Add missing fields to json (and json parse)

tests/persistence/test_persistence.py

@@ -1385,6 +1385,7 @@ def test_to_json(fee):
         precision_mode=1,
         amount_precision=8.0,
         price_precision=7.0,
+        contract_size=1,
     )
     result = trade.to_json()
     assert isinstance(result, dict)
@@ -1450,6 +1451,7 @@ def test_to_json(fee):
         'amount_precision': 8.0,
         'price_precision': 7.0,
         'precision_mode': 1,
+        'contract_size': 1,
         'orders': [],
         'has_open_orders': False,
     }
@@ -1471,6 +1473,7 @@ def test_to_json(fee):
         precision_mode=2,
         amount_precision=7.0,
         price_precision=8.0,
+        contract_size=1
     )
     result = trade.to_json()
     assert isinstance(result, dict)
@@ -1536,6 +1539,7 @@ def test_to_json(fee):
         'amount_precision': 7.0,
         'price_precision': 8.0,
         'precision_mode': 2,
+        'contract_size': 1,
         'orders': [],
         'has_open_orders': False,
     }

tests/persistence/test_trade_fromjson.py

@@ -66,6 +66,10 @@ def test_trade_fromjson():
         "is_short": false,
         "trading_mode": "spot",
         "funding_fees": 0.0,
+        "amount_precision": 1.0,
+        "price_precision": 3.0,
+        "precision_mode": 2,
+        "contract_size": 1.0,
         "open_order_id": null,
         "orders": [
             {
@@ -180,6 +184,9 @@ def test_trade_fromjson():
     assert isinstance(trade.open_date, datetime)
     assert trade.exit_reason == 'no longer good'
     assert trade.realized_profit == 2.76315361
+    assert trade.precision_mode == 2
+    assert trade.amount_precision == 1.0
+    assert trade.contract_size == 1.0
 
     assert len(trade.orders) == 5
     last_o = trade.orders[-1]

tests/rpc/test_rpc.py

@@ -90,6 +90,7 @@ def test_rpc_trade_status(default_conf, ticker, fee, mocker) -> None:
         'amount_precision': 8.0,
         'price_precision': 8.0,
         'precision_mode': 2,
+        'contract_size': 1,
         'has_open_orders': False,
         'orders': [{
             'amount': 91.07468123, 'average': 1.098e-05, 'safe_price': 1.098e-05,