Rails Heroku change column data type - ruby-on-rails

Question

I run this command for deploying database to heroku
heroku run rails db:migrate
But I got this error
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:
PG::UndefinedObject: ERROR: type "dateti" does not exist
LINE 1: ALTER TABLE "users" ADD "activated_at" dateti
^
After that I changed wrong datatype "dateti" to "datetime"
class AddActivationToUsers < ActiveRecord::Migration[7.0]
def change
add_column :users, :activation_digest, :string
add_column :users, :activated, :boolean, default: false
add_column :users, :activated_at, :datetime
end
end
But nothing changed. Still get this error. For development and test I use sqlite3 and for production postgresql. This error appear only when I try to deploy to heroku. On local database everything works.
database.yml file
# SQLite. Versions 3.8.0 and up are supported.
# gem install sqlite3
#
# Ensure the SQLite 3 gem is defined in your Gemfile
# gem "sqlite3"
#
default: &default
adapter: sqlite3
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
timeout: 5000
development:
<<: *default
database: db/development.sqlite3
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
<<: *default
database: db/test.sqlite3
production:
adapter: postgresql
encoding: unicode
# For details on connection pooling, see Rails configuration guide
# https://guides.rubyonrails.org/configuring.html#database-pooling
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
database: sample_app_production
username: sample_app
password: <%= ENV['SAMPLE_APP_DATABASE_PASSWORD'] %>

Answer 1

Before change activited_at (datetime) in AddActivationToUsers file. You must rollback AddActivationToUsers in db.
rails db:rollback STEP=n (n migrations where n is the number of recent migrations you want to rollback)
You change activited_at :datetime and save
rails db:migration