Entities without nullable non-null properties

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Is your feature request related to a problem? Please describe.

Entities for db table abstraction represent one row of a database table. However, they do not reflect that some properties are never null. You can create an instance of an entity class without specifying any value. Not even the primary key is enforced.

$account = new Account();
$account->getId(); // NULL

Describe the solution you'd like

Allow entities to have a constructor with arguments that map directly to object properties.

class Account extends Entity {

	/** @var string */
	protected $userId;

	public function __construct(int $id, string $userId) {
		$this->id = $id;
		$this->userId = $userId;
	}
}

$account = new Account(123, 'admin');
$account->getId(); // Impossible to get NULL here

Describe alternatives you've considered

n/a

Additional context

n/a

@miaulalala as discussed

The issue concerns PHP Entity classes representing database rows, but it names no files, tests, or entry points. Start by locating the Entity abstraction and existing entity construction patterns. Done means entities can accept constructor arguments mapped to their properties so required values, including the primary key, cannot remain null.