
      ]
    }
  ]
}