How to access approval history for a project with approved by or pending with details from the PS databases

Hi

I am working with project server 2010. Have been trying to get approval history for project along with the approved by / pending with details, but unable to find the approved by/pending with info from the databases.

Can anyone suggest me which table/view can get me the approved by/pending with info for a project approval history.

Thanks in advance.

Sudhir