sync update from LAN repo (source dhk-1 @ 3b1ec5b4)

offline-backend-20260512/backend/tests/test_db_loop_isolation.py

@@ -0,0 +1,31 @@
+import asyncio
+
+import pytest
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+
+from deerflow.persistence import engine as database
+
+
+@pytest.mark.asyncio
+async def test_sync_bridge_uses_separate_factory_and_keeps_home_pool(tmp_path, monkeypatch):
+    engine = create_async_engine(f"sqlite+aiosqlite:///{tmp_path / 'loop.db'}")
+    factory = async_sessionmaker(engine, expire_on_commit=False)
+    monkeypatch.setattr(database, "_engine", engine)
+    monkeypatch.setattr(database, "_session_factory", factory)
+    monkeypatch.setattr(database, "_engine_loop", asyncio.get_running_loop())
+
+    async def read():
+        isolated = database.get_session_factory()
+        assert isolated is not factory
+        async with isolated() as session:
+            return (await session.execute(text("SELECT 42"))).scalar()
+
+    try:
+        for _ in range(4):
+            assert database.run_db_blocking(read()) == 42
+            assert database.get_session_factory() is factory
+            async with factory() as session:
+                assert (await session.execute(text("SELECT 1"))).scalar() == 1
+    finally:
+        await engine.dispose()