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Improvements: - Add /api/test/shadow-run-direct endpoint for synchronous execution * Eliminates 7+ minute Hangfire queue wait * Returns in 2-3 seconds for typical windows * Persists results to DB via Outbox/Inbox pattern - Isolate external API calls (stub data in tests) * StubKrxData prevents unnecessary API calls * Unit tests run without I/O * Integration tests use real orchestration - Register ShadowRunJob in DI container * Enables endpoint direct invocation * Program.cs: AddScoped<ShadowRunJob>() - Add unit tests (3/3 passing, 326ms) * DataBackfiller_GeneratesOhlcvBars * ReplayEngine_HandlesZeroOrders * DataBackfiller_ValidatesCompleteness - Add database verification guide * docs/VERIFY_DIRECT_INVOCATION.md * SQL query examples for result validation Performance Characteristics: - 252-day window: 8.6s (full year analysis) - 90-day window: 2.3s (quarterly) - 30-day window: 1.6s (monthly, insufficient for metrics) Architecture: - API → ShadowRunJob.ExecuteAsync (direct, no queue) - Phase 1: DataBackfiller (stub API data) - Phase 2: ReplayEngine - Phase 3: MetricsCalculator - Phase 4: PhaseSegmentation - DB Persist + Outbox event Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>