style: auto-fix lint violations from enhanced ruff rules

1 files changed, 2 insertions, 3 deletions

diff --git a/services/strategy-engine/strategies/base.py b/services/strategy-engine/strategies/base.py
index d5be675..1d9d289 100644
--- a/services/strategy-engine/strategies/base.py
+++ b/services/strategy-engine/strategies/base.py
@@ -1,7 +1,6 @@
 from abc import ABC, abstractmethod
 from collections import deque
 from decimal import Decimal
-from typing import Optional
 
 import pandas as pd
 
@@ -102,7 +101,7 @@ class BaseStrategy(ABC):
 
     def _calculate_atr_stops(
         self, entry_price: Decimal, side: str
-    ) -> tuple[Optional[Decimal], Optional[Decimal]]:
+    ) -> tuple[Decimal | None, Decimal | None]:
         """Calculate ATR-based stop-loss and take-profit.
 
         Returns (stop_loss, take_profit) as Decimal or (None, None) if not enough data.
@@ -131,7 +130,7 @@ class BaseStrategy(ABC):
 
         return sl, tp
 
-    def _apply_filters(self, signal: Signal) -> Optional[Signal]:
+    def _apply_filters(self, signal: Signal) -> Signal | None:
         """Apply all filters to a signal. Returns signal with SL/TP or None if filtered out."""
         if signal is None:
             return None