fix graph info error and upload error

src/core/graphbase.py

@@ -350,10 +350,10 @@ class GraphDatabase:
                 with self.driver.session() as session:
                     graph_info = session.execute_read(query)
 
-            # 添加时间戳
-            from datetime import datetime
-            graph_info["last_updated"] = datetime.now().isoformat()
-            return graph_info
+                    # 添加时间戳
+                    from datetime import datetime
+                    graph_info["last_updated"] = datetime.now().isoformat()
+                    return graph_info
 
         except Exception as e:
             logger.error(f"获取图数据库信息失败：{e}, {traceback.format_exc()}")

src/routers/data_router.py

@@ -127,6 +127,7 @@ async def upload_file(
     basename, ext = os.path.splitext(file.filename)
     filename = f"{basename}_{hashstr(basename, 4, with_salt=True)}{ext}".lower()
     file_path = os.path.join(upload_dir, filename)
+    os.makedirs(upload_dir, exist_ok=True)
 
     with open(file_path, "wb") as buffer:
         buffer.write(await file.read())