expose buy_tag to api

freqtrade/rpc/api_server/api_schemas.py

@@ -151,6 +151,7 @@ class TradeSchema(BaseModel):
     amount_requested: float
     stake_amount: float
     strategy: str
+    buy_tag: Optional[str]
     timeframe: int
     fee_open: Optional[float]
     fee_open_cost: Optional[float]

tests/rpc/test_rpc_apiserver.py

@@ -875,6 +875,7 @@ def test_api_status(botclient, mocker, ticker, fee, markets):
         'sell_reason': None,
         'sell_order_status': None,
         'strategy': 'DefaultStrategy',
+        'buy_tag': None,
         'timeframe': 5,
         'exchange': 'binance',
     }
@@ -1029,6 +1030,7 @@ def test_api_forcebuy(botclient, mocker, fee):
         'sell_reason': None,
         'sell_order_status': None,
         'strategy': 'DefaultStrategy',
+        'buy_tag': None,
         'timeframe': 5,
         'exchange': 'binance',
         }