diff --git a/index.js b/index.js
index 7039eb5..8462f52 100644
--- a/index.js
+++ b/index.js
@@ -4,6 +4,7 @@ const bcrypt = require('bcryptjs');
 const jwt = require('jsonwebtoken');
 const { ActivityPubRouter, createActor } = require('activitypub-express');
 const uuid = require('uuid');
+const db = require('quick.db'); // Import quick.db
 const fetch = require('node-fetch');
 
 const app = express();
@@ -11,11 +12,6 @@ const port = 3000;
 
 const SECRET_KEY = 'your_secret_key'; // Replace with a secure key in a real app
 
-// In-memory "database" for users and posts
-const users = {};
-const posts = {};
-const followers = {};
-
 // Middleware to parse JSON
 app.use(bodyParser.json());
 
@@ -47,13 +43,16 @@ const authenticate = (req, res, next) => {
 app.post('/users', async (req, res) => {
     const { username, displayName, password } = req.body;
 
-    if (users[username]) {
+    // Check if user already exists
+    const existingUser = db.get(`user_${username}`);
+    if (existingUser) {
         return res.status(400).json({ error: 'User already exists' });
     }
 
     // Hash the password before saving
     const hashedPassword = await bcrypt.hash(password, 10);
 
+    // Create the actor and store it in the DB
     const actor = createActor({
         id: actorURL(username),
         username,
@@ -64,7 +63,9 @@ app.post('/users', async (req, res) => {
         following: `http://localhost:${port}/users/${username}/following`,
     });
 
-    users[username] = { ...actor, password: hashedPassword };
+    // Store actor info and password in the database
+    db.set(`user_${username}`, { ...actor, password: hashedPassword });
+
     res.status(201).json(actor);
 });
 
@@ -72,7 +73,8 @@ app.post('/users', async (req, res) => {
 app.post('/login', async (req, res) => {
     const { username, password } = req.body;
 
-    const user = users[username];
+    // Retrieve user from the database
+    const user = db.get(`user_${username}`);
     if (!user) {
         return res.status(404).json({ error: 'User not found' });
     }
@@ -97,19 +99,24 @@ app.post('/users/:username/posts', authenticate, (req, res) => {
         return res.status(403).json({ error: 'You can only post as yourself' });
     }
 
-    if (!users[username]) {
+    // Retrieve the user from the database
+    const user = db.get(`user_${username}`);
+    if (!user) {
         return res.status(404).json({ error: 'User not found' });
     }
 
+    // Create a post and store it in the database
     const post = {
         id: `http://localhost:${port}/posts/${uuid.v4()}`,
         type: 'Note',
         content,
-        author: users[username],
+        author: user,
         published: new Date().toISOString(),
     };
 
-    posts[post.id] = post;
+    // Store the post in the database
+    db.set(`post_${post.id}`, post);
+
     res.status(201).json(post);
 });
 
@@ -121,11 +128,8 @@ app.get('/users/:username/posts', authenticate, (req, res) => {
         return res.status(403).json({ error: 'You can only view your own posts' });
     }
 
-    if (!users[username]) {
-        return res.status(404).json({ error: 'User not found' });
-    }
-
-    const userPosts = Object.values(posts).filter(post => post.author.username === username);
+    // Retrieve all posts from the database
+    const userPosts = Object.values(db.get("posts") || {}).filter(post => post.author.username === username);
     res.json(userPosts);
 });
 
@@ -137,18 +141,19 @@ activityPubRouter.post('/users/:username/inbox', authenticate, async (req, res)
     const { username } = req.params;
     const activity = req.body;
 
-    if (!users[username]) {
+    if (!db.get(`user_${username}`)) {
         return res.status(404).json({ error: 'User not found' });
     }
 
     if (activity.type === 'Follow') {
         const actor = activity.actor;
 
-        // Add follower to the user’s list of followers
-        if (!followers[username]) {
-            followers[username] = [];
-        }
-        followers[username].push(actor.id);
+        // Retrieve followers list and add new follower
+        const followersList = db.get(`followers_${username}`) || [];
+        followersList.push(actor.id);
+
+        // Store the updated followers list in the database
+        db.set(`followers_${username}`, followersList);
 
         res.status(200).json({ status: 'Followed successfully' });
 
@@ -163,23 +168,25 @@ activityPubRouter.post('/users/:username/inbox', authenticate, async (req, res)
 activityPubRouter.get('/users/:username', (req, res) => {
     const { username } = req.params;
 
-    if (!users[username]) {
+    const user = db.get(`user_${username}`);
+    if (!user) {
         return res.status(404).json({ error: 'User not found' });
     }
 
-    res.json(users[username]);
+    res.json(user);
 });
 
 // Outbox endpoint to send posts
 activityPubRouter.get('/users/:username/outbox', (req, res) => {
     const { username } = req.params;
 
-    if (!users[username]) {
+    const user = db.get(`user_${username}`);
+    if (!user) {
         return res.status(404).json({ error: 'User not found' });
     }
 
-    // Fetch posts from this user’s outbox
-    const userPosts = Object.values(posts).filter(post => post.author.username === username);
+    // Fetch posts from this user’s outbox (from the DB)
+    const userPosts = Object.values(db.get("posts") || {}).filter(post => post.author.username === username);
     res.json(userPosts);
 });
 
@@ -187,5 +194,5 @@ app.use(activityPubRouter.router);
 
 // Start the server
 app.listen(port, () => {
-    console.log(`Federated social network with authentication running at http://localhost:${port}`);
+    console.log(`Federated social network with SQLite (quick.db) running at http://localhost:${port}`);
 });