Don't export "hum" date versions for trade objects.

They are not used and have a rather high performance penalty due to
using arrow.get

freqtrade/persistence/models.py

@@ -294,15 +294,12 @@ class LocalTrade():
             'fee_close_cost': self.fee_close_cost,
             'fee_close_currency': self.fee_close_currency,
 
-            'open_date_hum': arrow.get(self.open_date).humanize(),
             'open_date': self.open_date.strftime(DATETIME_PRINT_FORMAT),
             'open_timestamp': int(self.open_date.replace(tzinfo=timezone.utc).timestamp() * 1000),
             'open_rate': self.open_rate,
             'open_rate_requested': self.open_rate_requested,
             'open_trade_value': round(self.open_trade_value, 8),
 
-            'close_date_hum': (arrow.get(self.close_date).humanize()
-                               if self.close_date else None),
             'close_date': (self.close_date.strftime(DATETIME_PRINT_FORMAT)
                            if self.close_date else None),
             'close_timestamp': int(self.close_date.replace(

freqtrade/rpc/api_server/api_schemas.py

@@ -151,13 +151,11 @@ class TradeSchema(BaseModel):
     fee_close: Optional[float]
     fee_close_cost: Optional[float]
     fee_close_currency: Optional[str]
-    open_date_hum: str
     open_date: str
     open_timestamp: int
     open_rate: float
     open_rate_requested: Optional[float]
     open_trade_value: float
-    close_date_hum: Optional[str]
     close_date: Optional[str]
     close_timestamp: Optional[int]
     close_rate: Optional[float]

freqtrade/rpc/telegram.py

@@ -294,6 +294,7 @@ class Telegram(RPCHandler):
 
             messages = []
             for r in results:
+                r['open_date_hum'] = arrow.get(r['open_date']).humanize()
                 lines = [
                     "*Trade ID:* `{trade_id}` `(since {open_date_hum})`",
                     "*Current Pair:* {pair}",