fix issue

freqtrade/templates/freqaiprimer.py

@@ -1095,7 +1095,12 @@ class FreqaiPrimer(IStrategy):
                 hist_df = dataframe.iloc[:i+1] if i != -1 else dataframe
                 if len(hist_df) > 0:
                     # 使用新的 get_trend_score_with_cache 方法替代直接调用 get_market_trend
-                    timestamp = int(hist_df.index[-1].timestamp())  # 获取时间戳
+                    # 确保索引是 datetime 类型
+                    if not isinstance(hist_df.index, pd.DatetimeIndex):
+                        hist_df.index = pd.to_datetime(hist_df.index)
+                    
+                    # 获取时间戳
+                    timestamp = int(hist_df.index[-1].timestamp())
                     score = self.get_trend_score_with_cache(pair=pair, timeframe=self.timeframe, timestamp=timestamp, dataframe=hist_df, metadata=metadata)
                     trend_scores_20.append(score)
                 else: