refactor: replace Zep Cloud memory with local JSON file storage

backend/app/api/graph.py

@@ -283,17 +283,6 @@ def build_graph():
     try:
         logger.info("=== 开始构建图谱 ===")
 
-        # 检查配置
-        errors = []
-        if not Config.ZEP_API_KEY:
-            errors.append(t('api.zepApiKeyMissing'))
-        if errors:
-            logger.error(f"配置错误: {errors}")
-            return jsonify({
-                "success": False,
-                "error": t('api.configError', details="; ".join(errors))
-            }), 500
-
         # 解析请求
         data = request.get_json() or {}
         project_id = data.get('project_id')
@@ -387,8 +376,8 @@ def build_task():
                 )
 
                 # 创建图谱构建服务
-                builder = GraphBuilderService(api_key=Config.ZEP_API_KEY)
-                
+                builder = GraphBuilderService()
+
                 # 分块
                 task_manager.update_task(
                     task_id,
@@ -572,20 +561,14 @@ def get_graph_data(graph_id: str):
     获取图谱数据（节点和边）
     """
     try:
-        if not Config.ZEP_API_KEY:
-            return jsonify({
-                "success": False,
-                "error": t('api.zepApiKeyMissing')
-            }), 500
-
-        builder = GraphBuilderService(api_key=Config.ZEP_API_KEY)
+        builder = GraphBuilderService()
         graph_data = builder.get_graph_data(graph_id)
-        
+
         return jsonify({
             "success": True,
             "data": graph_data
         })
-        
+
     except Exception as e:
         return jsonify({
             "success": False,
@@ -597,16 +580,10 @@ def get_graph_data(graph_id: str):
 @graph_bp.route('/delete/<graph_id>', methods=['DELETE'])
 def delete_graph(graph_id: str):
     """
-    删除Zep图谱
+    删除本地图谱
     """
     try:
-        if not Config.ZEP_API_KEY:
-            return jsonify({
-                "success": False,
-                "error": t('api.zepApiKeyMissing')
-            }), 500
-
-        builder = GraphBuilderService(api_key=Config.ZEP_API_KEY)
+        builder = GraphBuilderService()
         builder.delete_graph(graph_id)
 
         return jsonify({

backend/app/api/simulation.py

@@ -57,18 +57,12 @@ def get_graph_entities(graph_id: str):
         enrich: 是否获取相关边信息（默认true）
     """
     try:
-        if not Config.ZEP_API_KEY:
-            return jsonify({
-                "success": False,
-                "error": t('api.zepApiKeyMissing')
-            }), 500
-
         entity_types_str = request.args.get('entity_types', '')
         entity_types = [t.strip() for t in entity_types_str.split(',') if t.strip()] if entity_types_str else None
         enrich = request.args.get('enrich', 'true').lower() == 'true'
-        
+
         logger.info(f"获取图谱实体: graph_id={graph_id}, entity_types={entity_types}, enrich={enrich}")
-        
+
         reader = ZepEntityReader()
         result = reader.filter_defined_entities(
             graph_id=graph_id,
@@ -94,12 +88,6 @@ def get_graph_entities(graph_id: str):
 def get_entity_detail(graph_id: str, entity_uuid: str):
     """获取单个实体的详细信息"""
     try:
-        if not Config.ZEP_API_KEY:
-            return jsonify({
-                "success": False,
-                "error": t('api.zepApiKeyMissing')
-            }), 500
-
         reader = ZepEntityReader()
         entity = reader.get_entity_with_context(graph_id, entity_uuid)
 
@@ -127,14 +115,8 @@ def get_entity_detail(graph_id: str, entity_uuid: str):
 def get_entities_by_type(graph_id: str, entity_type: str):
     """获取指定类型的所有实体"""
     try:
-        if not Config.ZEP_API_KEY:
-            return jsonify({
-                "success": False,
-                "error": t('api.zepApiKeyMissing')
-            }), 500
-
         enrich = request.args.get('enrich', 'true').lower() == 'true'
-        
+
         reader = ZepEntityReader()
         entities = reader.get_entities_by_type(
             graph_id=graph_id,

backend/app/config.py

@@ -32,8 +32,8 @@ class Config:
     LLM_BASE_URL = os.environ.get('LLM_BASE_URL', 'https://api.openai.com/v1')
     LLM_MODEL_NAME = os.environ.get('LLM_MODEL_NAME', 'gpt-4o-mini')
 
-    # Zep配置
-    ZEP_API_KEY = os.environ.get('ZEP_API_KEY')
+    # 本地图谱存储目录
+    GRAPH_STORAGE_DIR = os.path.join(os.path.dirname(__file__), '../uploads/graphs')
 
     # 文件上传配置
     MAX_CONTENT_LENGTH = 50 * 1024 * 1024  # 50MB
@@ -69,7 +69,7 @@ def validate(cls):
         errors = []
         if not cls.LLM_API_KEY:
             errors.append("LLM_API_KEY 未配置")
-        if not cls.ZEP_API_KEY:
-            errors.append("ZEP_API_KEY 未配置")
+        # 确保图谱存储目录存在
+        os.makedirs(cls.GRAPH_STORAGE_DIR, exist_ok=True)
         return errors