Unable to find the table names where recent activity of negotiation work area are stored.

We are trying to derive recent activities that are shown in Negotiation work area to reach number of activities performed on particular negotiation and their details in BIP Reports. We want to know the table names where recent activities are stored.

We are able to find and fetch the main notifications of negotiation from workflow tables. But recent activities details are not stored in those tables. May I know in which tables recent activities of particular negotiations stored and what are the joins.