add_timestamps

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 392
      def add_timestamps(table_name, **options)
        options[:null] = false if options[:null].nil?

        if !options.key?(:precision)
          options[:precision] = 6
        end

        alter_table(table_name) do |definition|
          definition.column :created_at, :datetime, **options
          definition.column :updated_at, :datetime, **options
        end
      end