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* Make account endorsements idempotent (fix #19045) * Accept suggestion to use exists? instead of find_by + nil check Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh> * fix logic (unless, not if) * switch to using `find_or_create_by!` Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>