Call ROUTINE in business service

Create a Business Service that use Ens.InboundAdapter and in the OnProcessInput() method call your routine, something like:

Class Community.bs.ServiceTest Extends Ens.BusinessService
{

Parameter ADAPTER = "Ens.InboundAdapter";

Method OnProcessInput(pInput As %RegisteredObject, Output pOutput As %RegisteredObject) As %Status
{
	Set result=$$getTicket^production.etl.getTicket()
	Quit $$$OK
}

}

When you add the Business Service to the production set the setting CallInterval to a VERY LARGE interval (like 99999999), this ensure that the BS is called once.
In the BS settings add a schedule that starts the BS every day at 12 and stops at 13:00 (any time you are sure your call has finished), like: START:*-*-*T12:00:00,STOP:*-*-*T13:00:00

Note that no trace will be visible because the BS does not create any message, you may add some entry in the event log to track execution, something like $$$LOGINFO("Running getTicket") and possibly other info/error handling etc. (depends on your code).