diff --git a/examples/app/src/routes/users.ts b/examples/app/src/routes/users.ts
index 2cdc6b9..6c7ef84 100644
--- a/examples/app/src/routes/users.ts
+++ b/examples/app/src/routes/users.ts
@@ -1,3 +1,4 @@
+import crypto from 'crypto'
 import type { FastifyInstance } from 'fastify'
 
 export async function userRoutes(fastify: FastifyInstance) {
@@ -30,7 +31,7 @@ export async function userRoutes(fastify: FastifyInstance) {
     },
   }, async (req, reply) => {
     const { name, email } = req.body as { name: string; email: string }
-    const id = `user-${Date.now()}`
+    const id = `user-${crypto.createHash('sha256').update(email).digest('hex').slice(0, 8)}`
     const user = { id, name, email }
     fastify.db.users.set(id, user)
     reply.status(201)