Add additional oil to the pot, if needed, and add the onion, bell pepper and celery. Cook, stirring occasionally, for about 2 minutes and then add the garlic. Cook, stirring for 1 minute, or until the veggies are tender and then stir in the tomato sauce, Cajun seasoning, Italian seasoning, red beans, chicken broth, hot sauce, bay leaves, sausage, and freshly ground black pepper, to taste. Increase the heat under the pot and bring the mixture to a boil, cover, reduce heat and simmer for 10 minutes. Uncover and stir the mixture then continue to simmer, uncovered, an additional 10 minutes, or until slightly thickened.