Rates Engine v0.5.0-rc.105

[v0.5.0-rc.105] — 2026-06-01

Tested against Stellar Protocol 23 (Whisk).

Pre-deploy operator note: indexer restart picks up the poller skip-doesn't-mean-stale fix.

Fixed

• ratesengine_external_poller_stale falsely firing on
  chainlink. Live-r1 incident 2026-06-01: chainlink poller
  reports ~36 min stale shortly after every indexer restart,
  even though it's polling correctly every 30s. Root cause:
  the runner's "skipped" branch (when the poller returns
  nil, nil, nil — by convention meaning "polled successfully
  but no new feed data") did NOT update
  ratesengine_external_poller_last_success_unix. Chainlink's
  Ethereum feeds update at most every 1 hour, so the vast
  majority of its 30-second polls naturally take the skip path.
  The alert read this as "the poller hasn't successfully
  reached upstream in 30+ min" — wrong: the poller IS
  reaching upstream, just finding nothing new.
  Fix: bump LastSuccessUnix on the skipped path too — the
  outcome="skipped" counter still distinguishes skip from
  success, but the timestamp tracks "last time we polled at all"
  not "last time we got an event."