Heat 2 tablespoons of canola oil in a wok over high heat. Add the beaten eggs and fry until they are fully cooked. Transfer them to plate. Add the remaining oil, ginger, garlic, carrot, and celery, and stir-fry for 2 minutes. Add the sausage and half of the scallions and cook for 1 minute. Add the cooked rice, soy sauce and rice wine vinegar. Stir-fry until the rice is hot, about 2 minutes. Stir in the reserved eggs and transfer to a serving dish. Garnish with the remaining scallions and serve.