Set sell_reason to stoploss when closing the trade as stoploss

closes #5101

freqtrade/persistence/models.py

@@ -14,6 +14,7 @@ from sqlalchemy.pool import StaticPool
 from sqlalchemy.sql.schema import UniqueConstraint
 
 from freqtrade.constants import DATETIME_PRINT_FORMAT
+from freqtrade.enums import SellType
 from freqtrade.exceptions import DependencyException, OperationalException
 from freqtrade.misc import safe_value_fallback
 from freqtrade.persistence.migrations import check_migrate
@@ -430,6 +431,7 @@ class LocalTrade():
         elif order_type in ('stop_loss_limit', 'stop-loss', 'stop-loss-limit', 'stop'):
             self.stoploss_order_id = None
             self.close_rate_requested = self.stop_loss
+            self.sell_reason = SellType.STOPLOSS_ON_EXCHANGE.value
             if self.is_open:
                 logger.info(f'{order_type.upper()} is hit for {self}.')
             self.close(safe_value_fallback(order, 'average', 'price'))