修复学校站点重复导致无法升级的bug

pt_site/apps.py

@@ -18,6 +18,9 @@ def app_ready_handler(sender, **kwargs):
             logger.info('更新规则中，返回结果为True为新建，为False为更新，其他是错误了')
             btschool = Site.objects.filter(url='http://47.242.110.63/').first()
             if btschool:
+                bt_school = Site.objects.filter(url='https://pt.btschool.club/').first()
+                if bt_school:
+                    bt_school.delete()
                 btschool.url = 'https://pt.btschool.club/'
                 btschool.save()
             for site_rules in data: