Problem

Current KPIs are calculating the average task processing time per each role (translator, reviewer, translatorCheck) as average of values:
LEK_taskUserAssoc.finishedDate - LEK_taskUserAssoc.assignmentDate.

Solution

These KPIs should be calculated is the timespan from where the task switched to open for a role until when it was finished. We need to record the date, when the status was switched to open and then go from there with the calculation.