fix: stabilize maintenance flow run/resume and procedural scrolling

backend/tests/test_maintenance_schedules.py

@@ -98,6 +98,23 @@ async def test_get_schedule_not_found(client: AsyncClient, auth_headers: dict):
     assert resp.status_code == 404
 
 
+@pytest.mark.asyncio
+async def test_cannot_create_schedule_for_non_maintenance_tree(
+    client: AsyncClient, auth_headers: dict, test_tree: dict
+):
+    """Schedules are restricted to maintenance flows."""
+    resp = await client.post(
+        "/api/v1/maintenance-schedules",
+        json={
+            "tree_id": test_tree["id"],
+            "cron_expression": "0 0 1 * *",
+            "timezone": "UTC",
+        },
+        headers=auth_headers,
+    )
+    assert resp.status_code == 400
+
+
 @pytest.mark.asyncio
 async def test_cannot_schedule_other_teams_tree(client: AsyncClient, auth_headers: dict, test_db):
     """User cannot create a schedule for a tree belonging to another team."""

backend/tests/test_sessions.py

@@ -882,6 +882,79 @@ class TestSessions:
         assert len(data) >= 1
         assert test_tree["name"] in data[0]["tree_snapshot"]["name"]
 
+    @pytest.mark.asyncio
+    async def test_filter_sessions_by_tree_id(
+        self, client: AsyncClient, auth_headers: dict, test_tree: dict
+    ):
+        """Test filtering sessions by tree_id."""
+        other_tree_response = await client.post(
+            "/api/v1/trees",
+            json={
+                "name": "Other Tree",
+                "description": "Second tree for filter test",
+                "category": test_tree["category"],
+                "tree_structure": test_tree["tree_structure"],
+            },
+            headers=auth_headers,
+        )
+        assert other_tree_response.status_code == 201
+        other_tree_id = other_tree_response.json()["id"]
+
+        await client.post(
+            "/api/v1/sessions",
+            json={"tree_id": test_tree["id"], "ticket_number": "TREE-A"},
+            headers=auth_headers,
+        )
+        await client.post(
+            "/api/v1/sessions",
+            json={"tree_id": other_tree_id, "ticket_number": "TREE-B"},
+            headers=auth_headers,
+        )
+
+        response = await client.get(
+            f"/api/v1/sessions?tree_id={test_tree['id']}",
+            headers=auth_headers,
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data) >= 1
+        assert all(item["tree_id"] == test_tree["id"] for item in data)
+
+    @pytest.mark.asyncio
+    async def test_list_sessions_supports_size_and_page_params(
+        self, client: AsyncClient, auth_headers: dict, test_tree: dict
+    ):
+        """Test frontend-compatible page/size query params."""
+        await client.post(
+            "/api/v1/sessions",
+            json={"tree_id": test_tree["id"], "ticket_number": "P1"},
+            headers=auth_headers,
+        )
+        await client.post(
+            "/api/v1/sessions",
+            json={"tree_id": test_tree["id"], "ticket_number": "P2"},
+            headers=auth_headers,
+        )
+        await client.post(
+            "/api/v1/sessions",
+            json={"tree_id": test_tree["id"], "ticket_number": "P3"},
+            headers=auth_headers,
+        )
+
+        first_page = await client.get("/api/v1/sessions?size=2&page=1", headers=auth_headers)
+        assert first_page.status_code == 200
+        first_data = first_page.json()
+        assert len(first_data) == 2
+
+        second_page = await client.get("/api/v1/sessions?size=2&page=2", headers=auth_headers)
+        assert second_page.status_code == 200
+        second_data = second_page.json()
+        assert len(second_data) >= 1
+
+        first_ids = {item["id"] for item in first_data}
+        second_ids = {item["id"] for item in second_data}
+        assert first_ids.isdisjoint(second_ids)
+
     @pytest.mark.asyncio
     async def test_filter_sessions_by_started_date_range(
         self, client: AsyncClient, auth_headers: dict, test_tree: dict