diff --git a/backend/migrations_demo/20260215193500_demo_default_theme.sql b/backend/migrations_demo/20260215193500_demo_default_theme.sql
new file mode 100644
index 0000000..507dcc5
--- /dev/null
+++ b/backend/migrations_demo/20260215193500_demo_default_theme.sql
@@ -0,0 +1,3 @@
+UPDATE instance_settings
+SET theme_id = 'breeze-dark'
+WHERE theme_id = 'neutral';