Fix test failures and workload/websocket behavior

backend/tests/conftest.py

@@ -24,6 +24,11 @@ engine = create_engine(
 )
 TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
+# Ensure app code paths that use SessionLocal directly hit the test DB
+from app.core import database as database_module
+database_module.engine = engine
+database_module.SessionLocal = TestingSessionLocal
+
 
 class MockRedis:
     """Mock Redis client for testing."""
@@ -102,7 +107,11 @@ def db():
 @pytest.fixture(scope="function")
 def mock_redis():
     """Create mock Redis for testing."""
-    return MockRedis()
+    from app.core import redis as redis_module
+    client = redis_module.redis_client
+    if hasattr(client, "store"):
+        client.store.clear()
+    return client
 
 
 @pytest.fixture(scope="function")