diff --git a/server/.sqruff b/.sqruff
similarity index 100%
rename from server/.sqruff
rename to .sqruff
diff --git a/sql/create/tables.sql b/sql/create/tables.sql
index 41659a8..6ef38cd 100644
--- a/sql/create/tables.sql
+++ b/sql/create/tables.sql
@@ -21,7 +21,7 @@ create table user_account (
     full_name text not null,
     password_hash text not null,
     phone text unique not null,
-    email text unique not null,
+    email text unique not null check (trim(email) like '%@%'),
     is_active boolean not null default true,
     created_at timestamp not null default current_timestamp,
     updated_at timestamp not null default current_timestamp,