Extract trades df type conversion

freqtrade/data/converter.py

@@ -226,16 +226,29 @@ def trades_dict_to_list(trades: List[Dict]) -> TradeList:
     return [[t[col] for col in DEFAULT_TRADES_COLUMNS] for t in trades]
 
 
-def trades_list_to_df(trades: TradeList):
+def trades_convert_types(trades: DataFrame) -> DataFrame:
+    """
+    Convert Trades dtypes and add 'date' column
+    """
+    trades = trades.astype(TRADES_DTYPES)
+    trades['date'] = to_datetime(trades['timestamp'], unit='ms', utc=True)
+    return trades
+
+
+def trades_list_to_df(trades: TradeList, convert: bool = True):
     """
     convert trades list to dataframe
     :param trades: List of Lists with constants.DEFAULT_TRADES_COLUMNS as columns
     """
     if not trades:
-        return DataFrame(columns=DEFAULT_TRADES_COLUMNS).astype(TRADES_DTYPES)
+        df = DataFrame(columns=DEFAULT_TRADES_COLUMNS)
-    df = DataFrame(trades, columns=DEFAULT_TRADES_COLUMNS)
+    else:
+        df = DataFrame(trades, columns=DEFAULT_TRADES_COLUMNS)
 
-    return df.astype(TRADES_DTYPES)
+    if convert:
+        df = trades_convert_types(df)
+
+    return df
 
 
 def trades_to_ohlcv(trades: DataFrame, timeframe: str) -> DataFrame:

freqtrade/data/history/idatahandler.py

@@ -16,8 +16,8 @@ from pandas import DataFrame, to_datetime
 from freqtrade import misc
 from freqtrade.configuration import TimeRange
 from freqtrade.constants import TRADES_DTYPES, ListPairsWithTimeframes, TradeList
-from freqtrade.data.converter import (clean_ohlcv_dataframe, trades_df_remove_duplicates,
+from freqtrade.data.converter import (clean_ohlcv_dataframe, trades_convert_types,
-                                      trim_dataframe)
+                                      trades_df_remove_duplicates, trim_dataframe)
 from freqtrade.enums import CandleType, TradingMode
 from freqtrade.exchange import timeframe_to_seconds
 
@@ -218,8 +218,8 @@ class IDataHandler(ABC):
         :return: List of trades
         """
         trades = trades_df_remove_duplicates(self._trades_load(pair, timerange=timerange))
-        trades = trades.astype(TRADES_DTYPES)
+
-        trades['date'] = to_datetime(trades['timestamp'], unit='ms', utc=True)
+        trades = trades_convert_types(trades)
         return trades
 
     def trades_load_aslist(self, pair: str, timerange: Optional[TimeRange] = None) -> TradeList:

freqtrade/data/history/jsondatahandler.py

@@ -134,7 +134,7 @@ class JsonDataHandler(IDataHandler):
             logger.info("Old trades format detected - converting")
             tradesdata = trades_dict_to_list(tradesdata)
             pass
-        return trades_list_to_df(tradesdata)
+        return trades_list_to_df(tradesdata, convert=False)
 
     @classmethod
     def _get_file_extension(cls):