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Backport #40167 by @perfectra1n The `repo_stats_update` queue only deduplicates waiting items, so several workers can index the same repository at once, then `UpdateLanguageStats` can lead to transaction deadlock. Use a global lock to avoid concurrent updates, and also helps https://github.com/go-gitea/gitea/pull/39342 to avoid duplicate updates. Co-authored-by: Jon Fuller <jonfuller2012@gmail.com> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>