How Do I Define Unique Keys Beyond the Default in Entity Framework Code First?

Defining Unique Keys in Entity Framework Code First

In Entity Framework Code First, models are defined and mapped to database tables. By default, the primary key for each table is a unique integer identifier. However, sometimes you may need to define additional fields as unique keys.

Consider the following Category model:

public class Category
{
    public Guid ID { get; set; }

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