namespace Customize\Entity;

use Doctrine\ORM\Mapping as ORM;
use Eccube\Annotation\EntityExtension;

/**
 * @EntityExtension("Eccube\Entity\BaseInfo")
 */
trait BaseInfoTrait
{
    /**
     * @var string|null
     *
     * @ORM\Column(name="delivery_free_amount_c1", type="decimal", precision=12, scale=2, nullable=true, options={"unsigned":true})
     */
    private $delivery_free_amount_c1;

    /**
     * Get deliveryFreeAmountC1.
     *
     * @return string|null
     */
    public function getDeliveryFreeAmountC1()
    {
        return $this->delivery_free_amount_c1;
    }

    /**
     * Set deliveryFreeAmountC1.
     *
     * @param string|null $deliveryFreeAmountC1
     *
     * @return BaseInfo
     */
    public function setDeliveryFreeAmountC1($deliveryFreeAmountC1 = null)
    {
        $this->delivery_free_amount_c1 = $deliveryFreeAmountC1;

        return $this;
    }
}

[root@localhost 〇〇〇〇〇]# php bin/console eccube:generate:proxies
gen -> /var/www/〇〇〇〇〇/app/proxy/entity/src/Eccube/Entity/MailTemplate.php
gen -> /var/www/〇〇〇〇〇/app/proxy/entity/src/Eccube/Entity/BaseInfo.php
[root@localhost 〇〇〇〇〇]# php bin/console doctrine:schema:update --dump-sql --force
gen -> /tmp/proxy_p7LP43zDTNLK/src/Eccube/Entity/MailTemplate.php
gen -> /tmp/proxy_p7LP43zDTNLK/src/Eccube/Entity/BaseInfo.php
gen -> /tmp/proxy_p7LP43zDTNLK/src/Eccube/Entity/MailTemplate.php
gen -> /tmp/proxy_p7LP43zDTNLK/src/Eccube/Entity/BaseInfo.php
gen -> /tmp/proxy_p7LP43zDTNLK/src/Eccube/Entity/MailTemplate.php
gen -> /tmp/proxy_p7LP43zDTNLK/src/Eccube/Entity/BaseInfo.php

 The following SQL statements will be executed:

     ALTER TABLE dtb_base_info ADD delivery_free_amount_c1 NUMERIC(12, 2) DEFAULT NULL;

 Updating database schema...

     1 query was executed


 [OK] Database schema updated successfully!