This is the final part of the series. In Part 1 and Part 2, the focus was mostly on the UI layer. In this part, the missing backend pieces come together: database models, CRUD handlers, parameter binding, shared services, and response handling. As in the previous articles, the examples below are intentionally simplified. They are based on the structure of this codebase, but they are written as tutorial-style pseudocode so the main ideas stay easy to follow. GORM Generic Interface This project uses GORM's generic API, which keeps queries type-safe and makes it easier to see which model is being queried. For example, a product model can be declared like this: type Product struct { gorm . Model Name string `gorm:"not null"` Description string `gorm:"not null"` Brand string `gorm:"not null"` Category string `gorm:"not null"` Skus [] Sku `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE"` } Enter fullscreen mode Exit fullscreen mode Then queries can be written with gorm.G[T] : func getProductByID ( c fiber .…