Actually, your Postgres credentials still work. I am currently able to connect to the database and I can still view people in the role I grabbed.
I'm not sure how to validate that this is still timely, though... oh, I created a table:
public | hacker_news_1342216769 | table | ruwdncbzdkulsh
With the current timestamp. So, if you changed anything, it hasn't actually taken effect in the part that matters -- the exposed database.