Defined the Todo model in the app target.

App/Sources/App/TodosApp.swift

@@ -5,7 +5,7 @@ import SwiftUI
 struct TodosApp: App {
     var sharedModelContainer: ModelContainer = {
         let schema = Schema([
-            Item.self
+            Todo.self
         ])
         let modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false)
 

App/Sources/Models/Item.swift

@@ -1,11 +0,0 @@
-import Foundation
-import SwiftData
-
-@Model
-final class Item {
-    var timestamp: Date
-
-    init(timestamp: Date) {
-        self.timestamp = timestamp
-    }
-}

App/Sources/Models/Todo.swift

@@ -0,0 +1,42 @@
+import Foundation
+import SwiftData
+
+/// Represents a todo task created by a user.
+@Model
+final class Todo {
+
+    // MARK: Properties
+
+    /// A date when the todo was completed, if applicable.
+    var completed: Date?
+
+    /// A date by which the todo should be completed.
+    var due: Date
+
+    /// An optional note providing additional details about the todo task.
+    var note: String?
+
+    /// The title of the todo task.
+    var title: String
+
+    // MARK: Initializers
+
+    /// Creates a new todo item.
+    /// - Parameters:
+    ///   - title: The title of the todo item.
+    ///   - note: An optional note providing additional details.
+    ///   - due: The date by which the todo should be completed.
+    ///   - completed: The date when the todo was completed, if applicable.
+    init(
+        title: String,
+        note: String? = nil,
+        due: Date,
+        completed: Date? = nil
+    ) {
+        self.completed = completed
+        self.due = due
+        self.note = note
+        self.title = title
+    }
+
+}

App/Sources/Views/ContentView.swift

@@ -7,7 +7,7 @@ struct ContentView: View {
     private var modelContext
 
     @Query
-    private var items: [Item]
+    private var items: [Todo]
 
     var body: some View {
         NavigationSplitView {
@@ -43,7 +43,7 @@ struct ContentView: View {
 
     private func addItem() {
         withAnimation {
-            let newItem = Item(timestamp: Date())
+            let newItem = Todo(title: "New Todo", due: Date())
             modelContext.insert(newItem)
         }
     }
@@ -59,5 +59,5 @@ struct ContentView: View {
 
 #Preview {
     ContentView()
-        .modelContainer(for: Item.self, inMemory: true)
+        .modelContainer(for: Todo.self, inMemory: true)
 }