solution for the issue discussed here: http://forum.piwik.org/read.php?2,87411
problem summary: visits are assigned to the last customer to log in to the site using piwik tracking when two or more customers are using the same computer during the lifetime of a piwik cookie
solution summary: I replaced the uuid based on browser info and timestamp with one based on the same browser info, a session id passed to the Tracker object at instantiation and a date string (to force a new visit if the session id did not expire after date change).
Keywords: visit session cookie
Attachment: add custom session id to identify unique visits based on who is logged in the site
please review :)
Thanks for the patch, nice idea, but probably we won't include this as a feature.