How can timestamps be added to an already existing table in a Rails 5+ database?

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To add timestamps to an already existing table in a Rails 5+ database, you can generate a new migration with the following command:

rails g migration AddTimestampsToTableName

Replace "TableName" with the name of the table you want to add timestamps to.

In the migration file, add the following code to add the timestamps:

class AddTimestampsToTableName < ActiveRecord::Migration[5.0] def change addtimestamps :tablename end end

Again, replace "TableName" with the name of the table you want to add timestamps to.

Then, run the migration with the following command:

rails db:migrate

This will add "createdat" and "updatedat" columns to your table and automatically update them whenever records are created or updated.