As described in T88328, the desired direction of the Sprint Burndown Chart is to remove dependency on Maniphest Task Status as currently determined by evaluating all transactions from a particular task. Because a task can be assigned to multiple projects, the discrimination of the join for a task transaction to a project is complicated. By evaluating only task status changes as transaction type "projectcolumn" (those that occur within the context of a specific project workboard), and assigning particular column names with status designations, this problem can be eliminated.