要么象更改帐户状态的副作用那样，程序应该自动备份；要么程序必须维护一个审计跟踪以便撤销更改。

Either the program should back up automatically as a side effect of changing the state of an account, or the program must maintain an audit trail that lets you undo the changes.

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从旧表中删除敏感列，并保留那些列中的数据，以便用于审计或者确保可以执行撤销。

Deleting the sensitive columns from the old table and preserving the data from those columns for audit purposes or to ensure the ability to do an undo.

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可以使用标记或标签返回到变更保存点，以撤销变更，或者审计特定的变更。

You can use the tag or label to get back to the point where the changes were saved, to undo a change, or to audit a particular change.

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