(TransactionRollbackError) deadlock detected DETAIL: Process 25814 waits for ShareLock on transaction 1549631989; blocked by process 31058. Process 31058 waits for ExclusiveLock on tuple (20,7) of relation 184234377 of database 184233573; blocked by process 25814. HINT: See server log for query details. 'UPDATE pull_requests SET last_updated=%(last_updated)s WHERE pull_requests.id = %(pull_requests_id)s AND pull_requests.project_id = %(pull_requests_project_id)s' {'pull_requests_project_id': 5723, 'pull_requests_id': 2, 'last_updated': datetime.datetime(2017, 10, 2, 12, 46, 39, 377346)}