add support for alternative ticker universe formatting

app/providers/alpaca.py

@@ -25,13 +25,24 @@ class AlpacaOHLCVProvider:
             raise ProviderError("Alpaca API key and secret are required")
         self._client = StockHistoricalDataClient(api_key, api_secret)
 
+    @staticmethod
+    def _to_alpaca_symbol(symbol: str) -> str:
+        """Convert internal symbol format (BRK-B) to Alpaca format (BRK.B)."""
+        return symbol.replace("-", ".")
+
+    @staticmethod
+    def _from_alpaca_symbol(symbol: str) -> str:
+        """Convert Alpaca symbol format (BRK.B) back to internal format (BRK-B)."""
+        return symbol.replace(".", "-")
+
     async def fetch_ohlcv(
         self, ticker: str, start_date: date, end_date: date
     ) -> list[OHLCVData]:
         """Fetch daily OHLCV bars for *ticker* between *start_date* and *end_date*."""
+        alpaca_symbol = self._to_alpaca_symbol(ticker)
         try:
             request = StockBarsRequest(
-                symbol_or_symbols=ticker,
+                symbol_or_symbols=alpaca_symbol,
                 timeframe=TimeFrame.Day,
                 start=start_date,
                 end=end_date,
@@ -42,11 +53,11 @@ class AlpacaOHLCVProvider:
             bars = await asyncio.to_thread(self._client.get_stock_bars, request)
 
             results: list[OHLCVData] = []
-            bar_set = bars.get(ticker, []) if hasattr(bars, "get") else getattr(bars, "data", {}).get(ticker, [])
+            bar_set = bars.get(alpaca_symbol, []) if hasattr(bars, "get") else getattr(bars, "data", {}).get(alpaca_symbol, [])
             for bar in bar_set:
                 results.append(
                     OHLCVData(
-                        ticker=ticker,
+                        ticker=ticker,  # use original internal symbol
                         date=bar.timestamp.date(),
                         open=float(bar.open),
                         high=float(bar.high),