Notifications in SwiftUI

I have a reminder app that contains a list of items with anniversary dates. The application is written in SwiftUI. I want to know what the best way is to manage notifications on the anniversary dates.

If I have 5 items in my list, each with their own different anniversary date, I want to allow the user to select a time for notifications (and day of, or day before notifications). The user can therefore select to be notified at 9 AM on the date of the anniversary.

The user will specify the reminder time on the settings page. I will then create notifications for each date in the list to trigger at the time the user selected.

My questions are as follows:

• Must I loop through the list and create a notification using UNUserNotificationCenter for each item recursively? The list might get big, but I don't see a way to create notifications for each item in the list without looping through it and creating a notification for each.... but is this the right way to do it?
• I was thinking of creating an @ObservableObject that I can populate a @Published property of array for all the anniversary dates and items. I can then pick this up somewhere else in my app when I want to create the notifications for each item.
• Each notification will be created with identifier: UUID().uuidString. But I will probably have to keep track of the item and the UUID used to create the notification... what if the specific notification needs to be cancelled using the removePendingNotificationRequests(withIdentifiers:) method of UNUserNotificationCenter. To do this, I need to know the UUID of the item to cancel?
• Lastly, what if one or more anniversary dates change? The created notifications will no longer be valid. How would be the best way to manage this?

Perhaps I am looking at the whole situation incorrectly? I'm not sure. I'm a C# developer, writing a SwiftUI app for the first time. Some of the concepts are a bit foreign to me, so forgive me if some of the terminology I use is incorrect.