>”If we replace the second condition with just 'Follows the new account' then it might work. But I can't promise to deliver this soon “

The historical data “for all users” is gonna be the most challenging. After this, Getting data for new users will be easier. 

- “First follow of new account” can be “assumed” to be first in contact list. 

- “Follows new account within 24 hours” can be changed to “follows new account”

- “is author or recipient of first note or DM with new account” will be challenging when NIP-44/17 gift wrapped private messages takes main stage…. But that’s a tomorrow problem?