The wdqs-tutorial tool has a world-readable dbdump file:
lucaswerkmeister-wmde@tools-sgebastion-10:~$ ls -l ~tools.wdqs-tutorial/dbdump -rw-r--r-- 1 wmde-leszek tools.wdqs-tutorial 5820375 Jun 22 2020 /data/project/wdqs-tutorial/dbdump
It includes some user registrations, including email addresses and hashed passwords:
-- -- Table structure for table `wp9c_users` -- DROP TABLE IF EXISTS `wp9c_users`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `wp9c_users` ( `ID` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `user_login` varchar(60) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `user_pass` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `user_nicename` varchar(50) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `user_email` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `user_url` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `user_registered` datetime NOT NULL DEFAULT '0000-00-00 00:00:00', `user_activation_key` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', `user_status` int(11) NOT NULL DEFAULT '0', `display_name` varchar(250) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '', PRIMARY KEY (`ID`), KEY `user_login_key` (`user_login`), KEY `user_nicename` (`user_nicename`), KEY `user_email` (`user_email`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci; /*!40101 SET character_set_client = @saved_cs_client */;
INSERT INTO `wp9c_users` VALUES (1,'admin','$P$REDACTED','admin','REDACTED@gmail.com','','2019-10-14 14:37:11','',0,'admin'),(2,'testadmin','$P$REDACTED','testadmin','REDACTED@wikimedia.de','','2020-05-09 15:53:18','',0,'testadmin');
This file must be made readable only to the tool user and nobody else (or better yet, deleted entirely).