# import os
# from sqlalchemy import create_engine
# from sqlalchemy.ext.declarative import declarative_base
# from sqlalchemy.orm import sessionmaker
# from sqlalchemy.exc import SQLAlchemyError

# # MySQL 데이터베이스 설정
# DATABASE_URL = os.getenv("DATABASE_URL", "mysql+mysqlconnector://root:root@10.10.10.180:3306/chathess")

# # SQLAlchemy 엔진 생성 (예외 처리 추가)
# try:
#     engine = create_engine(DATABASE_URL)
#     print("Database engine created successfully.")
# except SQLAlchemyError as e:
#     print("Failed to create database engine.")
#     print("Error:", e)
#     engine = None

# # 세션 생성 (엔진이 None이면 세션 초기화 안 함)
# if engine:
#     SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
# else:
#     SessionLocal = None

# # Base 클래스 생성
# Base = declarative_base()

# # 데이터베이스 세션 의존성
# def get_db():
#     if not SessionLocal:
#         print("Database session is not available.")
#         raise RuntimeError("Database is not initialized.")
    
#     db = SessionLocal()
#     try:
#         yield db
#     finally:
#         db.close()