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This commit adds timeout that is expected to be used as a prevention of long-running queries. Any session within the transaction will be terminated after spanning longer than this timeout. However, this timeout is not applied to prepared transactions. Only transactions with user connections are affected. Discussion: https://postgr.es/m/CAAhFRxiQsRs2Eq5kCo9nXE3HTugsAAJdSQSmxncivebAxdmBjQ%40mail.gmail.com Author: Andrey Borodin <amborodin@acm.org> Author: Japin Li <japinli@hotmail.com> Author: Junwang Zhao <zhjwpku@gmail.com> Reviewed-by: Nikolay Samokhvalov <samokhvalov@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com> Reviewed-by: bt23nguyent <bt23nguyent@oss.nttdata.com> Reviewed-by: Yuhang Qiu <iamqyh@gmail.com>