diff --git a/.github/workflows/squad-ci.yml b/.github/workflows/squad-ci.yml
index 42a433b..7684856 100644
--- a/.github/workflows/squad-ci.yml
+++ b/.github/workflows/squad-ci.yml
@@ -19,10 +19,6 @@ jobs:
 
       - name: Build and test
         run: |
-          # TODO: Add your dotnet build/test commands here
-          # Go:            go test ./...
-          # Python:        pip install -r requirements.txt && pytest
-          # .NET:          dotnet test
-          # Java (Maven):  mvn test
-          # Java (Gradle): ./gradlew test
-          echo "No build commands configured — update squad-ci.yml"
+          dotnet restore
+          dotnet build --no-restore --configuration Release
+          dotnet test --no-build --configuration Release
diff --git a/src/Api/Data/IssueRepository.cs b/src/Api/Data/IssueRepository.cs
index 69740dc..45c16bd 100644
--- a/src/Api/Data/IssueRepository.cs
+++ b/src/Api/Data/IssueRepository.cs
@@ -138,6 +138,8 @@ internal class IssueEntity
 	[BsonElement("updatedAt")]
 	public DateTime UpdatedAt { get; set; }
 	public bool IsArchived { get; set; }
+	public string? ArchivedBy { get; set; }
+	public DateTime? ArchivedAt { get; set; }
 	public List<LabelEntity>? Labels { get; set; }
 
 	public static IssueEntity FromDomain(Issue issue)
diff --git a/src/Api/Program.cs b/src/Api/Program.cs
index f326659..266e4d0 100644
--- a/src/Api/Program.cs
+++ b/src/Api/Program.cs
@@ -34,6 +34,24 @@
 
 var app = builder.Build();
 
+app.UseExceptionHandler(errorApp => errorApp.Run(async context =>
+{
+	var ex = context.Features.Get<Microsoft.AspNetCore.Diagnostics.IExceptionHandlerFeature>()?.Error;
+	if (ex is FluentValidation.ValidationException validationEx)
+	{
+		context.Response.StatusCode = StatusCodes.Status400BadRequest;
+		context.Response.ContentType = "application/problem+json";
+		var errors = validationEx.Errors
+			.GroupBy(e => e.PropertyName)
+			.ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+		await context.Response.WriteAsJsonAsync(new { title = "Validation failed", errors });
+	}
+	else
+	{
+		context.Response.StatusCode = StatusCodes.Status500InternalServerError;
+	}
+}));
+
 app.UseHttpsRedirection();
 app.MapOpenApi();
 
diff --git a/src/Shared/Domain/Issue.cs b/src/Shared/Domain/Issue.cs
index 6ab2001..2c1e70f 100644
--- a/src/Shared/Domain/Issue.cs
+++ b/src/Shared/Domain/Issue.cs
@@ -102,17 +102,17 @@ public Issue Update(string title, string? description)
 	}
 
 	/// <summary>
-	/// Gets or sets a value indicating whether the issue is archived (soft-deleted).
+	/// Gets a value indicating whether the issue is archived (soft-deleted).
 	/// </summary>
-	public bool IsArchived { get; set; } = false;
+	public bool IsArchived { get; init; } = false;
 
 	/// <summary>
-	/// Gets or sets the user who archived the issue.
+	/// Gets the user who archived the issue.
 	/// </summary>
-	public string? ArchivedBy { get; set; }
+	public string? ArchivedBy { get; init; }
 
 	/// <summary>
-	/// Gets or sets the timestamp when the issue was archived.
+	/// Gets the timestamp when the issue was archived.
 	/// </summary>
-	public DateTime? ArchivedAt { get; set; }
+	public DateTime? ArchivedAt { get; init; }
 }
diff --git a/tests/Unit/Validators/ListIssuesQueryValidatorTests.cs b/tests/Unit/Validators/ListIssuesQueryValidatorTests.cs
index 8e32400..92512fa 100644
--- a/tests/Unit/Validators/ListIssuesQueryValidatorTests.cs
+++ b/tests/Unit/Validators/ListIssuesQueryValidatorTests.cs
@@ -62,7 +62,7 @@ public void ListIssuesQueryValidator_PageZero_ReturnsValidationError()
 		result.IsValid.Should().BeFalse();
 		result.Errors.Should().HaveCount(1);
 		result.Errors[0].PropertyName.Should().Be("Page");
-		result.Errors[0].ErrorMessage.Should().Contain("greater than 0");
+		result.Errors[0].ErrorMessage.Should().Contain("greater than or equal to 1");
 	}
 
 	[Fact]
@@ -100,7 +100,7 @@ public void ListIssuesQueryValidator_PageSizeZero_ReturnsValidationError()
 		result.IsValid.Should().BeFalse();
 		result.Errors.Should().HaveCount(1);
 		result.Errors[0].PropertyName.Should().Be("PageSize");
-		result.Errors[0].ErrorMessage.Should().Contain("greater than 0");
+		result.Errors[0].ErrorMessage.Should().Contain("between 1 and 100");
 	}
 
 	[Fact]