Add hourly Alpha token cache refresh

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/data/market/main.go

@@ -33,9 +33,18 @@ func NewMarketData() *MarketData {
 	}
 	_ = ms.StartFutureWsMarkPrice()
 	_ = ms.StartSpotWsMarkPrice()
-	
-	// Initialize Alpha token cache
-	go ms.refreshAlphaTokenCache()
-	
+
+	// Initialize Alpha token cache and refresh every hour
+	go ms.alphaCacheRefreshLoop()
+
 	return ms
 }
+
+func (ms *MarketData) alphaCacheRefreshLoop() {
+	ms.refreshAlphaTokenCache()
+	ticker := time.NewTicker(time.Hour)
+	defer ticker.Stop()
+	for range ticker.C {
+		ms.refreshAlphaTokenCache()
+	}
+}