"""数据库初始化"""
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from config import DATABASE_URL

engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()


def get_db():
    """获取数据库会话（FastAPI 依赖注入用）"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()