I would appreciate this as well, as a work-around I can exclude by linkedin_username but the ID is a bit easier if you have it.

This would be ideal. I can picture two ways of doing this: one would be to provide a list of PDL IDs to a query so that they do not come back. The other would be for PDL to store ids that we have retrieved earlier and let us specify a date that they should only be returned if they updated since X.

Upvoting this feature request - right now we get the same profiles across queries. This means we get billed for useless information. We should be able to explicitly exclude profile ids from queries so we don't get duplicative info / double charged