Improve tests for backtest protections

freqtrade/plugins/__init__.py

@@ -1,2 +0,0 @@
-# flake8: noqa: F401
-# from freqtrade.plugins.protectionmanager import ProtectionManager

freqtrade/plugins/protections/stoploss_guard.py

@@ -3,8 +3,6 @@ import logging
 from datetime import datetime, timedelta
 from typing import Any, Dict
 
-from sqlalchemy import and_, or_
-
 from freqtrade.persistence import Trade
 from freqtrade.plugins.protections import IProtection, ProtectionReturn
 from freqtrade.strategy.interface import SellType