diff --git a/backend/services/core/migrations/20230822094308_add_custom_author_type_to_articles.ts b/backend/services/core/migrations/20230822094308_add_custom_author_type_to_articles.ts
index 38787b7c..f2157acd 100644
--- a/backend/services/core/migrations/20230822094308_add_custom_author_type_to_articles.ts
+++ b/backend/services/core/migrations/20230822094308_add_custom_author_type_to_articles.ts
@@ -28,6 +28,10 @@ export async function up(knex: Knex): Promise<void> {
     table.enu('type', ['Member', 'Mandate', 'Custom'], { useNative: true, enumName: 'author_type' }).notNullable().defaultTo('Member');
     table.uuid('temp_article_id').unsigned().notNullable().references('articles.id')
       .comment('Temporary column during migration');
+
+    table.check(`type = 'Member' AND mandate_id IS NULL AND custom_id IS NULL
+      OR type = 'Mandate' AND mandate_id IS NOT NULL AND custom_id IS NULL
+      OR type = 'Custom' AND mandate_id IS NULL AND custom_id IS NOT NULL`, undefined, 'enforce_author_type');
   });
   // Get all articles posted by a member, not as a mandate
   const memberAuthorArticles = await knex('articles').select('id', 'author_id', 'author_type', 'published_datetime', 'latest_edit_datetime')
diff --git a/backend/services/core/src/types/graphql.ts b/backend/services/core/src/types/graphql.ts
index f6a11ad1..b20e2dc1 100644
--- a/backend/services/core/src/types/graphql.ts
+++ b/backend/services/core/src/types/graphql.ts
@@ -1895,7 +1895,7 @@ export type ReferenceResolver<TResult, TReference, TContext> = (
       type NullableCheck<T, S> = Maybe<T> extends T ? Maybe<ListCheck<NonNullable<T>, S>> : ListCheck<T, S>;
       type ListCheck<T, S> = T extends (infer U)[] ? NullableCheck<U, S>[] : GraphQLRecursivePick<T, S>;
       export type GraphQLRecursivePick<T, S> = { [K in keyof T & keyof S]: ScalarCheck<T[K], S[K]> };
-
+    
 
 export type ResolverWithResolve<TResult, TParent, TContext, TArgs> = {
   resolve: ResolverFn<TResult, TParent, TContext, TArgs>;