How to use a custom PostgreSQL type in SeaORM?

Question

I have the following table in postgres

create table retailers(id: integer, name: citext); 

citext is just case insensitive text in PostgreSQL. How do I modify the Entity creation in SeaORM to support that?

When I generate entities in SeaORM in rust, I get the following error:

error: Missing macro attribute, either `string_value` or `num_value` should be specified or specify repr[X] and have a value for every entry
  --> src/entity/sea_orm_active_enums.rs:10:5

How do I create new types in SeaORM in Rust?