fix: preserve pending occurrence pagination bounds

tests/wf_api/test_schedules.py

@@ -787,6 +787,65 @@ async def test_occurrences_pending_synthesis_first_page_only(tmp_path: Path) ->
     assert all(row["kind"] != "pending" for row in plain["occurrences"])
 
 
+async def test_occurrences_pending_limit_one_traverses_every_row(
+    tmp_path: Path,
+) -> None:
+    """A synthesized pending row must not make the first stored row unreachable."""
+    api, sched_store, _, _, _ = _harness(tmp_path / "pending_limit_one")
+    await api.create_schedule(
+        schedule_id="s", deployment_id="dep.personal", trigger=_cron()
+    )
+    base = ts(2026, 9, 8, 12, 0)
+    recorder = FileScheduleHistoryRecorder(sched_store)
+    for index in range(3):
+        instant = base + timedelta(minutes=index)
+        recorder.record(
+            HistoryEntry(
+                schedule_id="s",
+                kind="admitted",
+                resolved_at=instant,
+                run_id=f"run-{index}",
+                revision=1,
+                reason="rev=1",
+                created_at=instant,
+            )
+        )
+    sched_store.save_candidate(
+        PendingCandidate(
+            schedule_id="s",
+            intended_at=base + timedelta(hours=1),
+            revision=1,
+        ),
+        schedule_id="s",
+    )
+
+    rows: list[dict[str, Any]] = []
+    cursor: str | None = None
+    for _ in range(5):
+        page = await api.list_schedule_occurrences(
+            schedule_id="s", cursor=cursor, limit=1
+        )
+        assert len(page["occurrences"]) <= 1
+        rows.extend(page["occurrences"])
+        cursor = page["next_cursor"]
+        if cursor is None:
+            break
+    else:
+        pytest.fail("occurrence pagination did not terminate")
+
+    assert [row["kind"] for row in rows] == [
+        "pending",
+        "admitted",
+        "admitted",
+        "admitted",
+    ]
+    assert [row["run_id"] for row in rows[1:]] == [
+        "run-0",
+        "run-1",
+        "run-2",
+    ]
+
+
 async def test_occurrences_pagination_visits_tied_entries_once(tmp_path: Path) -> None:
     """One occurrence's admission + stops each appear exactly once (B4).