v4.0.7: 使用最小二乘法拟合fair price

strategy/src/predictor.rs

@@ -201,7 +201,7 @@ impl Predictor {
 
                 // 拟合，60s拟合一次
                 let before_fitting = Utc::now().timestamp_millis();
-                if Decimal::from(before_fitting) - self.prev_fitting_time > dec!(60_000) {
+                if Decimal::from(before_fitting) - self.prev_fitting_time > dec!(60_000) || self.prices[mid_index][0].len() < 1000 {
                     if let Some((k, b)) = self.linear_least_squares(mid_index).await {
                         self.ks[mid_index] = k;
                         self.bs[mid_index] = b;