chore: log a warning that the user is in territory that might not work.

freqtrade/exchange/exchange.py

@@ -837,6 +837,11 @@ class Exchange:
             raise ConfigurationError(
                 f"Historic OHLCV data not available for {self.name}. Can't use freqAI."
             )
+        elif override and freqai_enabled and not self._ft_has["ohlcv_has_history"]:
+            logger.warning(
+                "Overriding exchange checks for freqAI. Make sure that your exchange supports "
+                "fetching historic OHLCV data, otherwise freqAI will not work."
+            )
 
     def validate_required_startup_candles(self, startup_candles: int, timeframe: str) -> int:
         """