phase-8f: persistant cache locally

server/clients/YahooFinanceClient.ts

@@ -11,10 +11,16 @@ export class YahooFinanceClient {
     });
   }
 
+  /** Normalise ticker before hitting Yahoo: BRK.B → BRK-B */
+  private static normalise(ticker: string): string {
+    return ticker.toUpperCase().replace(/\./g, '-');
+  }
+
   async fetchSummary(ticker: string, retries = 3, backoff = 1000): Promise<any> {
+    const normalised = YahooFinanceClient.normalise(ticker);
     for (let attempt = 0; attempt < retries; attempt++) {
       try {
-        return await this.lib.quoteSummary(ticker, { modules: YAHOO_MODULES });
+        return await this.lib.quoteSummary(normalised, { modules: YAHOO_MODULES });
       } catch (error) {
         if (attempt === retries - 1) throw error;
         await new Promise<void>((resolve) => setTimeout(resolve, backoff * (attempt + 1)));
@@ -24,7 +30,9 @@ export class YahooFinanceClient {
 
   async fetchCalendarEvents(ticker: string): Promise<any | null> {
     try {
-      const result = await this.lib.quoteSummary(ticker, { modules: ['calendarEvents'] });
+      const result = await this.lib.quoteSummary(YahooFinanceClient.normalise(ticker), {
+        modules: ['calendarEvents'],
+      });
       return result.calendarEvents ?? null;
     } catch {
       return null;