Add tests for the db lock

tests/conftest.py

@@ -35,6 +35,7 @@ from tests.helpers import (
     ChatModelOptionsFactory,
     OfflineChatProcessorConversationConfigFactory,
     OpenAIProcessorConversationConfigFactory,
+    ProcessLockFactory,
     SubscriptionFactory,
     UserConversationProcessorConfigFactory,
     UserFactory,
@@ -206,6 +207,12 @@ def search_models(search_config: SearchConfig):
     return search_models
 
 
+@pytest.mark.django_db
+@pytest.fixture
+def default_process_lock():
+    return ProcessLockFactory()
+
+
 @pytest.fixture
 def anyio_backend():
     return "asyncio"