zammad/db/seeds/ticket_article_senders.rb

Ticket::Article::Sender.create_if_not_exists(id: 1, name: 'Agent')
Ticket::Article::Sender.create_if_not_exists(id: 2, name: 'Customer')
Ticket::Article::Sender.create_if_not_exists(id: 3, name: 'System')