added close position and trade session

lib/pt_trading/fit_method.py

@@ -1,8 +1,8 @@
 from abc import ABC, abstractmethod
 from enum import Enum
 from typing import Dict, Optional, cast
-import pandas as pd  # type: ignore[import]
 
+import pandas as pd  # type: ignore[import]
 from pt_trading.results import BacktestResult
 from pt_trading.trading_pair import TradingPair
 
@@ -22,7 +22,7 @@ class PairsTradingFitMethod(ABC):
 
     @abstractmethod
     def run_pair(
-        self, config: Dict, pair: TradingPair, bt_result: BacktestResult
+        self, pair: TradingPair, bt_result: BacktestResult
     ) -> Optional[pd.DataFrame]: ...
 
     @abstractmethod
@@ -33,3 +33,4 @@ class PairState(Enum):
     INITIAL = 1
     OPEN = 2
     CLOSED = 3
+    CLOSED_POSITIONS = 4