OK, I need to clarify the situation I’m trying to figure out with a example:

Full backup of primary is done each night, during which Log Shipping occurs on its 15 min schedule to the secondary’s.

10 AM the next day users slam the primary database somehow. Secondary’s duplicate the same error 15 min’s later.

11 AM they realize their error and they want me to restore the previous night’s backup, to the primary, and apply transaction logs up till 9 AM before they messed up.

So my question really is; can Log Shipping transaction backups be used to accomplish this? Would I need to change the LS Transaction backup schedule to stop while the full backup is in progress, so there is a clear starting point?