How to Set Schedular to delete data base?

[ashish.pundir]

Hello bubblers,
I am doing something in which there is a time slot related to user. there is TimeSlot db which is connected to user. So now i want that to delete timeslot when the current date and time have passed.
Let there is a time slot of any time and when at night it is 23:59 the schedular run and delete time slot of all user which is not reserved before that day or that particular date.
So guys if you have any idea how to do it, please share .
Thanks

[ashish.pundir]

I mean not 23:59, we can choose any time. Here is DB (timeSlot ) in which there is starttime which is i have to consider like that if sarttime is passed then delete that particular timeSlot. So i think we have to use backend here. Now i am not able to to that which workflow action i have to choose and how to set condition like if starttime passed then delete that DB. And starttime db is connected to user also. Here is screenshot.If need any other information please tell me.

and how this recursive workflow will run.