Address PR comment

config.json.example

@@ -36,7 +36,7 @@
     "experimental": {
         "use_sell_signal": false,
         "sell_profit_only": false,
-        "sell_fullfilled_at_roi": false
+        "ignore_roi_if_buy_signal": false
     },
     "telegram": {
         "enabled": true,

freqtrade/persistence.py

@@ -80,7 +80,7 @@ def check_migrate(engine) -> None:
     tabs = inspector.get_table_names()
     table_back_name = 'trades_bak'
     i = 0
-    while table_back_name in tabs:
+    for i, table_back_name in enumerate(tabs):
         i += 1
         table_back_name = f'trades_bak{i}'
         logger.info(f'trying {table_back_name}')