diff --git a/backend/src/models/Migration.js b/backend/src/models/Migration.js
index e36d10ac3..1b697c8ad 100644
--- a/backend/src/models/Migration.js
+++ b/backend/src/models/Migration.js
@@ -1,5 +1,5 @@
 export default {
   title: { type: 'string', primary: true, token: true },
   description: { type: 'string' },
-  timestamp: { type: 'number', unique: true },
+  createdAt: { type: 'string', isoDate: true, default: () => new Date().toISOString() },
 }