private function buildMigrations()
    {
        $unitDataArray = $this->loadUnitDataIteratorFromDatabase();
        foreach ($unitDataArray as $unitData) {
            $unitOfWork = UnitOfWorkFactory::BuildFromFlatArray($unitData);
            $this->presentUidsOnConstruction[$unitOfWork->getUniqueId()] = true;
            $this->add($unitOfWork);
        }
    }