Fix migration issue

freqtrade/exchange/exchange.py

@@ -71,6 +71,9 @@ class Exchange:
         "l2_limit_range_required": True,  # Allow Empty L2 limit (kucoin)
     }
     _ft_has: Dict = {}
+
+    # funding_fee_times is currently unused, but should ideally be used to properly
+    # schedule refresh times
     funding_fee_times: List[int] = []  # hours of the day
 
     _supported_trading_mode_collateral_pairs: List[Tuple[TradingMode, Collateral]] = [

freqtrade/persistence/migrations.py

@@ -180,7 +180,7 @@ def check_migrate(engine, decl_base, previous_tables) -> None:
     table_back_name = get_backup_name(tabs, 'trades_bak')
 
     # Check for latest column
-    if not has_column(cols, 'is_short'):
+    if not has_column(cols, 'funding_fees'):
         logger.info(f'Running database migration for trades - backup: {table_back_name}')
         migrate_trades_table(decl_base, inspector, engine, table_back_name, cols)
         # Reread columns - the above recreated the table!