协议字段
pub user_id: String, pub currency: String, pub pre_balance: f64, pub deposit: f64, pub withdraw: f64, pub WithdrawQuota: f64, pub close_profit: f64, pub commission: f64, pub premium: f64, pub static_balance: f64, pub position_profit: f64, pub float_profit: f64, pub balance: f64, pub margin: f64, pub frozen_margin: f64, pub frozen_commission: f64, pub frozen_premium: f64, pub available: f64, pub risk_ratio: f64,