Add App.

app/ChatMasterMind/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

app/ChatMasterMind/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

app/ChatMasterMind/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

app/ChatMasterMind/ChatData.swift

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+//
+//  Item.swift
+//  ChatMasterMind
+//
+//  Created by Oleksandr Kozachuk on 2023-06-24.
+//
+
+import Foundation
+import SwiftData
+
+@Model
+final class ChatPair: Identifiable {
+    let id: UUID
+    var timestamp: Date
+    var question: String
+    var answer: String?
+    var previousVersions: [ChatPair]
+    
+    init(question: String, answer: String? = nil, timestamp: Date = Date(), previousVersions: [ChatPair] = []) {
+        self.id = UUID()
+        self.question = question
+        self.answer = answer
+        self.timestamp = timestamp
+        self.previousVersions = previousVersions
+    }
+}
+
+@Model
+final class ChatHistory: Identifiable {
+    let id: UUID
+    var name: String
+    var chatPairs: [ChatPair]
+    
+    init(name: String, chatPairs: [ChatPair] = []) {
+        self.id = UUID()
+        self.name = name
+        self.chatPairs = chatPairs
+    }
+    
+    func addChatPair(question: String, answer: String? = nil, timestamp: Date = Date()) {
+        let newPair = ChatPair(question: question, answer: answer, timestamp: timestamp)
+        chatPairs.append(newPair)
+    }
+    
+    func editChatPair(withId id: UUID, question: String? = nil, answer: String? = nil) {
+        guard let index = chatPairs.firstIndex(where: { $0.id == id }) else { return }
+        let newChatPair = chatPairs[index]
+        newChatPair.previousVersions.append(chatPairs[index])
+        if let question = question {
+            newChatPair.question = question
+        }
+        if let answer = answer {
+            newChatPair.answer = answer
+        }
+        newChatPair.timestamp = Date()
+        chatPairs[index] = newChatPair
+    }
+}

app/ChatMasterMind/ChatMasterMind.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>aps-environment</key>
+	<string>development</string>
+	<key>com.apple.developer.aps-environment</key>
+	<string>development</string>
+	<key>com.apple.developer.icloud-container-identifiers</key>
+	<array/>
+	<key>com.apple.developer.icloud-services</key>
+	<array>
+		<string>CloudKit</string>
+	</array>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+</dict>
+</plist>

app/ChatMasterMind/ChatMasterMindApp.swift

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+//
+//  ChatMasterMindApp.swift
+//  ChatMasterMind
+//
+//  Created by Oleksandr Kozachuk on 2023-06-24.
+//
+
+import SwiftUI
+import SwiftData
+
+@main
+struct ChatMasterMindApp: App {
+
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+        .modelContainer(for: ChatHistory.self)
+    }
+}

app/ChatMasterMind/ContentView.swift

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+//
+//  ContentView.swift
+//  ChatMasterMind
+//
+//  Created by Oleksandr Kozachuk on 2023-06-24.
+//
+
+import SwiftUI
+import SwiftData
+import MarkdownView
+
+struct ContentView: View {
+    @Environment(\.modelContext) private var modelContext
+    @Query private var chatHistoryList: [ChatHistory]
+    
+    var body: some View {
+        NavigationView {
+            List {
+                ForEach(chatHistoryList) { chatHistory in
+                    NavigationLink(destination: ChatHistoryDetailView(chatHistory: chatHistory)) {
+                        Text(chatHistory.name)
+                    }
+                }
+                .onDelete(perform: deleteItems)
+            }
+            .toolbar {
+#if os(iOS)
+                ToolbarItem(placement: .navigationBarTrailing) {
+                    EditButton()
+                }
+#endif
+                ToolbarItem {
+                    Button(action: newChat) {
+                        Label("New chat", systemImage: "plus")
+                    }
+                }
+            }
+            Text("Select an chat")
+        }
+    }
+
+    private func newChat() {
+        withAnimation {
+            let newChatHistory = ChatHistory(name: "test1")
+            modelContext.insert(newChatHistory)
+        }
+    }
+
+    private func deleteItems(offsets: IndexSet) {
+        withAnimation {
+            for index in offsets {
+                modelContext.delete(chatHistoryList[index])
+            }
+        }
+    }
+}
+
+struct ChatHistoryDetailView: View {
+    @Environment(\.modelContext) private var modelContext
+    var chatHistory: ChatHistory
+    @State private var newQuestion: String = ""
+    @State private var pairToEdit: ChatPair? = nil
+    @State private var newAnswer: String = ""
+
+    var body: some View {
+        VStack {
+            List {
+                ForEach(chatHistory.chatPairs) { chatPair in
+                    VStack(alignment: .leading) {
+                        MarkdownView(text: chatPair.question)
+                        if let answer = chatPair.answer {
+                            MarkdownView(text: answer)
+                                .tint(.secondary)
+                        }
+                        Button(action: {
+                            pairToEdit = chatPair
+                            newAnswer = chatPair.answer ?? ""
+                        }) {
+                            Text("Edit")
+                                .foregroundColor(.blue)
+                        }
+                    }
+                    Text("Timestamp: \(chatPair.timestamp)")
+                        .foregroundColor(.secondary)
+                        .font(.footnote)
+                }
+            }
+            HStack {
+                TextEditor(text: $newQuestion)
+                    .frame(height: 100)
+                    .overlay(RoundedRectangle(cornerRadius: 5).stroke(Color.gray))
+                Button(action: {
+                    addChatPair()
+                }) {
+                    Text("Add")
+                }
+                Button(action: {
+                    cancelEdit()
+                }) {
+                    Text("Cancel")
+                }
+            }
+            .padding()
+        }
+        .navigationTitle(chatHistory.name)
+        .sheet(item: $pairToEdit) { pairToEdit in
+            VStack {
+                Text(pairToEdit.question)
+                TextEditor(text: $newAnswer)
+                    .overlay(RoundedRectangle(cornerRadius: 5).stroke(Color.gray))
+                    .frame(maxHeight: .infinity)
+                Button(action: {
+                    editChatPair(pairToEdit)
+                }) {
+                    Text("Save")
+                }
+            }
+            .padding()
+        }
+    }
+    
+    private func addChatPair() {
+        guard !newQuestion.isEmpty else { return }
+        withAnimation {
+            let newPair = ChatPair(question: newQuestion)
+            chatHistory.chatPairs.append(newPair)
+            newQuestion = ""
+            do {
+                try modelContext.save()
+            } catch {
+                print("Error saving model context: \(error)")
+            }
+        }
+    }
+
+    private func editChatPair(_ chatPair: ChatPair) {
+        guard !newAnswer.isEmpty else { return }
+        withAnimation {
+            chatHistory.editChatPair(withId: chatPair.id, question: nil, answer: newAnswer)
+            newAnswer = ""
+            pairToEdit = nil
+            do {
+                try modelContext.save()
+            } catch {
+                print("Error saving model context: \(error)")
+            }
+        }
+    }
+    
+    private func cancelEdit() {
+        newAnswer = ""
+        pairToEdit = nil
+    }
+}
+
+#Preview {
+    ContentView()
+        .modelContainer(for: ChatHistory.self, inMemory: true)
+}

app/ChatMasterMind/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>remote-notification</string>
+	</array>
+</dict>
+</plist>

app/ChatMasterMind/Preview Content/Preview Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}