diff --git a/backend/src/migrations/006_seed_admin.sql b/backend/src/migrations/006_seed_admin.sql
new file mode 100644
index 0000000..911874e
--- /dev/null
+++ b/backend/src/migrations/006_seed_admin.sql
@@ -0,0 +1,6 @@
+-- Create default superadmin user (admin/admin)
+-- Password should be changed after first login!
+
+INSERT INTO users (username, password_hash, role, is_superadmin)
+VALUES ('admin', '$2b$10$cYj5vFnPIqWDngjGf9guG.b.L2itqRbvcTPqxHPZIWtUHfT353L7W', 'admin', true)
+ON CONFLICT (username) DO NOTHING;