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File: C:/Redmine-4.x/redmine-4.2.9/db/migrate/079_add_user_preferences_time_zone.rb

class AddUserPreferencesTimeZone < ActiveRecord::Migration[4.2]
  def self.up
    add_column :user_preferences, :time_zone, :string
  end

  def self.down
    remove_column :user_preferences, :time_zone
  end
end