I was trying to update the cognito user pool, but the cloudformation remove all user record.
For the user who affected, you can still using IVE calc on myportal only, you won't able to access you data on ive.miklet.pro.
But its ok, there is a way to restore your current data.
If you don't want to keep you record, just reinstall the userscript and create a new account.

Here are the steps:

First, register a new account.
Then, go copy the new account secret key.
Next, open Violentmonkey dashboard, edit the userscript and go to "Value" tab
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Finally, the toughest job, find your old secret key and replace with the new one. (careful, do not remove double quote or slash)