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          "id": "GEO-LUX-LH-000141-historical_site-hydro",
          "kind": "geolocation_claim",
          "title": "Zmiinyi Lighthouse — State Hydrographic Service of Ukraine",
          "url": "https://hydro.gov.ua/?page_id=381"
        },
        {
          "id": "HERITAGE-REL-000181",
          "kind": "heritage_relation",
          "title": "Zmiinyi lighthouse-site continuity",
          "url": ""
        },
        {
          "id": "HERITAGE-REL-000183",
          "kind": "heritage_relation",
          "title": "Zmiinyi 1843 lighthouse fabric",
          "url": ""
        },
        {
          "id": "HERITAGE-REL-000184",
          "kind": "heritage_relation",
          "title": "Zmiinyi 1843 lighthouse fabric",
          "url": ""
        },
        {
          "id": "HERITAGE-REL-000185",
          "kind": "heritage_relation",
          "title": "Zmiinyi pre-2022 restored lighthouse fabric",
          "url": ""
        },
        {
          "id": "HERITAGE-REL-000186",
          "kind": "heritage_relation",
          "title": "Zmiinyi pre-2022 restored lighthouse fabric",
          "url": ""
        },
        {
          "id": "HERITAGE-REL-000187",
          "kind": "heritage_relation",
          "title": "Zmiinyi pre-2022 restored lighthouse fabric",
          "url": ""
        },
        {
          "id": "HERITAGE-REL-000189",
          "kind": "heritage_relation",
          "title": "2026 Zmiinyi Island special cancellation",
          "url": ""
        }
      ],
      "state_id": "LUX-LH-000141-state-005",
      "structure": {
        "asset_id": "LUX-ASSET-000662",
        "asset_kind": "structure",
        "label": "Zmiinyi 1843 lighthouse fabric",
        "relation_id": "HERITAGE-REL-000183",
        "relation_type": "part_of",
        "review_status": "reviewed",
        "url": "/heritage-assets/LUX-ASSET-000662/",
        "valid_from": "1843",
        "valid_to": ""
      },
      "unknown_fields": [
        "tower_height",
        "material",
        "light_characteristic",
        "focal_height",
        "light_visibility"
      ],
      "valid_from": "2026",
      "valid_to": ""
    }
  ],
  "title": "Змеиный (Фидониси)",
  "year_max": 2026,
  "year_min": 1843
}