diff --git a/packages/backend/src/models/base.ts b/packages/backend/src/models/base.ts
new file mode 100644
index 00000000..d2913657
--- /dev/null
+++ b/packages/backend/src/models/base.ts
@@ -0,0 +1,21 @@
+import { Model, QueryContext, ModelOptions } from 'objection';
+
+class Base extends Model {
+  created_at!: string;
+  updated_at!: string;
+
+  async $beforeInsert(queryContext: QueryContext) {
+    await super.$beforeInsert(queryContext);
+
+    this.created_at = new Date().toISOString();
+    this.updated_at = new Date().toISOString();
+  }
+
+  async $beforeUpdate(opt: ModelOptions, queryContext: QueryContext) {
+    await super.$beforeUpdate(opt, queryContext);
+
+    this.updated_at = new Date().toISOString();
+  }
+}
+
+export default Base;
diff --git a/packages/backend/src/models/user.ts b/packages/backend/src/models/user.ts
index 6e360a53..7b9df512 100644
--- a/packages/backend/src/models/user.ts
+++ b/packages/backend/src/models/user.ts
@@ -1,7 +1,8 @@
-import { Model, QueryContext, ModelOptions } from 'objection';
+import { QueryContext, ModelOptions } from 'objection';
+import Base from './base'
 import bcrypt from 'bcrypt';
 
-class User extends Model {
+class User extends Base {
   id!: number
   email!: string
   password!: string
@@ -14,7 +15,7 @@ class User extends Model {
 
     properties: {
       id: { type: 'integer' },
-      email: { type: 'email', minLength: 1, maxLength: 255 },
+      email: { type: 'string', format: 'email', minLength: 1, maxLength: 255 },
       password: { type: 'string', minLength: 1, maxLength: 255 },
     }
   }