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server/utils/db.js

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+import { MongoClient } from 'mongodb'
+
+let client = null
+let db = null
+
+export async function connectToDatabase() {
+  if (db) {
+    return db
+  }
+
+  const uri = process.env.MONGO_URI
+  if (!uri) {
+    throw new Error('MONGO_URI environment variable is not set')
+  }
+
+  try {
+    client = new MongoClient(uri)
+    await client.connect()
+    db = client.db('faber-finances')
+    console.log('Connected to MongoDB')
+    return db
+  } catch (error) {
+    console.error('Failed to connect to MongoDB:', error)
+    throw error
+  }
+}
+
+export async function getCollection(name) {
+  const database = await connectToDatabase()
+  return database.collection(name)
+}
+
+// Close connection (useful for cleanup)
+export async function closeDatabaseConnection() {
+  if (client) {
+    await client.close()
+    client = null
+    db = null
+    console.log('Disconnected from MongoDB')
+  }
+}