style: auto-fix lint violations from enhanced ruff rules

1 files changed, 2 insertions, 3 deletions

diff --git a/services/strategy-engine/strategies/grid_strategy.py b/services/strategy-engine/strategies/grid_strategy.py
index 283bfe5..491252e 100644
--- a/services/strategy-engine/strategies/grid_strategy.py
+++ b/services/strategy-engine/strategies/grid_strategy.py
@@ -1,9 +1,8 @@
 from decimal import Decimal
-from typing import Optional
 
 import numpy as np
 
-from shared.models import Candle, Signal, OrderSide
+from shared.models import Candle, OrderSide, Signal
 from strategies.base import BaseStrategy
 
 
@@ -17,7 +16,7 @@ class GridStrategy(BaseStrategy):
         self._grid_count: int = 5
         self._quantity: Decimal = Decimal("0.01")
         self._grid_levels: list[float] = []
-        self._last_zone: Optional[int] = None
+        self._last_zone: int | None = None
         self._exit_threshold_pct: float = 5.0
         self._out_of_range: bool = False
         self._in_position: bool = False  # Track if we have any grid positions