redmine/db/migrate/20091017213910_add_missing_indexes_to_issues.rb

class AddMissingIndexesToIssues < ActiveRecord::Migration[4.2]
  def self.up
    add_index :issues, :status_id
    add_index :issues, :category_id
    add_index :issues, :assigned_to_id
    add_index :issues, :fixed_version_id
    add_index :issues, :tracker_id
    add_index :issues, :priority_id
    add_index :issues, :author_id
  end

  def self.down
    remove_index :issues, :status_id
    remove_index :issues, :category_id
    remove_index :issues, :assigned_to_id
    remove_index :issues, :fixed_version_id
    remove_index :issues, :tracker_id
    remove_index :issues, :priority_id
    remove_index :issues, :author_id
  end
end