Web API Add controller with CRUD operations for existing Azure table in Existing Azure db

My app performs Authentication with Asp.NET Identity. The users logging in are stored in dbo.ASPNetUsers

A while ago, I used migrations to add another table called "Customer", but now the table is populated.

How can I add a controller to perform CRUD operations ONLY on existing "Customer"(the other tables have controllers) without dropping the table and risking erasing any of its content or any other content in the existing tables in the db.

What I tried so far:

Create class in Models folder called "Customer" to resemble the table columns

       public class Customer
       {
            [Key]
            public string ID {get;set;}

            public string FirstName {get;set;}

            public string LastName  {get;set;}
       }

Add DbSetCustomers

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext()
           // : base("DefaultConnection", throwIfV1Schema: false)
              : base("MS_TableConnectionString", throwIfV1Schema: false)
        {
        }

        public DbSet<Customer> Customers { get; set; }


        public static ApplicationDbContext Create()
        {
            return new ApplicationDbContext();
        }
    }
}

Add new Controller of type Web API 2 Controller with actions using Entity Framework using model class Customer, with data context class as the default ApplicationDBContext (default option when creating controller, im assuming it uses my app connection string for the azure table).

When using the GET customers in POST, I get an error saying the database has changed since last migration, I Imagine this is because adding the DbSet Customers but I do not want to update migration because in the migration code, there is Drop Table command.

1. Is this right method?
2. Should I just change the migration script not to drop the table?

Please advise.