Make the sessions table polymorphic

[perepaul]

If the laravel sessions table is polymorphic, when using multiple guards and user providers, we'll be able to logout user devices per guard/user provider.
For example, the current table just features user_id column and it causes conflict when two guards of same id is logged in.
To further explain my point, if a lecturer with an id of 1 in the lectures table is logged in and a student with id of 1 is also logged in the two IDs clash on the sessions table making the deletion of other devices a hard nut to crack. I know there is delete other devices in the Auth facade. But individual deleting is very difficult to achieve.