bfr w buy_ratios and std, algo with symbol switching and fr exponentiation for optimization

modules/structs.py

@@ -261,6 +261,8 @@ class Perpetual_Exchange:
     notional_obj: dict = field(default_factory=dict)
     notional_position: float = 0
     unrealized_pnl: float = 0
+    buy_ratio_std: float = 0
+    just_rejected_count: int = 0
 
     # async def update(self):
     #     await self.Collateral_Updates.update()