field,unit,note
hours,h,"Clock hours, 8 per assigned shift"
required,people / shift-skill,"Headcount demand, not a predicted workload"
coverage_ratio,fraction,Filled skill slots / required skill slots
overtime_hours,h,Hours above each person's preferred_hours
undesirable_shifts,shifts,Night plus any Saturday/Sunday assignment
date,ISO-8601,"Calendar date in the sample timezone, no DST"