diff --git a/src/main/kotlin/routes/Article.kt b/src/main/kotlin/routes/Article.kt
index f952dff..4a26a0d 100644
--- a/src/main/kotlin/routes/Article.kt
+++ b/src/main/kotlin/routes/Article.kt
@@ -74,7 +74,7 @@ object ArticlesPaths {
             val tags: List<String> = emptyList(),
             val draft: Boolean = false,
             val versionId: UUID?,
-            val workgroup: WorkgroupRef?
+            val workgroup: WorkgroupRef? = null
         )
 
         private val workgroupRepository: WorkgroupRepository by inject()
diff --git a/src/main/resources/sql/fixtures/04-article.sql b/src/main/resources/sql/fixtures/04-article.sql
index 302f18d..c7b5112 100644
--- a/src/main/resources/sql/fixtures/04-article.sql
+++ b/src/main/resources/sql/fixtures/04-article.sql
@@ -13,19 +13,19 @@ declare
 begin
     insert into article (id, version_id, created_by_id, workgroup_id, title, anonymous, content, description, tags, created_at, draft)
     select
-        uuid_in(md5('article'||row_number() over ())::cstring),
-        uuid_in(md5('article_v'||row_number() over () % (_citizen_count / 2))::cstring),
+        uuid_in(md5('article'||rn)::cstring),
+        uuid_in(md5('article_v'||rn % ((_citizen_count * 50) / 2))::cstring),
         z.id,
-        case when row_number() over () % 2 = 0 then w.id end,
-        'title' || row_number() over (),
-        row_number() over () % 3 = 0,
-        'content' || row_number() over (),
-        'description' || row_number() over (),
-        _tags[(row_number() over () % 5):(row_number() over () % 9)],
-        now() + (row_number() over () * interval '7 minute 3 second'),
-        (row_number() over () % 7) = 0
-    from (select *, row_number() over () rn from citizen z) z
-    join (select *, row_number() over () % _workgroup_count rn from workgroup) w using (rn);
+        case when rn % 2 = 0 then w.id end,
+        'title' || rn,
+        rn % 3 = 0,
+        'content' || rn,
+        'description' || rn,
+        _tags[(rn % 5):(rn % 9)],
+        now() + (rn * interval '7 minute 3 second'),
+        (rn % 7) = 0
+    from (select *, row_number() over () rn from citizen z, lateral generate_series(1, 50) g) z
+    left join (select *, row_number() over () % _workgroup_count rn from workgroup) w using (rn);
 
     insert into article_relations (source_id, target_id, created_by_id, comment)
     select
@@ -33,7 +33,7 @@ begin
         dest.id,
         src.created_by_id,
         'comment' || rn
-    from (select *, row_number() over () rn from article, lateral generate_series(1, 5) g) src
+    from (select *, row_number() over () rn from article) src
     join (select *, row_number() over () +5 rn from article) dest using (rn);
 
     raise notice 'article fixtures done';