Add UNSIGNED

Author: fogelito

src/Database/Adapter/MariaDB.php

@@ -185,7 +185,7 @@ public function createCollection(string $name, array $attributes = [], array $in
 
         $permissions = "
             CREATE TABLE {$this->getSQLTable($id . '_perms')} (
-                _id BIGINT NOT NULL AUTO_INCREMENT,
+                _id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
                 _type VARCHAR(12) NOT NULL,
                 _permission VARCHAR(255) NOT NULL,
                 _document VARCHAR(255) NOT NULL,