CleanupReservations.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryReservations\Model\ResourceModel;

use Magento\Framework\App\ResourceConnection;
use Magento\InventoryReservationsApi\Model\ReservationInterface;
use Magento\InventoryReservationsApi\Model\CleanupReservationsInterface;

class CleanupReservations implements CleanupReservationsInterface
{
    private $resource;

    private $groupConcatMaxLen;

    public function __construct(
        ResourceConnection $resource,
        int $groupConcatMaxLen
    ) {
        $this->resource = $resource;
        $this->groupConcatMaxLen = $groupConcatMaxLen;
    }

    public function execute(): void
    {
        $connection = $this->resource->getConnection();
        $reservationTable = $this->resource->getTableName('inventory_reservation');

        $select = $connection->select()
            ->from(
                $reservationTable,
                ['GROUP_CONCAT(' . ReservationInterface::RESERVATION_ID . ')']
            )
            ->group([ReservationInterface::STOCK_ID, ReservationInterface::SKU])
            ->having('SUM(' . ReservationInterface::QUANTITY . ') = 0');
            $connection->query('SET group_concat_max_len = ' . $this->groupConcatMaxLen);
        $groupedReservationIds = implode(',', $connection->fetchCol($select));

        $condition = [ReservationInterface::RESERVATION_ID . ' IN (?)' => explode(',', $groupedReservationIds)];
        $connection->delete($reservationTable, $condition);
    }
}