class ActiveRecord::ConnectionAdapters::TableDefinition

def timestamps(**options)

t.timestamps null: false

:updated_at to the table. See {connection.add_timestamps}[rdoc-ref:SchemaStatements#add_timestamps]
Appends :datetime columns :created_at and 
def timestamps(**options)
  options[:null] = false if options[:null].nil?
  if !options.key?(:precision) && @conn.supports_datetime_with_precision?
    options[:precision] = 6
  end
  column(:created_at, :datetime, **options)
  column(:updated_at, :datetime, **options)
end