emptyTimetableEntry = TimetableEntry
  { _timetableEntryParentId       = 0
  , _timetableEntryId             = TimetableEntryId 0
  , _timetableEntryRemainingSlots = 0
  , _timetableEntryDate           = ""
  , _timetableEntryStartTime      = ""
  , _timetableEntryEndTime        = ""
  }
emptyTimetableEntry = TimetableEntry
  { _timetableEntryParentId       = 0
  , _timetableEntryId             = TimetableEntryId 0
  , _timetableEntryRemainingSlots = 0
  , _timetableEntryDate           = ""
  , _timetableEntryStartTime      = ""
  , _timetableEntryEndTime        = ""
  }
emptyTimetableEntry = TimetableEntry
  { _timetableEntryParentId       = 0
  , _timetableEntryId             = TimetableEntryId 0
  , _timetableEntryRemainingSlots = 0
  , _timetableEntryDate           = ""
  , _timetableEntryStartTime      = ""
  , _timetableEntryEndTime        = ""
  }