fix: 修复api接口访问问题

app/api/data.py

@@ -52,10 +52,18 @@ def batch_fetch(req: BatchFetchRequest, db: Session = Depends(get_db)):
             cached = get_cached_data(db, sym, data_type, periods)
             timeframes = []
             for p, candles in cached["timeframes"].items():
+                # 转换数据格式: time -> datetime
+                normalized_candles = []
+                for c in candles:
+                    candle_dict = dict(c)
+                    if 'time' in candle_dict and 'datetime' not in candle_dict:
+                        candle_dict['datetime'] = candle_dict.pop('time')
+                    normalized_candles.append(candle_dict)
+                
                 timeframes.append(TimeframeData(
                     period=p,
-                    candles=[CandleItem(**c) for c in candles],
-                    candle_count=len(candles),
+                    candles=[CandleItem(**c) for c in normalized_candles],
+                    candle_count=len(normalized_candles),
                     fetched_at=cached.get("timestamp", ""),
                 ))
             details[sym] = SymbolDataResponse(
@@ -88,10 +96,18 @@ def batch_fetch(req: BatchFetchRequest, db: Session = Depends(get_db)):
             for p in periods:
                 candles = all_timeframes.get(p, [])
                 if candles:
+                    # 转换数据格式: time -> datetime
+                    normalized_candles = []
+                    for c in candles:
+                        candle_dict = dict(c)
+                        if 'time' in candle_dict and 'datetime' not in candle_dict:
+                            candle_dict['datetime'] = candle_dict.pop('time')
+                        normalized_candles.append(candle_dict)
+                    
                     timeframes.append(TimeframeData(
                         period=p,
-                        candles=[CandleItem(**c) for c in candles],
-                        candle_count=len(candles),
+                        candles=[CandleItem(**c) for c in normalized_candles],
+                        candle_count=len(normalized_candles),
                         fetched_at=result.get("timestamp", ""),
                     ))