diff --git a/rest-api/db/migrations/20250323134405_username_blocklist.sql b/rest-api/db/migrations/20250323134405_username_blocklist.sql
new file mode 100644
index 0000000..8b89932
--- /dev/null
+++ b/rest-api/db/migrations/20250323134405_username_blocklist.sql
@@ -0,0 +1,13 @@
+-- migrate:up
+ALTER TABLE internal.user
+  DROP CONSTRAINT username_not_blocked;
+
+ALTER TABLE internal.user
+  ADD CONSTRAINT username_not_blocked CHECK (LOWER(username) NOT IN ('admin', 'administrator', 'api', 'auth', 'blog', 'cdn', 'docs', 'help', 'login', 'logout', 'profile', 'preview', 'previews', 'register', 'settings', 'setup', 'signin', 'signup', 'support', 'test', 'www'));
+
+-- migrate:down
+ALTER TABLE internal.user
+  DROP CONSTRAINT username_not_blocked;
+
+ALTER TABLE internal.user
+  ADD CONSTRAINT username_not_blocked CHECK (LOWER(username) NOT IN ('admin', 'administrator', 'api', 'auth', 'blog', 'cdn', 'docs', 'help', 'login', 'logout', 'profile', 'register', 'settings', 'setup', 'signin', 'signup', 'support', 'test', 'www'));
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