Interface Position

interface Position {
    symbol: string;
    quantity: number;
    avg_cost: number;
    current_price: number;
    market_value: number;
    cost_basis: number;
    unrealized_pnl: number;
    unrealized_pnl_pct: number;
    position_size_pct: number;
    stop_loss?: number | null;
    take_profit?: number | null;
    sector?: string | null;
    strategy_type?: StrategyType | null;
    entry_date?: string | null;
    holding_days?: number | null;
    snapshot_time?: string;
}