Removed backtesting funding-fee code

freqtrade/exchange/ftx.py

@@ -1,7 +1,6 @@
 """ FTX exchange subclass """
 import logging
-from datetime import datetime
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List
 
 import ccxt
 
@@ -154,25 +153,3 @@ class Ftx(Exchange):
         if order['type'] == 'stop':
             return safe_value_fallback2(order, order, 'id_stop', 'id')
         return order['id']
-
-    def _get_funding_rate(self, pair: str, when: datetime) -> Optional[float]:
-        """FTX doesn't use this"""
-        return None
-
-    def _get_funding_fee(
-        self,
-        pair: str,
-        contract_size: float,
-        mark_price: float,
-        premium_index: Optional[float],
-        # index_price: float,
-        # interest_rate: float)
-    ) -> float:
-        """
-            Calculates a single funding fee
-            Always paid in USD on FTX  # TODO: How do we account for this
-            : param contract_size: The amount/quanity
-            : param mark_price: The price of the asset that the contract is based off of
-            : param funding_rate: Must be None on ftx
-        """
-        return (contract_size * mark_price) / 24