(Author of both durable task framework and pg_durable/duroxide here)
Indeed Durable tasks is an exceptional project and was a unique innovation at the time.
pg_durable brings the same reliability and durablity semantics to long running operations within the database.
We have tons of interesting scenarios on the roadmap. Stay tuned! :)
Does ai.backfill() fill incomplete/dirty rows or does pg_durable have some notion of partial completion?