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backend/routes/messages.js

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+const express = require('express');
+const router = express.Router();
+const db = require('../db');
+
+// GET /api/messages?userId=123
+router.get('/', async (req, res) => {
+  const userId = req.query.userId;
+  if (!userId) return res.status(400).json({ error: 'userId required' });
+  try {
+    const result = await db.getQuery()(
+      `SELECT id, user_id, sender_type, content, channel, role, direction, created_at, attachment_filename, attachment_mimetype, attachment_size, attachment_data, metadata
+       FROM messages
+       WHERE user_id = $1
+       ORDER BY created_at ASC`,
+      [userId]
+    );
+    res.json(result.rows);
+  } catch (e) {
+    res.status(500).json({ error: 'DB error', details: e.message });
+  }
+});
+
+module.exports = router;