New visit id for new visitor

Support & Bugs
1

Hi

I am logging the userid s in piwik log_visit table.

  1. Once a visitor signs out, it must be a new visit.
  2. And also, a new user can log into the same system. But piwik logs the new vistor as a know visitor with same visit id.

How can i make these two visits as a new visit?

Anita