[全量] 初始化项目代码、配置、文档及Agent协同harness

langchain-chat/server/db/base.py

@@ -0,0 +1,16 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base, DeclarativeMeta
+from sqlalchemy.orm import sessionmaker
+
+from configs import SQLALCHEMY_DATABASE_URI
+import json
+
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URI,
+    json_serializer=lambda obj: json.dumps(obj, ensure_ascii=False),
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base: DeclarativeMeta = declarative_base()