UML activity diagram modeling an AI-driven gold price recommendation engine that ingests real-time and historical market data. The system retrieves gold price data from external sources, validates completeness, and feeds clean datasets into a prediction module that forecasts future prices. If live predictions fail, the engine gracefully falls back to historical-data-only analysis before generating Buy/Sell/Hold recommendations. This workflow demonstrates best practices for resilient ML pipelines: error handling, data validation gates, and fallback logic that ensures users always receive actionable insights. Fork this diagram on Diagrams.so to customize data sources, add risk scoring, or integrate with your trading platform. The retry loop and partial-data warning path exemplify production-grade safeguards that prevent stale or incomplete recommendations from reaching end users.