- Add MarketDataService for database-backed market data caching
- Integrate cache lookup/write into route_to_vendor function
- Support configurable TTL per data type (stock data: 1h, fundamentals: 24h+)
- Make caching opt-in via database_enabled and db_cache_enabled config flags
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Co-Authored-By: Claude <noreply@anthropic.com>
Joseph O'Brien