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Backport #30805 by @lunny Merging PR may fail because of various problems. The pull request may have a dirty state because there is no transaction when merging a pull request. ref https://github.com/go-gitea/gitea/pull/25741#issuecomment-2074126393 This PR moves all database update operations to post-receive handler for merging a pull request and having a database transaction. That means if database operations fail, then the git merging will fail, the git client will get a fail result. There are already many tests for pull request merging, so we don't need to add a new one. Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>