치명적 예외 lib/excerpt_parser.rb:139:in `start_element'

[znedw (Zach Nedwich)]

업데이트 후 한 카테고리에서 500 Internal Server Error 발생

Sorry, I failed to see the forest for the trees! The site is very clearly up so Postgres is not broken, and the PG error you first quoted must have been some transient error in the past. This is a bug which has been fixed by this commit just a short while ago: If you update Discourse again now, the error should go away.

이것으로 해결되었습니다