diff --git a/decnet/web/db/sqlmodel_repo.py b/decnet/web/db/sqlmodel_repo.py
index fa1e5b9b..1efb544e 100644
--- a/decnet/web/db/sqlmodel_repo.py
+++ b/decnet/web/db/sqlmodel_repo.py
@@ -1111,6 +1111,10 @@ class SQLModelRepository(BaseRepository):
                 text("DELETE FROM lans WHERE topology_id = :t"),
                 params,
             )
+            await session.execute(
+                text("DELETE FROM topology_mutations WHERE topology_id = :t"),
+                params,
+            )
             result = await session.execute(
                 select(Topology).where(Topology.id == topology_id)
             )
diff --git a/tests/topology/test_repo.py b/tests/topology/test_repo.py
index f1fb138d..88e2a25b 100644
--- a/tests/topology/test_repo.py
+++ b/tests/topology/test_repo.py
@@ -138,6 +138,7 @@ async def test_cascade_delete_clears_all_children(repo):
         {"topology_id": t_id, "decky_uuid": d_uuid, "lan_id": lan_id}
     )
     await repo.update_topology_status(t_id, "deploying")
+    await repo.enqueue_topology_mutation(t_id, "noop", {"x": 1})
 
     assert await repo.delete_topology_cascade(t_id) is True
     assert await repo.get_topology(t_id) is None