delete_version

# File activerecord/lib/active_record/schema_migration.rb, line 27
    def delete_version(version)
      dm = Arel::DeleteManager.new(arel_table)
      dm.wheres = [arel_table[primary_key].eq(version)]

      @pool.with_connection do |connection|
        connection.delete(dm, "#{self.class} Destroy")
      end
    end