postgres index on email column

sql/01_user.sql

@@ -1,8 +1,10 @@
-create table users (
+create table if not exists users (
     id int generated always as identity,
     email text unique not null,
     secret text not null,
     name text not null,
 
     primary key (id)
-);
+);
+
+create index if not exists users_email_idx on users(email);