Hi plog,
At the moment I am as basic as below for the employee side.
EmployeeID, EmployeeName
WorkingHoursID, EmployeeID, MondayStart, MondayEnd (and remaining weekdays)
TeaBreakID, EmployeeID, MondayTeaStart, MondayTeaEnd (and remaining weekdays)
LunchBreakID, EmployeeID, MondayLunchStart...