test(data): vnpy 4.4.0 接口 spike + 端到端冒烟

tests/data/test_spike_vnpy44.py

@@ -0,0 +1,22 @@
+"""Spike: 验证 vnpy 4.4.0 数据库接口。无 NAS 数据时可 skip。"""
+import datetime
+import pytest
+from vnpy.trader.database import get_database
+from vnpy.trader.constant import Interval, Exchange
+
+
+def test_vnpy44_database_interface():
+    """验证 vnpy 4.4.0 数据库接口存在性和签名."""
+    db = get_database()
+    assert hasattr(db, "load_bar_data")
+    assert hasattr(db, "save_bar_data")
+
+    # 测试 load_bar_data 签名
+    bars = db.load_bar_data(
+        symbol="600000",
+        exchange=Exchange.SSE,
+        interval=Interval.DAILY,
+        start=datetime.datetime(2026, 1, 1),
+        end=datetime.datetime(2026, 6, 30),
+    )
+    assert isinstance(bars, list)