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Model Groups provide logical model names that map to multiple physical models across providers, with automatic failover when one provider's key pool is exhausted. Backend: - New model_groups + model_group_members tables with FK constraints - Full CRUD API (7 endpoints) with admin-only write permissions - Cache layer: DashMap-backed CachedModelGroup with load_from_db - Relay integration: ModelResolution enum for Direct/Group routing - Cross-provider failover: sort_candidates_by_quota + OnceLock cache - Relay failure path: record failure usage + relay_dequeue (fixes queue counter leak that caused connection pool exhaustion) - add_group_member: validate model_id exists before insert Frontend: - saas-relay-client: accept getModel() callback for dynamic model selection - connectionStore: prefer conversationStore.currentModel over first available Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>