refactor: decouple database operations from knowledge retrieval nodes (#31981)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/tests/integration_tests/workflow/nodes/knowledge_retrieval/test_knowledge_retrieval_node_integration.py

@@ -0,0 +1,29 @@
+"""
+Integration tests for KnowledgeRetrievalNode.
+
+This module provides integration tests for KnowledgeRetrievalNode with real database interactions.
+
+Note: These tests require database setup and are more complex than unit tests.
+For now, we focus on unit tests which provide better coverage for the node logic.
+"""
+
+import pytest
+
+
+class TestKnowledgeRetrievalNodeIntegration:
+    """
+    Integration test suite for KnowledgeRetrievalNode.
+
+    Note: Full integration tests require:
+    - Database setup with datasets and documents
+    - Vector store for embeddings
+    - Model providers for retrieval
+
+    For now, unit tests provide comprehensive coverage of the node logic.
+    """
+
+    @pytest.mark.skip(reason="Integration tests require full database and vector store setup")
+    def test_end_to_end_knowledge_retrieval(self):
+        """Test end-to-end knowledge retrieval workflow."""
+        # TODO: Implement with real database
+        pass