sched: entry-level history cursor so tied occurrence entries paginate exactly once (B4)

tests/wf_transport_rpc_http/test_schedules_rpc.py

@@ -265,6 +265,58 @@ async def test_rpc_schedule_occurrences_pagination_and_pending(tmp_path) -> None
         assert all(row["kind"] != "pending" for row in plain["occurrences"])
 
 
+async def test_rpc_schedule_occurrences_tied_entries_traverse_once(tmp_path) -> None:
+    """Tied admission/stopped entries each arrive exactly once over RPC (B4)."""
+    server = await _seed_server(tmp_path)
+    client, http_client = _client_for(server)
+    store = FileScheduleStore(tmp_path / "store")
+    base = datetime(2026, 9, 8, 12, 0, tzinfo=UTC)
+    async with http_client:
+        await client.create_schedule(
+            schedule_id="s",
+            deployment_id="dep.personal",
+            trigger=_cron(),
+        )
+        recorder = FileScheduleHistoryRecorder(store)
+        recorder.record(
+            HistoryEntry(
+                schedule_id="s",
+                kind="admitted",
+                resolved_at=base,
+                run_id="run-1",
+                revision=1,
+                reason="rev=1",
+                created_at=base,
+            )
+        )
+        recorder.record(
+            HistoryEntry(
+                schedule_id="s",
+                kind="interrupted",
+                resolved_at=base,
+                run_id="run-1",
+                revision=1,
+                reason="fresh-result",
+                checkpoint_id="run-1.000001",
+                created_at=base + timedelta(minutes=5),
+            )
+        )
+
+        seen: list[tuple[str, object]] = []
+        cursor: object = None
+        while True:
+            page = await client.list_schedule_occurrences(
+                schedule_id="s", cursor=cursor, limit=1  # type: ignore[arg-type]
+            )
+            assert page["total"] == 2
+            for row in page["occurrences"]:
+                seen.append((row["kind"], row["checkpoint_id"]))
+            cursor = page["next_cursor"]
+            if cursor is None:
+                break
+        assert seen == [("admitted", None), ("interrupted", "run-1.000001")]
+
+
 async def test_rpc_schedule_error_mapping(tmp_path) -> None:
     server = await _seed_server(tmp_path)
     client, http_client = _client_for(server)