* Begin of the insertionCreate a data migration that:
* SplitsEnd of the insertion Begin of the deletion SplitEnd of the deletion 'involved' in existing notification settings into assignee and responsible. Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Begin of the insertionAddsEnd of the insertion Begin of the deletion AddEnd of the deletion start\_date, due\_date and overdue notification setting into existing notification settings. Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Begin of the insertionstart\_dateEnd of the insertion Begin of the deletion  start\_dateEnd of the deletion set to 24 (hours) Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Begin of the insertiondue\_dateEnd of the insertion Begin of the deletion  due\_dateEnd of the deletion set to 24 (hours) Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Begin of the insertionoverdueEnd of the insertion Begin of the deletion  overdueEnd of the deletion set to null