Afaik no one has claimed or completed this work for Damus. nostr:npub1r0rs5q2gk0e3dk3nlc7gnu378ec6cnlenqp8a3cjhyzu6f8k5sgs4sq9ac can update you on the bounty.

Good question on sync between clients. Here is a hint from nostr:npub1r0rs5q2gk0e3dk3nlc7gnu378ec6cnlenqp8a3cjhyzu6f8k5sgs4sq9ac

nostr:note1wn8pw9czgvnmk7h9nz0n7wtxzytgru9ja8m7sf0gaa8lgssg5kysyus24t