Read the task metrics

The seven numbers of the task layer on a rolling window (thirty days by default, window_days from 1 to 90), for the account and for each standing delegation: matters closed without the owner, the time from arrival to done, the plans executed as proposed, edited and rejected, the escalations per matter, the corrections after execution, the collisions, the model cost per matter. Read from the receipts, the plans, the escalations and the ledger; nothing is estimated. Requires assistant:read.