Differentiate routing rules based on upload date
We have leads that come in from joint partner events. When we upload, we want to keep those already in our system with the Inside Sales team members who own them. If they are NEW to the system, we need some sort of flag created that allows us to use a different routing system. Since we do not 1:1 sync with SFDC, sometimes there are people in our database with no lead owner, and even though they came in before the joint event, we can't use owner as the basis for determining IF we should route to partners.
I'm looking for a solution to help me flag those joint partner leads only when they are new to the system. Any recommendations?