class CreateContractProcesses < ActiveRecord::Migration
  def self.up
    create_table :contract_processes do |t|
      t.integer  :contract_id,    :null => false
      t.integer  :author_id,  :null => false
      t.integer  :old_value
      t.integer  :value,      :null => false
      t.datetime :created_at
    end
    add_index :contract_processes, [:author_id]
    add_index :contract_processes, [:contract_id]
  end

  def self.down
    drop_table :contract_processes
  end
end