Remove "Assignment" 1, 2, or 3 When Goal is Completed or Moved to History

When a Goal is moved to History, the assignment stays with the goal, continuing to appear in the customer grid if formatted as such.

I think it would be better for the system to prompt the user "Do you want to unassign this Goal before moving it into History?" allowing those who still want it displayed to stay, and others to have their Goals cleaned up and re-prioritized.