Manual Installation

 -- +micrate Up
 ALTER TABLE users ADD COLUMN sign_in_count VARCHAR NULL;
 ALTER TABLE users ADD COLUMN current_sign_in_ip VARCHAR NULL;
 ALTER TABLE users ADD COLUMN last_sign_in_ip VARCHAR NULL;
 ALTER TABLE users ADD COLUMN current_sign_in_at TIMESTAMP NULL;
 ALTER TABLE users ADD COLUMN last_sign_in_at TIMESTAMP NULL;
​
 -- +micrate Down
 ALTER TABLE users DROP COLUMN sign_in_count VARCHAR NULL;
 ALTER TABLE users DROP COLUMN current_sign_in_ip VARCHAR NULL;
 ALTER TABLE users DROP COLUMN last_sign_in_ip VARCHAR NULL;
 ALTER TABLE users DROP COLUMN current_sign_in_at TIMESTAMP NULL;
 ALTER TABLE users DROP COLUMN last_sign_in_at TIMESTAMP NULL;

 class AddTrackableToUsers < Jennifer::Migration::Base
     def up
     change_table(:users) do |t|
         t.add_column(:sign_in_count, :string)
         t.add_column(:current_sign_in_ip, :string)
         t.add_column(:last_sign_in_ip, :string)
         t.add_column(:current_sign_in_at, :timestamp)
         t.add_column(:last_sign_in_at, :timestamp)
     end
     end
​
     def down
     change_table(:users) do |t|
         t.drop_column :sign_in_count
         t.drop_column :current_sign_in_ip
         t.drop_column :last_sign_in_ip
         t.drop_column :current_sign_in_at
         t.drop_column :last_sign_in_at
     end
     end
 end

 amber db migrate

 crystal sam.cr -- db:migrate

 mochi_granite(:trackable)

 mochi_jennifer(:trackable)