Hi Michael, thanks for reaching out. You can learn about what workflows you can build with this signal here. As for your questions on the setup of this feature:
* If you only provide a Person LinkedIn Url column, we will track that list of people for any future job changes from the moment you create the Signal
* IF you provide a Company LinkedIn Url (optional) column, we will do an initial historical check against the companies you provided. So e.g. if you say that Person X was at Company A, we will do a historical check to see if they're still in Company A, and if not, we will produce a Job Change event, regardless of when they started their current job. The use case for this is if customers want to check if their current data (e.g. from their CRM) is still up to date.
I hope this was helpful. If there's anything else I can assist you with, please let me know!