Deleted Requests deleted by User:null

Hello,

This is in regards to version 9018

One of our technicians was trying to find an old request (119403), but was unable to retrieve the request since it was deleted. Checked the system log and it shows that it was deleted by the system and not an individual.

System Log Message : User:null trying to Delete the following request(s): ReqID:119403

Module : Request

Sub Module : -

Type : Info

Action : Delete

Occurred At : Feb 5, 2015 12:23 PM

Probable Cause : -

Performed By : SYSTEM

This action is performed every day at 12:23 PM, could someone explain what this message is and why it's performing this every day?