add support for alternative ticker universe formatting

app/providers/fundamentals_chain.py

@@ -38,6 +38,14 @@ def _safe_float(value: object) -> float | None:
         return None
 
 
+def _to_api_symbol(symbol: str) -> str:
+    """Convert internal symbol format (BRK-B) to API format (BRK.B).
+
+    Finnhub and Alpha Vantage use dot-separated share class notation.
+    """
+    return symbol.replace("-", ".")
+
+
 class FinnhubFundamentalProvider:
     """Fundamentals provider backed by Finnhub free endpoints."""
 
@@ -49,19 +57,20 @@ class FinnhubFundamentalProvider:
 
     async def fetch_fundamentals(self, ticker: str) -> FundamentalData:
         unavailable: dict[str, str] = {}
+        api_symbol = _to_api_symbol(ticker)
 
         async with httpx.AsyncClient(timeout=30.0, verify=_CA_BUNDLE_PATH) as client:
             profile_resp = await client.get(
                 f"{self._base_url}/stock/profile2",
-                params={"symbol": ticker, "token": self._api_key},
+                params={"symbol": api_symbol, "token": self._api_key},
             )
             metric_resp = await client.get(
                 f"{self._base_url}/stock/metric",
-                params={"symbol": ticker, "metric": "all", "token": self._api_key},
+                params={"symbol": api_symbol, "metric": "all", "token": self._api_key},
             )
             earnings_resp = await client.get(
                 f"{self._base_url}/stock/earnings",
-                params={"symbol": ticker, "limit": 1, "token": self._api_key},
+                params={"symbol": api_symbol, "limit": 1, "token": self._api_key},
             )
 
         for resp, endpoint in (
@@ -121,19 +130,20 @@ class AlphaVantageFundamentalProvider:
 
     async def fetch_fundamentals(self, ticker: str) -> FundamentalData:
         unavailable: dict[str, str] = {}
+        api_symbol = _to_api_symbol(ticker)
 
         async with httpx.AsyncClient(timeout=30.0, verify=_CA_BUNDLE_PATH) as client:
             overview_resp = await client.get(
                 self._base_url,
-                params={"function": "OVERVIEW", "symbol": ticker, "apikey": self._api_key},
+                params={"function": "OVERVIEW", "symbol": api_symbol, "apikey": self._api_key},
             )
             earnings_resp = await client.get(
                 self._base_url,
-                params={"function": "EARNINGS", "symbol": ticker, "apikey": self._api_key},
+                params={"function": "EARNINGS", "symbol": api_symbol, "apikey": self._api_key},
             )
             income_resp = await client.get(
                 self._base_url,
-                params={"function": "INCOME_STATEMENT", "symbol": ticker, "apikey": self._api_key},
+                params={"function": "INCOME_STATEMENT", "symbol": api_symbol, "apikey": self._api_key},
             )
 
         for resp, endpoint in (