修改属性图节点的层级结构，新增子父级关系

backend/app/engine/vectordb.py

@@ -3,7 +3,6 @@ from llama_index.vector_stores.chroma import ChromaVectorStore
 from llama_index.vector_stores.qdrant import QdrantVectorStore
 from qdrant_client import qdrant_client
 from llama_index.graph_stores.neo4j import Neo4jPropertyGraphStore
-
 qclient = None
 
 def get_qdrant_vector_store(docType:str):
@@ -74,6 +73,12 @@ def get_vector_store(docType:str):
     return store
 
 def get_Neo4j_Graph_Store(docType:str):
+    from neo4j import GraphDatabase
+    driver = GraphDatabase.driver(os.getenv('NEO4J_URL'), auth=(os.getenv('NEO4J_USERNAME'), os.getenv('NEO4J_PASSWORD')))
+    with driver.session() as session:
+        session.run("MATCH (n) DETACH DELETE n")
+    driver.close()
+
     neo4jStore = Neo4jPropertyGraphStore(
         username= os.getenv('NEO4J_USERNAME'),
         password= os.getenv('NEO4J_PASSWORD'),