Fix syntax error and dataframe column extraction in yfinance batch fetch

data_provider.py

@@ -212,12 +212,20 @@ class ForexDataProvider:
         else:
             period = f"{lookback_days}d"
 
+        for attempt in range(3):
             try:
                 df = yf.download(
                     yf_symbol, interval=yf_interval, period=period,
                     progress=False, auto_adjust=False, threads=False,
                 )
-            if df is None or df.empty:
+                if df is not None and not df.empty:
+                    break
+                time.sleep(1.0)
+            except Exception as e:
+                if attempt == 2:
+                    raise DataUnavailableError(f"yfinance fetch failed for {symbol} {timeframe.value}: {e}")
+                time.sleep(1.0)
+        else:
             raise DataUnavailableError(f"No data returned for {symbol}")
 
         if isinstance(df.columns, pd.MultiIndex):
@@ -242,8 +250,6 @@ class ForexDataProvider:
 
         logger.info(f"[yf live] {yf_symbol} {timeframe.value}: {len(df)} bars, last close={df['Close'].iloc[-1]:.5f}")
         return df
-        except Exception as e:
-            raise DataUnavailableError(f"yfinance fetch failed for {symbol} {timeframe.value}: {e}")
 
     def _batch_fetch_timeframe(self, symbols: List[str], timeframe: Timeframe, lookback_days: int) -> None:
         if not _YF_AVAILABLE:
@@ -270,14 +276,20 @@ class ForexDataProvider:
         else:
             period = f"{lookback_days}d"
 
+        for attempt in range(3):
             try:
                 df_multi = yf.download(
                     " ".join(yf_symbols), interval=yf_interval, period=period,
-                progress=False, auto_adjust=False, threads=True, group_by="ticker"
+                    progress=False, auto_adjust=False, threads=False, group_by="ticker"
                 )
-            
-            if df_multi is None or df_multi.empty:
-                logger.warning(f"Batch fetch empty for {timeframe.value}")
+                if df_multi is not None and not df_multi.empty:
+                    break
+                time.sleep(1.0)
+            except Exception as e:
+                logger.warning(f"Batch fetch attempt {attempt+1} failed for {timeframe.value}: {e}")
+                time.sleep(1.0)
+        else:
+            logger.warning(f"Batch fetch empty for {timeframe.value} after 3 attempts")
             return
 
         if df_multi.index.tz is None:
@@ -292,7 +304,7 @@ class ForexDataProvider:
                 if len(yf_symbols) == 1:
                     df_sym = df_multi.copy()
                     if isinstance(df_sym.columns, pd.MultiIndex):
-                            df_sym.columns = df_sym.columns.get_level_values(0)
+                        df_sym.columns = df_sym.columns.get_level_values(1)
                 else:
                     if yf_sym in df_multi.columns.get_level_values(0):
                         df_sym = df_multi[yf_sym].copy()
@@ -326,9 +338,6 @@ class ForexDataProvider:
             except Exception as e:
                 logger.warning(f"Failed to process batch data for {symbol}: {e}")
 
-        except Exception as e:
-            logger.warning(f"Batch fetch failed for {timeframe.value}: {e}")
-
     def _validate_and_clean(
         self, df: pd.DataFrame, symbol: str, timeframe: Timeframe
     ) -> pd.DataFrame: