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Author	SHA1	Message	Date
Stephanie Gredell	c7e0307f08	feat: Complete simulation engine with 10 components and level validation ... COMPLETE SIMULATION SYSTEM IMPLEMENTATION ## New Simulation Components (7 added): - Database: Read/write latency, replication overhead, RPS capacity - Cache: In-memory caching with LRU/LFU/FIFO/Random eviction policies - Message Queue: FIFO processing, retention, backpressure, processing rate - Microservice: Auto-scaling, resource capacity, load balancing across instances - Monitoring/Alerting: Multi-metric alerting (latency, errors, queue size) - Third Party Service: External API reliability, rate limiting, failure modeling - Data Pipeline: Batch processing with 10 transformation types ## Enhanced Existing Components: - Web Server: Fixed property naming (rpsCapacity) - CDN: Fixed property naming (ttl) - Load Balancer: Maintained existing functionality - Engine: Added smart topology-based entry point detection ## Level Validation System: - Complete pass/fail game mechanics with scoring (0-100) - Performance validation: throughput, latency, availability, cost - Component validation: mustInclude, mustNotInclude, minReplicas - Detailed feedback with specific requirement failures - Smart scoring with performance bonuses ## Frontend Integration: - Real simulation execution (replaced mock data) - Level information extraction from URL paths - Rich results display with pass/fail feedback - Automatic entry node detection from design topology ## Infrastructure Updates: - Design Schema: Added missing properties, fixed coordinate precision (float64) - Authentication: GitHub OAuth protection for all game routes - Error Handling: Comprehensive validation and user feedback - Testing: 78 tests covering all components and integration scenarios ## Technical Achievements: - 100% simulation component coverage (10/10 components) - Realistic performance modeling for all component types - Discrete-event simulation with proper state management - Production-ready code without emojis - Comprehensive test suite with integration testing ## Breaking Changes: - Position coordinates now use float64 for precision - /simulate endpoint now requires authentication - Request/response format updated for level validation This completes the core simulation engine implementation and enables a complete educational game experience for learning system design.	5 months ago