Refine runtime data flow and UI layering

backend/tests/test_runtime_service_app.py

@@ -17,6 +17,7 @@ def test_runtime_service_routes_are_exposed():
     assert "/api/status" in paths
     assert "/api/runtime/start" in paths
     assert "/api/runtime/stop" in paths
+    assert "/api/runtime/cleanup" in paths
     assert "/api/runtime/current" in paths
     assert "/api/runtime/gateway/port" in paths
 
@@ -192,3 +193,45 @@ def test_runtime_service_update_runtime_config_persists_bootstrap(monkeypatch, t
     assert payload["bootstrap"]["schedule_mode"] == "intraday"
     assert payload["resolved"]["interval_minutes"] == 15
     assert "interval_minutes: 15" in (run_dir / "BOOTSTRAP.md").read_text(encoding="utf-8")
+
+
+def test_prune_old_timestamped_runs_keeps_named_runs(monkeypatch, tmp_path):
+    runs_dir = tmp_path / "runs"
+    runs_dir.mkdir()
+
+    keep_dirs = ["20260324_110000", "20260324_120000"]
+    prune_dir = "20260324_100000"
+    named_dir = "smoke_fullstack"
+
+    for name in [*keep_dirs, prune_dir, named_dir]:
+        (runs_dir / name).mkdir(parents=True)
+
+    monkeypatch.setattr(runtime_module, "PROJECT_ROOT", tmp_path)
+
+    pruned = runtime_module._prune_old_timestamped_runs(keep=1, exclude_run_ids={"20260324_120000"})
+
+    assert prune_dir in pruned
+    assert (runs_dir / named_dir).exists()
+    assert (runs_dir / "20260324_120000").exists()
+    assert (runs_dir / "20260324_110000").exists()
+
+
+def test_runtime_cleanup_endpoint_prunes_old_runs(monkeypatch, tmp_path):
+    runs_dir = tmp_path / "runs"
+    runs_dir.mkdir()
+
+    for name in ["20260324_090000", "20260324_100000", "20260324_110000", "smoke_fullstack"]:
+        (runs_dir / name).mkdir(parents=True)
+
+    monkeypatch.setattr(runtime_module, "PROJECT_ROOT", tmp_path)
+    monkeypatch.setattr(runtime_module, "_is_gateway_running", lambda: False)
+
+    with TestClient(create_app()) as client:
+        response = client.post("/api/runtime/cleanup?keep=1")
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["status"] == "ok"
+    assert sorted(payload["pruned_run_ids"]) == ["20260324_090000", "20260324_100000"]
+    assert (runs_dir / "20260324_110000").exists()
+    assert (runs_dir / "smoke_fullstack").exists()