During the last a couple of days I came across the same problem twice.
The same person keeps asking questions and then deleting them.
I'm afraid these links are not visible for everyone, but definitely are available for moderators:
The first time I spend 30 minutes to write a query which is no longer available for anyone. The second time, the person asks almost the same question which requires very minor fixes to the original solution. Many people are trying to help, but eventually question is deleted again.
This is quite demotivating.
How often person can do that?
Can I suggest marking such persons so other people would not be wasting time trying to help?