update mongo for multi db support

libs/mongodb-client/src/factory.ts

@@ -27,3 +27,27 @@ export async function disconnectMongoDB(): Promise<void> {
     await client.disconnect();
   }
 }
+
+/**
+ * Set the default database for all operations
+ */
+export function setDefaultDatabase(databaseName: string): void {
+  const client = getMongoDBClient();
+  client.setDefaultDatabase(databaseName);
+}
+
+/**
+ * Get the current default database name
+ */
+export function getCurrentDatabase(): string {
+  const client = getMongoDBClient();
+  return client.getDefaultDatabase();
+}
+
+/**
+ * Get a database instance by name
+ */
+export function getDatabase(databaseName?: string) {
+  const client = getMongoDBClient();
+  return client.getDatabase(databaseName);
+}