remove .query from most tests

tests/rpc/test_rpc_apiserver.py

@@ -14,6 +14,7 @@ from fastapi import FastAPI, WebSocketDisconnect
 from fastapi.exceptions import HTTPException
 from fastapi.testclient import TestClient
 from requests.auth import _basic_auth_str
+from sqlalchemy import select
 
 from freqtrade.__init__ import __version__
 from freqtrade.enums import CandleType, RunMode, State, TradingMode
@@ -624,7 +625,7 @@ def test_api_trades(botclient, mocker, fee, markets, is_short):
     assert rc.json()['offset'] == 0
 
     create_mock_trades(fee, is_short=is_short)
-    Trade.query.session.flush()
+    Trade.session.flush()
 
     rc = client_get(client, f"{BASE_URI}/trades")
     assert_response(rc)
@@ -677,7 +678,7 @@ def test_api_delete_trade(botclient, mocker, fee, markets, is_short):
     create_mock_trades(fee, is_short=is_short)
 
     ftbot.strategy.order_types['stoploss_on_exchange'] = True
-    trades = Trade.query.all()
+    trades = Trade.session.scalars(select(Trade)).all()
     trades[1].stoploss_order_id = '1234'
     Trade.commit()
     assert len(trades) > 2
@@ -685,7 +686,7 @@ def test_api_delete_trade(botclient, mocker, fee, markets, is_short):
     rc = client_delete(client, f"{BASE_URI}/trades/1")
     assert_response(rc)
     assert rc.json()['result_msg'] == 'Deleted trade 1. Closed 1 open orders.'
-    assert len(trades) - 1 == len(Trade.query.all())
+    assert len(trades) - 1 == len(Trade.session.scalars(select(Trade)).all())
     assert cancel_mock.call_count == 1
 
     cancel_mock.reset_mock()
@@ -694,11 +695,11 @@ def test_api_delete_trade(botclient, mocker, fee, markets, is_short):
     assert_response(rc, 502)
     assert cancel_mock.call_count == 0
 
-    assert len(trades) - 1 == len(Trade.query.all())
+    assert len(trades) - 1 == len(Trade.session.scalars(select(Trade)).all())
     rc = client_delete(client, f"{BASE_URI}/trades/2")
     assert_response(rc)
     assert rc.json()['result_msg'] == 'Deleted trade 2. Closed 2 open orders.'
-    assert len(trades) - 2 == len(Trade.query.all())
+    assert len(trades) - 2 == len(Trade.session.scalars(select(Trade)).all())
     assert stoploss_mock.call_count == 1
 
     rc = client_delete(client, f"{BASE_URI}/trades/502")