use SL::DB::MetaSetup::RequirementSpec;
use SL::DB::Manager::RequirementSpec;
+use SL::DB::Helper::AttrDuration;
use SL::DB::Helper::LinkedRecords;
use SL::Locale::String;
use SL::Util qw(_hashify);
__PACKAGE__->meta->initialize;
+__PACKAGE__->attr_duration(qw(time_estimation));
+
__PACKAGE__->before_save('_before_save_initialize_not_null_columns');
sub validate {