If you think your question can be deleted, always save its url. On this URL, you will be always capable to see that.

In the first-post or late-answers queue it could be useful to click up everytime, if there are no major problems with the post. This is a reward, which motivates the newbie on his first steps in the site. You don't need to click "No Action Needed", click always up, with the exception if the post is crap (then click down + VtC/lowquality flag + advice to the newbie, in human style).

@Sven I think everything can undone, but why? Now the "late answer" queue will be larger, the transient problem can be handled very easily. I would also very gladly help you, but unfortunately... ;-)

In some weeks it will disappear. I don't think it is problematic. Especially compared to previous big "projects" on the close queue.

@EEAA Thank you, but as I know, deleted content can't be shown on the data SE, and even its metadata since only a short time.

@Sven I didn't asked to show it to me, I suggest for you to see them. At least, see them.

@EEAA It is wonderful. I would suggest to get a list of the (deleted or not) questions closed as offtopic, and sort them by decreasing votecount. There is the content which should have been migrated, but somehow it didn't happen. But anyways if you try to save which seems good content, it is a very good deed.

@Sven You have access to the "deleted" (=made invisible) content of the site, could you sort it by decreasing votecount? Doing similarly with the closed questions doesn't make me happy (not only on the SF, nearly nowhere).

@Sven To me, it is a very strong argument, because I've seen too many good and useful content waiting its removal. Because 10k- users don't even know, what is missing, thus you can't want from them to trust the deletion policy, especially if the closing policy is also highly problematic from many viewpoints.

@Sven Closed questions will be deleted with time. It shouldn't be so, but it is how things are going. Maybe you won't delete it now, but can you guarantee it for the mods of the future in the next 10 years? "It was old and offtopic, so I deleted it" - so will sound the justification. And no power on the Earth will avoid this. 10k- users won't even know, what had they lost. We don't know, what have the site already lost. The damaged closing/delete policy is currently to strongest argument for me to work for the 10k. I want to see, what is lost.

I had a funny comment here, but I've chosen the peace now. :-)

Changing the username is not always okay, on many google-indexed places (mainly on comment replies) the old name remains forever.