ASP.NET CORE MINIMAL API SCAFFOLD

1. STARTUP TEMPLATE (Program.cs):
var builder = WebApplicationBuilder.CreateBuilder(args);
builder.Services.AddDbContext<AppDbContext>();
builder.Services.AddScoped<IUserService, UserService>();
var app = builder.Build();
app.MapGet("/users/{id}", GetUserById).WithName("GetUser");
app.MapPost("/users", CreateUser).WithName("CreateUser");
app.Run();

2. DBCONTEXT SETUP:
public class AppDbContext : DbContext {
  public DbSet<User> Users => Set<User>();
  protected override void OnConfiguring(DbContextOptionsBuilder options)
    => options.UseNpgsql(connectionString);
}

3. ASYNC ENDPOINT PATTERN:
async Task<IResult> GetUserById(int id, AppDbContext db) {
  var user = await db.Users.FirstOrDefaultAsync(u => u.Id == id);
  return user != null ? Results.Ok(user) : Results.NotFound();
}

4. ERROR HANDLING MIDDLEWARE:
app.UseExceptionHandler("/error");
app.MapPost("/error", HandleError);

5. DEPENDENCY INJECTION:
builder.Services.AddScoped<IRepository<User>, UserRepository>();

TEST TEMPLATE: xUnit with Moq for repository layer.