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26f7b36ce4
Settings: - Add `alwaysPreserveClientCache` setting with modes: auto/always/never - UI toggle in Dashboard > Settings > Routing tab - Auto mode preserves cache_control for Claude Code clients with deterministic routing Metrics: - Track prompt cache token usage (input, cached, creation) - Display cache reuse ratio (cached/input tokens) - Breakdown by provider and routing strategy - Shows tokens saved and estimated cost savings API Endpoints: - GET /api/settings/cache-metrics - retrieve metrics - DELETE /api/settings/cache-metrics - reset metrics Files: - open-sse/utils/cacheControlPolicy.ts: CacheControlMetrics interface, trackCacheMetrics, updateCacheTokenMetrics - open-sse/handlers/chatCore.ts: Track cache tokens from provider responses - src/lib/db/settings.ts: Database functions for metrics persistence - src/lib/cacheControlSettings.ts: Cached settings accessor - src/app/(dashboard)/dashboard/settings/components/CacheStatsCard.tsx: Metrics dashboard UI - tests/unit/*.test.mjs: Unit tests (41 tests pass) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>