Today I ran this SQL on my #friendica database:
MariaDB [xxx]> UPDATE `item` SET `body`=REPLACE(`body`,'oracle.skilledtests.com','invalid-domain') WHERE `body` LIKE '%skilledtests.com%s';
Query OK, 94 rows affected (1 min 1.45 sec)
Rows matched: 94 Changed: 94 Warnings: 0
Normally I try to avoid such "hacky" things as they may hurt the application. But here I made an exception. Sadly, #ErkanYilmaz stepped down and left #question bot and the famous #fediverse grou left to death. Now it seems also the domain is gone. His decision but as you can see here, a "domain-shark" (someone hunting with automated scripts for left and popular domains) took it over and parked it.
I ask you not to always stay with us, your decision and I respect it. But please consider to ask someone here to take over the domain and delink it from all other nodes or else, "thanks" to the #page-ranking by #googlle it still has an attractive rank and sure such people will give everything to grab it and put it on sale with for-money generated "content" (#fake-content ) on it.
So, the other administrators, please repeat above query for any parked (given up) domain you can find.