diff --git a/.gitignore b/.gitignore
index 0947b55..f80b957 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ app.db
 app.db-shm
 app.db-wal
 .mono
+logs/
 
 # Node.js dependencies
 node_modules/
diff --git a/src/RazorPagesProject/Data/ApplicationDbContext.cs b/src/RazorPagesProject/Data/ApplicationDbContext.cs
index 8d05fee..e4c2442 100644
--- a/src/RazorPagesProject/Data/ApplicationDbContext.cs
+++ b/src/RazorPagesProject/Data/ApplicationDbContext.cs
@@ -28,12 +28,7 @@ public async virtual Task AddMessageAsync(Message message)
 
     public async virtual Task DeleteAllMessagesAsync()
     {
-        foreach (var message in Messages)
-        {
-            Messages.Remove(message);
-        }
-
-        await SaveChangesAsync();
+        await Messages.ExecuteDeleteAsync();
     }
 
     public async virtual Task DeleteMessageAsync(int id)
diff --git a/src/RazorPagesProject/Pages/GitHubProfile.cshtml.cs b/src/RazorPagesProject/Pages/GitHubProfile.cshtml.cs
index f6b1f6a..cebbeb0 100644
--- a/src/RazorPagesProject/Pages/GitHubProfile.cshtml.cs
+++ b/src/RazorPagesProject/Pages/GitHubProfile.cshtml.cs
@@ -6,9 +6,10 @@
 
 namespace RazorPagesProject.Pages;
 
-public class GitHubProfileModel(IGitHubClient client, IStringLocalizer<GitHubProfileModel> localizer) : PageModel
+public class GitHubProfileModel(IGitHubClient client, IStringLocalizer<GitHubProfileModel> localizer, ILogger<GitHubProfileModel> logger) : PageModel
 {
     private readonly IStringLocalizer<GitHubProfileModel> _localizer = localizer;
+    private readonly ILogger<GitHubProfileModel> _logger = logger;
 
     public class InputModel
     {
@@ -29,7 +30,24 @@ public async Task<IActionResult> OnGetAsync([FromRoute] string userName)
     {
         if (userName != null)
         {
-            GitHubUser = await Client.GetUserAsync(userName);
+            try
+            {
+                GitHubUser = await Client.GetUserAsync(userName);
+            }
+            catch (HttpRequestException ex)
+            {
+                _logger.LogError(ex, "Failed to fetch GitHub profile for user '{UserName}'. Status: {StatusCode}", 
+                    userName, ex.StatusCode);
+                ModelState.AddModelError(string.Empty, _localizer["ErrorFetchingProfile"]);
+                return Page();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Unexpected error occurred while fetching GitHub profile for user '{UserName}'", 
+                    userName);
+                ModelState.AddModelError(string.Empty, _localizer["UnexpectedError"]);
+                return Page();
+            }
         }
 
         return Page();
diff --git a/src/RazorPagesProject/Program.cs b/src/RazorPagesProject/Program.cs
index 46e5e66..a8c3138 100644
--- a/src/RazorPagesProject/Program.cs
+++ b/src/RazorPagesProject/Program.cs
@@ -5,9 +5,18 @@
 using RazorPagesProject.Data;
 using RazorPagesProject.Services;
 using System.Globalization;
+using Serilog;
 
 var builder = WebApplication.CreateBuilder(args);
 
+builder.Host.UseSerilog((context, services, configuration) => configuration
+    .ReadFrom.Configuration(context.Configuration)
+    .ReadFrom.Services(services)
+    .Enrich.FromLogContext()
+    .WriteTo.Console()
+    .WriteTo.File("logs/app-{Date}.txt", rollingInterval: RollingInterval.Day));
+
+
 // Add services to the container.
 var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
 builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlite(connectionString));
@@ -44,7 +53,8 @@
 {
     client.BaseAddress = new Uri("https://api.github.com");
     client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("Yolo", "0.1.0"));
-});
+})
+.AddStandardResilienceHandler();
 
 builder.Services.AddScoped<IQuoteService, QuoteService>();
 
@@ -60,11 +70,11 @@
 else
 {
     app.UseExceptionHandler("/Error");
-    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
     app.UseHsts();
-    app.UseHttpsRedirection();
 }
 
+app.UseHttpsRedirection();
+
 app.UseStaticFiles();
 
 app.UseRequestLocalization();
diff --git a/src/RazorPagesProject/RazorPagesProject.csproj b/src/RazorPagesProject/RazorPagesProject.csproj
index 5735db2..71a1c83 100644
--- a/src/RazorPagesProject/RazorPagesProject.csproj
+++ b/src/RazorPagesProject/RazorPagesProject.csproj
@@ -18,12 +18,12 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.Extensions.Http.Resilience" Version="10.0.0" />
+    <PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
   </ItemGroup>
 
   <!-- The following target is a workaround for https://github.com/dotnet/aspnetcore/issues/59625 -->
-  <Target
-    Name="Workaround_ResolveBuildCompressedStaticWebAssetsConfiguration"
-    BeforeTargets="ResolveBuildCompressedStaticWebAssetsConfiguration">
+  <Target Name="Workaround_ResolveBuildCompressedStaticWebAssetsConfiguration" BeforeTargets="ResolveBuildCompressedStaticWebAssetsConfiguration">
     <!-- Remove any duplicate items from StaticWebAssets -->
 
     <ItemGroup>
diff --git a/src/RazorPagesProject/Resources/Pages/GitHubProfile.en.resx b/src/RazorPagesProject/Resources/Pages/GitHubProfile.en.resx
index 2f4caf2..5eac620 100644
--- a/src/RazorPagesProject/Resources/Pages/GitHubProfile.en.resx
+++ b/src/RazorPagesProject/Resources/Pages/GitHubProfile.en.resx
@@ -106,4 +106,10 @@
   <data name="Language" xml:space="preserve">
     <value>Language</value>
   </data>
+  <data name="ErrorFetchingProfile" xml:space="preserve">
+    <value>Unable to fetch the GitHub profile. Please check the username and try again.</value>
+  </data>
+  <data name="UnexpectedError" xml:space="preserve">
+    <value>An unexpected error occurred. Please try again later.</value>
+  </data>
 </root>
diff --git a/src/RazorPagesProject/Resources/Pages/GitHubProfile.ja.resx b/src/RazorPagesProject/Resources/Pages/GitHubProfile.ja.resx
index 563b27c..55dbc7e 100644
--- a/src/RazorPagesProject/Resources/Pages/GitHubProfile.ja.resx
+++ b/src/RazorPagesProject/Resources/Pages/GitHubProfile.ja.resx
@@ -106,4 +106,10 @@
   <data name="Language" xml:space="preserve">
     <value>言語</value>
   </data>
+  <data name="ErrorFetchingProfile" xml:space="preserve">
+    <value>GitHubプロフィールを取得できませんでした。ユーザー名を確認して、もう一度お試しください。</value>
+  </data>
+  <data name="UnexpectedError" xml:space="preserve">
+    <value>予期しないエラーが発生しました。後でもう一度お試しください。</value>
+  </data>
 </root>