Update database record but no change on chat

I'm developing a simple update on the openfire database, where I randomly put different values on "Chat Room Greeting" field (fastpath plugin) .

But the problem is that the value isn't updated in the admin interface. But when I change the field directly from admin interface, it works.

Is there a flag or something that I need to 'tell' the application that has changes in the database??

thanks

Edit

I just learned all settings are cached by default...

So.. How can I configure to not cache a specific setting from plugin FastPath?

What I need to do is to manually set a new value for a field in the database (table fpChatSetting, acceptedChat_text), and since this is being made outside the openfire's interface, the value isn't being cached, and consequently not updated. So, this way I want to tell I dont want to cache that specific database field.

How can I manage to do that?