URGENT: MANY Broken Links Activity after Changing URL Slugs

I changed the URL slugs for the activity stream and members (members directory).

Now, in my activity stream, a bunch of links are broken. For example,

replied to the topic How to eat food? in the forum of Food

Bolded text are hyperlinks and the second one in the above quote was broken.

and the member/user's name itself contains a broken link...

How can I update all of these links? I'm okay getting this done manually.

Please respond as soon as possible. All help is appreciated. Thanks in advance.