Program.cs

using ChatApp.Data;
using ChatApp.Hubs;

using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddSignalR();

// Adiciona o contexto do banco de dados
builder.Services.AddDbContext<ChatContext>(options =>
    options.UseSqlite("Data Source=./data/chatapp.db"));

var app = builder.Build();

// Verificar e aplicar migrações
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var context = services.GetRequiredService<ChatContext>();
        context.Database.Migrate();
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Erro ao aplicar migrações: {ex.Message}");
    }
}

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    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.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();
app.MapHub<ChatHub>("/chatHub");  // Mapear o Hub para uma rota

app.Run();