Add configurable data providers and localize frontend UI

backend/services/market.py

@@ -10,6 +10,8 @@ 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.data.provider_utils import normalize_symbol
 
 logger = logging.getLogger(__name__)
 
@@ -40,7 +42,7 @@ class MarketService:
         backtest_start_date: Optional[str] = None,
         backtest_end_date: Optional[str] = None,
     ):
-        self.tickers = tickers
+        self.tickers = [normalize_symbol(ticker) for ticker in tickers]
         self.poll_interval = poll_interval
         self.mock_mode = mock_mode
         self.backtest_mode = backtest_mode
@@ -123,11 +125,16 @@ class MarketService:
     def _start_real_mode(self):
         from backend.data.polling_price_manager import PollingPriceManager
 
-        if not self.api_key:
+        provider = get_data_source()
+        if provider == "local_csv":
+            provider = "yfinance"
+
+        if provider == "finnhub" and not self.api_key:
             raise ValueError("API key required for live mode")
         self._price_manager = PollingPriceManager(
             api_key=self.api_key,
             poll_interval=self.poll_interval,
+            provider=provider,
         )
         self._price_manager.add_price_callback(self._make_price_callback())
         self._price_manager.subscribe(self.tickers)