I have a weird problem. When I run doctrine-migrations migrations:diff it regenerates the index that already is set in an earlier migration.
Earlier migration (the uniq index is also present in my database):
$this->addSql('CREATE TABLE my_table (id INT AUTO_INCREMENT NOT NULL, email VARCHAR(255) NOT NULL, UNIQUE INDEX UNIQ_4VBV083VA6917B55 (email), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE `utf8_unicode_ci` ENGINE = InnoDB');
Regenerated after running doctrine-migrations migrations:diff:
$this->addSql('DROP INDEX uniq_4vbv083va6917b55 ON my_table');
$this->addSql('CREATE UNIQUE INDEX UNIQ_J43107ECE6416I64 ON contact_company (email)');
Notice the lowercase to uppercase. Maybe that means something. In my earlier migration I have it uppercase and it's also appear upper in my database, so I don't know why it is lowercase here.
I've defined the unique constraint like this in my entity:
/**
* @ORM\Column(type="string", unique=true)
*/
private string $email;