Amazon Cognito now provides user pool deletion protection
You can now activate deletion protection for your Amazon Cognito user pools. When you configure a user pool with deletion protection, the pool cannot be deleted by any user. Deletion protection is now active by default for new user pools created through the AWS Console. You can activate or deactivate deletion protection for an existing user pool in the AWS Console, the AWS Command Line Interface, and API. Deletion protection prevents you from requesting the deletion of a user pool unless you first modify the pool and deactivate deletion protection.
You can now activate deletion protection for your Amazon Cognito user pools. When you configure a user pool with deletion protection, the pool cannot be deleted by any user. Deletion protection is now active by default for new user pools created through the AWS Console. You can activate or deactivate deletion protection for an existing user pool in the AWS Console, the AWS Command Line Interface, and API. Deletion protection prevents you from requesting the deletion of a user pool unless you first modify the pool and deactivate deletion protection.
Read more in the Deletion Protection section of the Amazon Cognito Developer Guide.