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Marc-André Bombeck
fbd45f3044
Promote the volatile per-worker last-working cache to a Postgres provider-health ledger so the fallback chain shares one health signal across every instance, modelled on the atomic-upsert rate limiter. The ledger holds a durable negative cache: an auth-class failure (401/403) benches that provider for a cooldown instead of re-burning the dead round-trip on every generation; a sustained hard failure backs off briefly. The local model is never benched — it stays the guaranteed floor of the chain. Every ledger interaction fails open, so a DB error falls back to today's chain walk exactly. When the user's primary provider fails auth-class, the Coach emits a distinct credential_expired frame that deep-links to reconnect rather than a generic "try again later". Adds the provider_health table (migration 0112) and the errorCredentialExpired copy across all locales.