removed neo4j and replaced with rustworkx

main.py

@@ -449,7 +449,6 @@ async def process_query(user_query: str, sse_queue: asyncio.Queue):
             state['graph_rag'].set_on_event_callback(on_event_callback)
 
             start = time.time()
-            state['graph_rag'].initialize_schema()
             await state['graph_rag'].process_graph(
                 user_query,
                 similarity_threshold=0.8,