ws_giftdropdown/config/services.yml

imports:
    - { resource: command.yml }

services:
    websmid.giftdropdown.entity.table_prefix_subscriber:
        class: 'Websmid\GiftDropdown\Entity\TablePrefixSubscriber'
        arguments:
            - "%database_prefix%"
        tags:
            - { name: doctrine.event_subscriber }