[Question]update user roles failed about casbin HOT 4 OPEN

@tangyang9464 @JalinWang

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I set redis watcher for casbin,when redis service crash, casbin delete user report error,but the user is deleted successful
This is an operation to update a user role. Subsequent operations to add a role for the user cannot be performed properly, and the previous operations to delete the user cannot be rolled back. What should I do in this case

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@daijiezou plz provide reproduce steps and code example

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code example:

mycasbin.Casbin() is a enforcer instance

// step1: delete the role owned by the original user
if _, err := mycasbin.Casbin().DeleteRolesForUser(strconv.Itoa(roleId)); err != nil {
return
}

// step2: update the roles owned by the user
_, err = mycasbin.Casbin().AddRolesForUser(strconv.Itoa(roleId), req.PermissionList)
if err != nil {
return
}

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