Implement startup-period to default-strategy

freqtrade/strategy/default_strategy.py

@@ -39,6 +39,9 @@ class DefaultStrategy(IStrategy):
         'stoploss_on_exchange': False
     }
 
+    # Count of candles the strategy requires before producing valid signals
+    startup_candle_count: int = 20
+
     # Optional time in force for orders
     order_time_in_force = {
         'buy': 'gtc',
@@ -105,9 +108,6 @@ class DefaultStrategy(IStrategy):
         # EMA - Exponential Moving Average
         dataframe['ema10'] = ta.EMA(dataframe, timeperiod=10)
 
-        # SMA - Simple Moving Average
-        dataframe['sma'] = ta.SMA(dataframe, timeperiod=40)
-
         return dataframe
 
     def populate_buy_trend(self, dataframe: DataFrame, metadata: dict) -> DataFrame: