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[Angela Oduor Lungati, Ushahidi] hey @f1ko have you had a look at the v2 dev documentation?
Here's a look at the entire db structure and which elements in the UI it affects. https://wiki.ushahidi.com/display/WIKI/Tables+Overview
[Angela Oduor Lungati, Ushahidi] v2.7.4 is build on the Kohana framework, which uses a Model-View-Controller architectural pattern, (Kohana 2 if i'm not wrong, archived docs here: http://web.archive.org/web/20110715130625/http://docs.kohanaphp.com//contents ) - you're likely going to have to be looking at three files here - the model, the view, and the controller that affects that functionality.
Is there a particular reason you're working off of v2.7.x and not v3?