[
  {
    "name": "single fact",
    "category": "control",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "a"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "newer independent fact",
    "category": "update",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "b"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "before update",
    "category": "update",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "a"
    ],
    "at": "2026-01-01T12:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "correction effective boundary",
    "category": "correction",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "correct",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture",
        "target": "a",
        "valid_until": "2026-01-03T00:00:00Z"
      }
    ],
    "expected": [
      "b"
    ],
    "at": "2026-01-02T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "expired correction no resurrection",
    "category": "correction",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "correct",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture",
        "target": "a",
        "valid_until": "2026-01-03T00:00:00Z"
      }
    ],
    "expected": [],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "deleted correction no resurrection",
    "category": "deletion",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "correct",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture",
        "target": "a",
        "valid_until": "2026-01-03T00:00:00Z"
      },
      {
        "id": "d",
        "session": "one",
        "kind": "delete",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-03T00:00:00Z",
        "key": "",
        "value": "",
        "source": "",
        "target": "b"
      }
    ],
    "expected": [],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "deleted original",
    "category": "deletion",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "d",
        "session": "one",
        "kind": "delete",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "",
        "value": "",
        "source": "",
        "target": "a"
      }
    ],
    "expected": [],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "deletion applies to past queries",
    "category": "deletion",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "d",
        "session": "one",
        "kind": "delete",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "",
        "value": "",
        "source": "",
        "target": "a"
      }
    ],
    "expected": [],
    "at": "2026-01-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "expiration boundary",
    "category": "expiration",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture",
        "valid_until": "2026-02-01T00:00:00Z"
      }
    ],
    "expected": [],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "future assertion",
    "category": "validity",
    "events": [
      {
        "id": "b",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture"
      }
    ],
    "expected": [],
    "at": "2026-01-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "independent expiry fallback",
    "category": "expiration",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture",
        "valid_until": "2026-01-03T00:00:00Z"
      }
    ],
    "expected": [
      "a"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "other session invisible",
    "category": "isolation",
    "events": [
      {
        "id": "secret",
        "session": "two",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      }
    ],
    "expected": [],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "other session no ranking influence",
    "category": "isolation",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "secret",
        "session": "two",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "office office",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "a"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "absent vocabulary abstention",
    "category": "retrieval",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      }
    ],
    "expected": [],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "unrelated"
  },
  {
    "name": "timestamp tie",
    "category": "conflict",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "z",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "West",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "z"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "concurrent corrections",
    "category": "conflict",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "correct",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture",
        "target": "a"
      },
      {
        "id": "c",
        "session": "one",
        "kind": "correct",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-03T00:00:00Z",
        "key": "office",
        "value": "West",
        "source": "original fictional fixture",
        "target": "a"
      }
    ],
    "expected": [
      "c"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  },
  {
    "name": "retrieval chooses matching key",
    "category": "retrieval",
    "events": [
      {
        "id": "a",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "North",
        "source": "original fictional fixture"
      },
      {
        "id": "b",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "lunch",
        "value": "noon",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "b"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "lunch"
  },
  {
    "name": "late observation not a valid-time override",
    "category": "update",
    "events": [
      {
        "id": "b",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-01T00:00:00Z",
        "valid_from": "2026-01-02T00:00:00Z",
        "key": "office",
        "value": "South",
        "source": "original fictional fixture"
      },
      {
        "id": "c",
        "session": "one",
        "kind": "assert",
        "recorded_at": "2026-01-05T00:00:00Z",
        "valid_from": "2026-01-01T00:00:00Z",
        "key": "office",
        "value": "East",
        "source": "original fictional fixture"
      }
    ],
    "expected": [
      "b"
    ],
    "at": "2026-02-01T00:00:00Z",
    "session": "one",
    "query": "office"
  }
]