First commit. Include junk from template to remove

src/Application/TodoLists/Commands/CreateTodoList/CreateTodoList.cs

@@ -0,0 +1,32 @@
+using Hutopy.Application.Common.Interfaces;
+using Hutopy.Domain.Entities;
+
+namespace Hutopy.Application.TodoLists.Commands.CreateTodoList;
+
+public record CreateTodoListCommand : IRequest<int>
+{
+    public string? Title { get; init; }
+}
+
+public class CreateTodoListCommandHandler : IRequestHandler<CreateTodoListCommand, int>
+{
+    private readonly IApplicationDbContext _context;
+
+    public CreateTodoListCommandHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<int> Handle(CreateTodoListCommand request, CancellationToken cancellationToken)
+    {
+        var entity = new TodoList();
+
+        entity.Title = request.Title;
+
+        _context.TodoLists.Add(entity);
+
+        await _context.SaveChangesAsync(cancellationToken);
+
+        return entity.Id;
+    }
+}

src/Application/TodoLists/Commands/CreateTodoList/CreateTodoListCommandValidator.cs

@@ -0,0 +1,26 @@
+using Hutopy.Application.Common.Interfaces;
+
+namespace Hutopy.Application.TodoLists.Commands.CreateTodoList;
+
+public class CreateTodoListCommandValidator : AbstractValidator<CreateTodoListCommand>
+{
+    private readonly IApplicationDbContext _context;
+
+    public CreateTodoListCommandValidator(IApplicationDbContext context)
+    {
+        _context = context;
+
+        RuleFor(v => v.Title)
+            .NotEmpty()
+            .MaximumLength(200)
+            .MustAsync(BeUniqueTitle)
+                .WithMessage("'{PropertyName}' must be unique.")
+                .WithErrorCode("Unique");
+    }
+
+    public async Task<bool> BeUniqueTitle(string title, CancellationToken cancellationToken)
+    {
+        return await _context.TodoLists
+            .AllAsync(l => l.Title != title, cancellationToken);
+    }
+}