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Some time ago I flagged this as not-an-answer.

For a while, link to this flagged answer has been visible in my flagging history (flag was declined in case if that matters). As far as I remember it also has been counted among my other declined flags.

Recently I discovered that link to answer is not present in my flagging history anymore. Nor does it impact the number of declined flags anymore.

Some other flagged answers that disappeared in a similar fashion are listed in this question:

As far as I can tell, diamond moderators can't see these flags, either: "looking through your flagging history and I don't see flags that were declined on these questions. I also don't see anything on the individual flag histories for each post" - comments from Bill the Lizard♦ in this question:

What happened to my flagging history?

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Forgetting context of the question for a moment, what the hell is a NAN? In fact, in context of the question what the hell is it? "Not a number" aside... –  Grant Thomas Oct 22 '11 at 11:06
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Maybe it should be NAA ("not an answer"), which is what gnat seems talking of. –  kiamlaluno Oct 22 '11 at 11:34
    
@Mr.Disappointment NAN is the thing that is gone. I mean, links to particular answers flagged as N-ot an AN-swer are gone from my flagging history. Links to answers I thought about as described in the flag - "should possibly be an edit, a comment, another question, or deleted altogether" –  gnat Oct 22 '11 at 13:08
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1 Answer

up vote 0 down vote accepted

Most likely flags were deleted by someone of Stack Exchange team. I can not think of any other reason for why flags disappeared from my flagging history even for diamond moderators.

Most likely, there was some sort of cleanup going on there.


PS. To downvoter:
        http://i.stack.imgur.com/SoUYy.jpg

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We don't delete flags like this...I honestly see no history of a flag on that question at all, or how it would disappear (we don't hard delete flags). –  Nick Craver Dec 14 '11 at 11:30
    
@NickCraver I see thanks. Can you think of any other reason for why flags would disappear other than hard deletion? As you may see from the prior question I mentioned, few mods have seen my flags there indeed –  gnat Dec 14 '11 at 12:16
    
Other than your account being merged (I don't see that ever happening to you), no...the records should be in the database. Soft delete refers to we have a DeletionDate column and it's populated...hard delete is the database row is literally gone, that seems to be the case here, if it's a bug I'm not seeing it....but such is the nature of bugs so... We have some changes to how flags are stored coming up (they're in a few different locations for posts/comments currently, we want to clean that up), if there is a bug it'll disappear with that changeover. –  Nick Craver Dec 14 '11 at 12:22
    
@NickCraver I see - interesting. I recall one account merge for sure: P.SE+SO in August - seems there were none except for this one. As for row deletion well without knowing if you have audit records for DB changes or archived snapshots for past dates it is hard to tell what happened. If there is sort of "wayback machine", it would be possible eg to check for row deletions done between Oct 15 and 22 –  gnat Dec 14 '11 at 13:03
    
@NickCraver "We don't delete flags like this" well as far as I can tell at SU it happened once that flag decisions were reversed somehow. I updated an answer with the link to SU example –  gnat Dec 21 '11 at 9:05
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