{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-del-valle-fishing-stocking",
        "evidence_ids": [
          "evidence-del-valle-fishing-stocking"
        ],
        "predicate": "fish_stocking",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": {
          "channel_catfish": "summer",
          "rainbow_trout": "fall_through_spring"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-fishing-stocking",
          "evidence_id": "evidence-del-valle-fishing-stocking",
          "notes": "",
          "observation_id": "observation-ebrpd-fishing-stocking",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The District lists Del Valle among waters stocked with rainbow trout from fall through spring and channel catfish in summer, and manages other gamefish including bass, bluegill, sunfish, and crappie.",
          "observation_id": "observation-ebrpd-fishing-stocking",
          "observed_at": null,
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-fishing"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/fishing",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-fishing"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "lake-del-valle",
      "kind": "lake",
      "name": "Lake Del Valle"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-map-picnic-fishing",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-ebrpd-fishing-stocking.json",
      "reason": "Add the April 2026 Del Valle map plus official picnic and fishing evidence, preserving applicability gaps.",
      "record_id": "observation-ebrpd-fishing-stocking",
      "record_type": "observation",
      "summary": "Ingest the April 2026 park map, picnic inventory, and fishing requirements with explicit conflicts and spatial gaps."
    }
  ],
  "navigation": {
    "next_id": "observation-ebrpd-five-canyons-visitor-profile",
    "position": 90,
    "previous_id": "observation-ebrpd-fishing-licenses",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "The District lists Del Valle among waters stocked with rainbow trout from fall through spring and channel catfish in summer, and manages other gamefish including bass, bluegill, sunfish, and crappie.",
      "observation_id": "observation-ebrpd-fishing-stocking",
      "observed_at": null,
      "observer": "Wayproof source review",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-fishing"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "The District lists Del Valle among waters stocked with rainbow trout from fall through spring and channel catfish in summer, and manages other gamefish including bass, bluegill, sunfish, and crappie.",
    "observation_id": "observation-ebrpd-fishing-stocking",
    "observed_at": null,
    "observer": "Wayproof source review",
    "retrieved_at": "2026-09-20T00:00:00+00:00",
    "source_id": "source-ebrpd-fishing"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/recreation/fishing",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-fishing"
    }
  ]
}