M8-R03B: keep meter swap recompute in caller transaction

tests/test_energy_cost.py

@@ -2176,6 +2176,32 @@ class TestComputeClosedPeriods:
 
 
 class TestRecomputeRange:
+    def test_default_commit_is_visible_to_a_new_session(self, energy_db: Session) -> None:
+        """The public recompute API retains its standalone commit behaviour."""
+        _setup_manual_scenario(energy_db)
+
+        assert recompute_range(energy_db, _T0, _T1) == 1
+        assert energy_db.bind is not None
+        with Session(energy_db.bind) as observer:
+            row = observer.execute(
+                select(EnergyCostPeriod).where(EnergyCostPeriod.period_start == _T0)
+            ).scalar_one()
+            assert row.degraded is False
+
+    def test_commit_false_leaves_recompute_for_caller_to_rollback(self, energy_db: Session) -> None:
+        """Caller-owned recompute writes disappear entirely after rollback."""
+        _setup_manual_scenario(energy_db)
+
+        assert recompute_range(energy_db, _T0, _T1, commit=False) == 1
+        energy_db.rollback()
+
+        assert energy_db.bind is not None
+        with Session(energy_db.bind) as observer:
+            rows = observer.execute(
+                select(EnergyCostPeriod).where(EnergyCostPeriod.period_start == _T0)
+            ).scalars().all()
+            assert rows == []
+
     def test_overwrites_existing_rows(self, energy_db: Session) -> None:
         """recompute_range must overwrite non-degraded rows (explicit opt-in)."""
         contract = _make_contract(energy_db, kind="manual", active=True)