Why doctrine migrations ignore my index declaration? - symfony

Question

I would like to create a table with an indexed columned to speed up searches.
Here is a sample:
#[ORM\Entity(repositoryClass: SettingRepository::class)]
#[ORM\Table(name: '`tr_setting`', indexes: [
new ORM\Index(columns: ['code'], name: 'idx_setting_code')
])]
class Setting
{
#[ORM\Column(type: 'string', length: 15)]
private ?string $code;
#[ORM\Column(type: 'text')]
private string $content;
#[ORM\Id]
#[ORM\GeneratedValue]
#[ORM\Column(type: 'integer')]
private ?int $id;
// Getter and setter...
}
When I use DoctrineBundle migration, the file is generated, but index is ignored...
// ....
final class Version20220719140604 extends AbstractMigration
{
public function up(Schema $schema): void
{
// this up() migration is auto-generated, please modify it to your needs
$this->addSql('CREATE SEQUENCE "tr_setting_id_seq" INCREMENT BY 1 MINVALUE 1 START 1');
$this->addSql('CREATE TABLE "tr_setting" (id INT NOT NULL, code VARCHAR(15) NOT NULL, content TEXT NOT NULL, PRIMARY KEY(id))');
}
For other projects, I already did it with annotations instead of attributes.
I carefully read this answer, but it doesn't help me.
I'm on PHP8.1.8, doctrine/orm 2.12.3 , doctrine-migrations: 3.2, postgresql: 13

Answer 1

My index shall be declared with this syntax:
#[
ORM\Entity(repositoryClass: SettingRepository::class),
ORM\Table(name: '`tr_setting`'),
ORM\Index(columns: ['code'], name: 'idx_setting_code'),
]
or this one:
#[ORM\Entity(repositoryClass: SettingRepository::class)]
#[ORM\Table(name: '`tr_setting`')]
#[ORM\Index(columns: ['code'], name: 'idx_setting_code')]