As far as I understand, empty tags should be removed after 24h. But right now, the tags and are still around even though I'm 100% certain that they have been empty for much more than 24h. There is also , but I don't know for sure that it has been emptied less than 24h ago. What is going on?

Even stranger is the case of . This question was migrated twice, once to main then back to meta. When it was migrated to main, since the tag discussion doesn't exist there, it was marked untagged. When it was migrated back, it apparently stayed around somewhere in the DB and fills up the tag (see for yourself), which cannot disappear now.

  • 1
    $\begingroup$ A shout-out to this bug report, writing questions about tags is always annoying. $\endgroup$ Dec 30, 2014 at 8:12
  • $\begingroup$ If I'm not mistaken, the script for removal of tags runs daily, and removes tags that have not been used for 24 hours before the script runs, so in case of unfortunate timing, it could take up to 48 hours to have the tag removed. Is the "much more than 24h" also more than 48h? Also, it might be that in the interim there appeared a question with the tag which was then removed, which would delay the removal of the tag (not very likely, but possible). $\endgroup$ Dec 30, 2014 at 12:43
  • $\begingroup$ +1, especially for untagged. $\endgroup$
    – apnorton
    Dec 30, 2014 at 14:16
  • $\begingroup$ @DanielFischer Yes, it's been at least three days. $\endgroup$ Dec 30, 2014 at 14:36
  • $\begingroup$ Aha. Strange. We have a lot of empty tags, but most of them are synonyms - untagged is special, it's baked into the system, needed for some migrations (I don't know if it ever goes away completely and is re-created when needed, or it stays regardless). $\endgroup$ Dec 30, 2014 at 14:47
  • $\begingroup$ chain-rule was removed here seven hours ago, so that's not been unused long enough. $\endgroup$ Dec 30, 2014 at 14:52
  • $\begingroup$ @DanielFischer untagged is removed by the 03:00 UTC auto-deleter (just like regular tags) and is recreated as needed, fwiw. $\endgroup$
    – senshin
    Dec 30, 2014 at 18:16
  • $\begingroup$ @senshin Thanks for the info. $\endgroup$ Dec 30, 2014 at 18:36

1 Answer 1


was used recently, it was removed here and here seven hours ago.

was also used recently, removed here (and possibly elsewhere) by the same user at approximately the same time.

Eric Stucky also cleared at around the same time. Thanks to him for cleaning up some tags.


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