错误原因：数据库版本不符合，可能是migration文件夹中的文件有变动但是数据库版本仍旧是原来的
解决方法：
删除 migration 文件夹，并删除数据库中的alembic_version表
重新初始化（init, migrate, upgrade）即可，保留原来数据
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