List durably settled rounds
Returns every round expiration whose settlement_round_guard row
has been committed. This is the authoritative durable source —
unlike /v1/market/settlements (which reads the settlements
table), this endpoint includes zero-position rounds where
persist_settlement committed the guard row without any settlement
rows. Used by settlement-service as the retry-suppression and
catch-up source of truth.
GET
List durably settled rounds
List durably settled rounds