Module cache 

Data cache for prefetched historical and live streaming data

This module provides a caching layer that:

• Prefetches historical data asynchronously before execution
• Maintains a live data buffer updated by background tasks
• Provides synchronous access methods for the execution hot path

Structs

CacheKey

Cache key for data lookups

CachedData

Cached data for a symbol/timeframe combination

DataCache

Data cache with prefetched historical and live data buffers