zammad/db/migrate/20201005084847_agent_customer_permission.rb

class AgentCustomerPermission < ActiveRecord::Migration[5.2]
  def change

    # return if it's a new setup
    return if !Setting.exists?(name: 'system_init_done')

    Permission.where(name: ['ticket.agent', 'ticket.customer', 'chat.agent', 'cti.agent']).each do |permission|
      permission.preferences.delete(:not)
      permission.save!
    end
  end
end