For the original poster (OP) to fill in:
Completed on user behalf.
As you have Display Groups, it would appear to be sensible to also have Schedule Groups.
I commonly want to apply and update the same schedule to a number of layouts. Dayparts are useful as an underlying elements in this, but it still a lot of work to update the schedule details each time you make a change.
For the dev team to fill in:
The current status and the username of the:
A broad description of the changes required.
Which parts of Xibo are effected
DB Schema Changes
Any necessary DB Schema Changes