fixed some some mongdb stuff, and added hide objects

libs/mongodb-client/src/singleton.ts

@@ -7,19 +7,38 @@ import type { Db } from 'mongodb';
  * Provides global access to a single MongoDB connection
  */
 let instance: MongoDBClient | null = null;
+let initPromise: Promise<MongoDBClient> | null = null;
 
 /**
  * Initialize the singleton MongoDB client
  */
 export async function connectMongoDB(config?: MongoDBClientConfig): Promise<MongoDBClient> {
-  if (!instance) {
-    if (!config) {
-      throw new Error('MongoDB client not initialized. Call connectMongoDB(config) first.');
-    }
-    instance = new MongoDBClient(config);
-    await instance.connect();
+  if (instance) {
+    return instance;
+  }
+
+  if (initPromise) {
+    return initPromise;
+  }
+
+  if (!config) {
+    throw new Error('MongoDB client not initialized. Call connectMongoDB(config) first.');
+  }
+
+  initPromise = (async () => {
+    const client = new MongoDBClient(config);
+    await client.connect();
+    instance = client;
+    return client;
+  })();
+
+  try {
+    return await initPromise;
+  } catch (error) {
+    // Reset promise on error so next call can retry
+    initPromise = null;
+    throw error;
   }
-  return instance;
 }
 
 /**
@@ -59,4 +78,5 @@ export async function disconnectMongoDB(): Promise<void> {
     await instance.disconnect();
     instance = null;
   }
+  initPromise = null;
 }