diff --git a/app/enums/visibility.ts b/app/enums/visibility.ts
new file mode 100644
index 0000000..862b3e0
--- /dev/null
+++ b/app/enums/visibility.ts
@@ -0,0 +1,4 @@
+export enum Visibility {
+  PUBLIC = 'PUBLIC',
+  PRIVATE = 'PRIVATE',
+}
diff --git a/app/models/collection.ts b/app/models/collection.ts
index 6576085..2e61377 100644
--- a/app/models/collection.ts
+++ b/app/models/collection.ts
@@ -3,6 +3,7 @@ import Link from '#models/link';
 import User from '#models/user';
 import { belongsTo, column, manyToMany } from '@adonisjs/lucid/orm';
 import type { BelongsTo, ManyToMany } from '@adonisjs/lucid/types/relations';
+import { Visibility } from '../enums/visibility.js';
 
 export default class Collection extends AppBaseModel {
   @column()
@@ -26,8 +27,3 @@ export default class Collection extends AppBaseModel {
   @manyToMany(() => Link)
   declare links: ManyToMany<typeof Link>;
 }
-
-export enum Visibility {
-  PUBLIC = 'PUBLIC',
-  PRIVATE = 'PRIVATE',
-}
diff --git a/config/shield.ts b/config/shield.ts
index 229235d..8d09cf9 100644
--- a/config/shield.ts
+++ b/config/shield.ts
@@ -16,7 +16,7 @@ const shieldConfig = defineConfig({
    * to learn more
    */
   csrf: {
-    enabled: true,
+    enabled: false,
     exceptRoutes: [],
     enableXsrfCookie: true,
     methods: ['POST', 'PUT', 'PATCH', 'DELETE'],
diff --git a/database/migrations/1714253983443_create_collections_table.ts b/database/migrations/1714253983443_create_collections_table.ts
index 8c41068..db831a3 100644
--- a/database/migrations/1714253983443_create_collections_table.ts
+++ b/database/migrations/1714253983443_create_collections_table.ts
@@ -1,5 +1,5 @@
-import { Visibility } from '#models/collection';
 import { BaseSchema } from '@adonisjs/lucid/schema';
+import { Visibility } from '../../app/enums/visibility.js';
 
 export default class extends BaseSchema {
   protected tableName = 'collections';
@@ -12,7 +12,7 @@ export default class extends BaseSchema {
 
       table.string('name', 254).notNullable();
       table.string('description', 254);
-      table.uuid('next_id').notNullable();
+      table.uuid('next_id').defaultTo(null);
       table.uuid('author_id').notNullable();
       table.enum('visibility', Object.values(Visibility), {
         useNative: true,