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模型中一个selection类型字段原本的选项有 已登录/未登录/异常。现在我要删除异常这个选项，添加其他选项，也就是新的选项应该是 已登录/未登录/其他，但是我的历史数据中选了异常的记录要正常显示。请问应该怎么做？