class ChangeSentAtToDatetime < ActiveRecord::Migration
    def self.up
        remove_column :incoming_messages, :sent_at
        add_column :incoming_messages, :sent_at, :timestamp
        ActiveRecord::Base.connection.execute("update incoming_messages set last_parsed = null")
    end

    def self.down
        remove_column :incoming_messages, :sent_at
        add_column :incoming_messages, :sent_at, :time
    end
end