v4.0.6: 过滤条件更新，希望减少被逆向选择的次数。

strategy/src/predictor.rs

@@ -346,13 +346,13 @@ impl Predictor {
             self.optimal_bid_price = self.fair_price - self.fair_price * self.params.close;
             self.optimal_ask_price = Self::DONT_VIEW;
         } else {
-            if self.signal > Decimal::ZERO {
+            if self.fair_price > self.mid_price {
                 self.bid_delta = dec!(0);
                 self.ask_delta = dec!(-2);
 
                 self.optimal_bid_price = self.fair_price - self.fair_price * (self.params.open - self.signal);
                 self.optimal_ask_price = Self::DONT_VIEW;
-            } else if self.signal < Decimal::ZERO {
+            } else if self.fair_price < self.mid_price {
                 self.ask_delta = dec!(0);
                 self.bid_delta = dec!(-2);