Add prepend option to download-data

freqtrade/commands/arguments.py

@@ -72,7 +72,8 @@ ARGS_LIST_DATA = ["exchange", "dataformat_ohlcv", "pairs", "trading_mode"]
 
 ARGS_DOWNLOAD_DATA = ["pairs", "pairs_file", "days", "new_pairs_days", "include_inactive",
                       "timerange", "download_trades", "exchange", "timeframes",
-                      "erase", "dataformat_ohlcv", "dataformat_trades", "trading_mode"]
+                      "erase", "dataformat_ohlcv", "dataformat_trades", "trading_mode",
+                      "prepend_data"]
 
 ARGS_PLOT_DATAFRAME = ["pairs", "indicators1", "indicators2", "plot_limit",
                        "db_url", "trade_source", "export", "exportfilename",

freqtrade/commands/cli_options.py

@@ -443,6 +443,11 @@ AVAILABLE_CLI_OPTIONS = {
         default=['1m', '5m'],
         nargs='+',
     ),
+    "prepend_data": Arg(
+        '--prepend',
+        help='Allow data prepending.',
+        action='store_true',
+    ),
     "erase": Arg(
         '--erase',
         help='Clean all existing data for the selected exchange/pairs/timeframes.',

freqtrade/commands/data_commands.py

@@ -85,6 +85,7 @@ def start_download_data(args: Dict[str, Any]) -> None:
                 new_pairs_days=config['new_pairs_days'],
                 erase=bool(config.get('erase')), data_format=config['dataformat_ohlcv'],
                 trading_mode=config.get('trading_mode', 'spot'),
+                prepend=config.get('prepend_data', False)
             )
 
     except KeyboardInterrupt: