Add backtesting support for order.stake_amount

tests/optimize/test_backtesting.py

@@ -603,6 +603,7 @@ def test_backtest__enter_trade_futures(default_conf_usdt, fee, mocker) -> None:
     assert pytest.approx(trade.liquidation_price) == 0.11787191
     assert pytest.approx(trade.orders[0].cost) == (
         trade.stake_amount * trade.leverage + trade.fee_open)
+    assert pytest.approx(trade.orders[-1].stake_amount) == trade.stake_amount
 
     # Stake-amount too high!
     mocker.patch(f"{EXMS}.get_min_pair_stake_amount", return_value=600.0)

tests/persistence/test_persistence.py

@@ -563,14 +563,14 @@ def test_calc_open_close_trade_price(
     trade.open_order_id = f'something-{is_short}-{lev}-{exchange}'
 
     oobj = Order.parse_from_ccxt_object(entry_order, 'ADA/USDT', trade.entry_side)
-    oobj.trade = trade
+    oobj._trade_live = trade
     oobj.update_from_ccxt_object(entry_order)
     trade.update_trade(oobj)
 
     trade.funding_fees = funding_fees
 
     oobj = Order.parse_from_ccxt_object(exit_order, 'ADA/USDT', trade.exit_side)
-    oobj.trade = trade
+    oobj._trade_live = trade
     oobj.update_from_ccxt_object(exit_order)
     trade.update_trade(oobj)