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Once upon a time, I created an agent of DESTRUCTION. It got me into such deep doo-doo that I vowed always, always to make agents have reversible effects.
i.e. no more deletions, only soft deletions.
i.e. change a field? Note the value of the oldfield into a backupfield whose item name includes a primitive timestamp.
If I really need to do a quick and dirty one, then I set up the visibility of the agent to just myself, or a group to which I am sure not even power-users will belong to.