Fix runtime logging and frontend app regressions

backend/services/market.py

@@ -10,7 +10,7 @@ from typing import Any, Callable, Dict, List, Optional
 from zoneinfo import ZoneInfo
 
 import pandas_market_calendars as mcal
-from backend.config.data_config import get_data_source
+from backend.config.data_config import get_data_sources
 from backend.data.provider_utils import normalize_symbol
 
 logger = logging.getLogger(__name__)
@@ -142,9 +142,7 @@ class MarketService:
     def _start_real_mode(self):
         from backend.data.polling_price_manager import PollingPriceManager
 
-        provider = get_data_source()
-        if provider == "local_csv":
-            provider = "yfinance"
+        provider = self._resolve_live_quote_provider()
 
         if provider == "finnhub" and not self.api_key:
             raise ValueError("API key required for live mode")
@@ -157,6 +155,13 @@ class MarketService:
         self._price_manager.subscribe(self.tickers)
         self._price_manager.start()
 
+    def _resolve_live_quote_provider(self) -> str:
+        """Pick the first configured provider that supports live quote polling."""
+        for provider in get_data_sources():
+            if provider in {"finnhub", "yfinance"}:
+                return provider
+        return "yfinance"
+
     def _start_backtest_mode(self):
         from backend.data.historical_price_manager import (
             HistoricalPriceManager,