export interface PortfolioPositionDetail { averagePrice: number; currency: string; firstBuyDate: string; grossPerformance: number; grossPerformancePercent: number; historicalData: HistoricalDataItem[]; investment: number; marketPrice: number; maxPrice: number; minPrice: number; quantity: number; symbol: string; } export interface HistoricalDataItem { averagePrice?: number; date: string; grossPerformancePercent?: number; value: number; }