refactor: improve variable naming

Author: xmatthias

freqtrade/persistence/trade_model.py

@@ -1062,13 +1062,13 @@ def calculate_interest(self) -> FtPrecise:
         return interest(exchange_name=self.exchange, borrowed=borrowed, rate=rate, hours=hours)
 
     def _calc_base_close(self, amount: FtPrecise, rate: float, fee: float | None) -> FtPrecise:
-        close_trade = amount * FtPrecise(rate)
-        fees = close_trade * FtPrecise(fee or 0.0)
+        close_value = amount * FtPrecise(rate)
+        fees = close_value * FtPrecise(fee or 0.0)
 
         if self.is_short:
-            return close_trade + fees
+            return close_value + fees
         else:
-            return close_trade - fees
+            return close_value - fees
 
     def calc_close_trade_value(self, rate: float, amount: float | None = None) -> float:
         """