Contract for backtest progress events.
Emitted during Backtest.background() execution to track progress. Contains information about total frames, processed frames, and completion percentage.
exchangeName: string
exchangeName - Name of the exchange used in execution
strategyName: string
strategyName - Name of the strategy being executed
symbol: string
symbol - Trading symbol (e.g., "BTCUSDT")
totalFrames: number
totalFrames - Total number of frames to process
processedFrames: number
processedFrames - Number of frames processed so far
progress: number
progress - Completion percentage from 0.0 to 1.0