fixed exchange mappings and added visible column

apps/data-sync-service/src/services/sync-manager.ts

@@ -259,8 +259,8 @@ export class SyncManager {
 
   private async createExchange(qmExchange: any): Promise<void> {
     const query = `
-      INSERT INTO exchanges (code, name, country, currency)
-      VALUES ($1, $2, $3, $4)
+      INSERT INTO exchanges (code, name, country, currency, visible)
+      VALUES ($1, $2, $3, $4, $5)
       ON CONFLICT (code) DO NOTHING
     `;
 
@@ -269,6 +269,7 @@ export class SyncManager {
       qmExchange.exchangeShortName || qmExchange.name,
       qmExchange.countryCode || 'US',
       'USD', // Default currency, can be improved
+      true, // New exchanges are visible by default
     ]);
   }