Whatever your current db platform, all db objects will need to be migrated to Postgresql db as that is the db platform Pegacloud runs on. Yes, our recommendation is always try not to bring any client unique artifacts into the Pegacloud environment as it is hard to manage and could be operationally challenging, especially upgrade. You should think hard if those custom DB objects are needed or not before migration. Think of alternatives such as achieving the same goals through Pega platform features instead of directly manipulating db objects. Obviously this is case by case analysis.