Docker compose içerisine Mongodb eklendi ve bağlantıları yapıldı.

server/modules/db.js

@@ -0,0 +1,39 @@
+import { MongoClient } from "mongodb";
+
+const MONGO_HOST = process.env.MONGO_HOST || "mongo";
+const MONGO_PORT = process.env.MONGO_PORT || "27017";
+const MONGO_DB = process.env.MONGO_DB || "dupe";
+const MONGO_USER = process.env.MONGO_USER || "dupe";
+const MONGO_PASS = process.env.MONGO_PASS || "dupe";
+const MONGO_AUTH_SOURCE = process.env.MONGO_AUTH_SOURCE || "admin";
+
+const DEFAULT_URI = `mongodb://${encodeURIComponent(MONGO_USER)}:${encodeURIComponent(
+  MONGO_PASS
+)}@${MONGO_HOST}:${MONGO_PORT}/${encodeURIComponent(MONGO_DB)}?authSource=${encodeURIComponent(
+  MONGO_AUTH_SOURCE
+)}`;
+
+const MONGO_URI = process.env.MONGO_URI || DEFAULT_URI;
+
+let client = null;
+let db = null;
+
+export async function connectMongo() {
+  if (client && db) return { client, db };
+
+  const mongoClient = new MongoClient(MONGO_URI, {
+    maxPoolSize: 10,
+    serverSelectionTimeoutMS: 5000
+  });
+
+  await mongoClient.connect();
+  client = mongoClient;
+  db = mongoClient.db(MONGO_DB);
+
+  console.log(`📦 MongoDB bağlantısı hazır (db: ${db.databaseName})`);
+  return { client, db };
+}
+
+export function getDb() {
+  return db;
+}