diff --git a/database/migrations/2026_09_11_161746_build2grouprule_groupid_foreign_key_constraint.php b/database/migrations/2026_09_11_161746_build2grouprule_groupid_foreign_key_constraint.php
new file mode 100644
index 0000000000..ef0b7b7f0e
--- /dev/null
+++ b/database/migrations/2026_09_11_161746_build2grouprule_groupid_foreign_key_constraint.php
@@ -0,0 +1,26 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        DB::statement('ALTER TABLE build2grouprule ALTER COLUMN groupid DROP DEFAULT');
+
+        DB::delete('
+            DELETE FROM build2grouprule
+            WHERE NOT EXISTS (
+                SELECT 1
+                FROM buildgroup
+                WHERE buildgroup.id = build2grouprule.groupid
+            )
+        ');
+
+        DB::statement('ALTER TABLE build2grouprule ADD FOREIGN KEY (groupid) REFERENCES buildgroup (id) ON DELETE CASCADE');
+    }
+
+    public function down(): void
+    {
+    }
+};