Lock model-A scoping: exclude properties without a default plan 🟩

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/repositories/scenario_export/test_scenario_export_postgres_repository.py

@@ -59,3 +59,35 @@ def test_returns_a_row_for_a_property_with_a_default_plan_under_the_scenario(
     assert row.uprn == "100023"
     assert row.post_sap_points == 78.0
     assert row.cost_of_works == 4200.0
+
+
+def test_excludes_requested_properties_without_a_default_plan_under_the_scenario(
+    db_engine: Engine,
+) -> None:
+    # arrange — four requested Properties: only #1 has a default Plan under
+    # scenario 5. #2 has a non-default Plan there, #3 a default Plan under a
+    # different scenario, #4 no Plan at all.
+    with Session(db_engine) as session:
+        for pid in (1, 2, 3, 4):
+            session.add(
+                PropertyRow(id=pid, portfolio_id=100, landlord_property_id=f"LP{pid}")
+            )
+        session.add(
+            PlanModel(portfolio_id=100, property_id=1, scenario_id=5, is_default=True)
+        )
+        session.add(
+            PlanModel(portfolio_id=100, property_id=2, scenario_id=5, is_default=False)
+        )
+        session.add(
+            PlanModel(portfolio_id=100, property_id=3, scenario_id=9, is_default=True)
+        )
+        session.commit()
+
+    # act — request all four.
+    with Session(db_engine) as session:
+        rows = ScenarioExportPostgresRepository(session).rows_for(
+            portfolio_id=100, scenario_id=5, property_ids=[1, 2, 3, 4]
+        )
+
+    # assert — only #1 (a default Plan under scenario 5) survives (model A).
+    assert [r.property_id for r in rows] == [1]