fix(A1): enforce_single_active via roadmaps join (pytest)

roadmap_items hat kein initiative_id — Single-Active-Update join auf roadmaps. test_ap20e an Uebungssets angepasst.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/services/maturity_practice.py

@@ -56,13 +56,15 @@ def enforce_single_active_maturity_stage(
     """At most one maturity_stage may be active."""
     cur.execute(
         """
-        UPDATE roadmap_items
+        UPDATE roadmap_items ri
         SET status = 'planned', updated_at = NOW()
-        WHERE tenant_id = %s
-          AND initiative_id = %s
-          AND item_type = 'maturity_stage'
-          AND status IN ('active', 'at_risk')
-          AND id != %s
+        FROM roadmaps r
+        WHERE ri.roadmap_id = r.id
+          AND ri.tenant_id = %s
+          AND r.initiative_id = %s
+          AND ri.item_type = 'maturity_stage'
+          AND ri.status IN ('active', 'at_risk')
+          AND ri.id != %s
         """,
         (tenant_id, initiative_id, keep_active_id),
     )

backend/tests/test_ap20e_maturity_transition.py

@@ -51,8 +51,11 @@ def test_maturity_stage_reached_rotates_recurring(client):
         headers=_auth(token),
     ).json()
     titles = {r["title"]: r["status"] for r in recurring}
-    assert titles.get("Tägliche Übung") == "paused"
-    assert any(t.startswith("Übung — Stufe 2") for t in titles)
+    assert titles.get("Vorbeuge-Dehnung") == "paused"
+    assert titles.get("Hüftöffner (Schmetterling)") == "paused"
+    assert any(
+        t.startswith("Seitlicher Spagat") and titles[t] == "active" for t in titles
+    )
 
     items_after = client.get(
         f"/api/initiatives/{initiative_id}/roadmap/items",