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__PACKAGE__->table("classification_rules");
__PACKAGE__->add_columns(
...

__PACKAGE__->set_primary_key("id");
__PACKAGE__->add_unique_constraint( ['path'] );

CREATE TABLE `classification_rules` (
  `id` integer NOT NULL auto_increment,
...
  PRIMARY KEY (`id`),
  UNIQUE `classification_rules_path` (`path`)
) ENGINE=InnoDB;