feat: initialize trade objects with 0 amount

This way, it'll represent the owned amount
which will be updated once the order fills

freqtrade/freqtradebot.py

@@ -987,7 +987,7 @@ class FreqtradeBot(LoggingMixin):
                 base_currency=base_currency,
                 stake_currency=self.config["stake_currency"],
                 stake_amount=stake_amount,
-                amount=amount,
+                amount=0,
                 is_open=True,
                 amount_requested=amount_requested,
                 fee_open=fee,

freqtrade/optimize/backtesting.py

@@ -1099,7 +1099,7 @@ class Backtesting:
                     open_rate_requested=propose_rate,
                     open_date=current_time,
                     stake_amount=stake_amount,
-                    amount=amount,
+                    amount=0,
                     amount_requested=amount,
                     fee_open=self.fee,
                     fee_close=self.fee,