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fdbaae4734
No-auth / keyless providers (opencode, opencode-zen) returned synthetic "noauth" credentials BEFORE honoring excludeConnectionIds, so the chat account-fallback loop re-selected the same synthetic connection forever on a persistent upstream error (e.g. the opencode public endpoint answering 401 "Model X is not supported"). The synthetic id has no DB row, so markAccountUnavailable could not persist a cooldown to brake it — each iteration wrote key-health + request logs immediately, growing the DB until the disk filled (see @paraflu's "failure #320" trace in discussion #3038). Honor the exclusion set in both synthetic-credential paths (getProviderCredentials NOAUTH_PROVIDERS block + opencode-zen keyless fallback): once "noauth" is already excluded, return null so the handler stops after a single attempt. The happy path (nothing excluded -> synthetic noauth) is preserved, so keyless access still works. Closes #3061. Tests (TDD): tests/unit/auth-noauth-fallback-loop-3061.test.ts — the two exclusion cases failed before the fix and pass after; two happy-path guards ensure first-selection synthetic noauth still resolves.