CREATE TABLE Users (
    Id INT IDENTITY(1,1) PRIMARY KEY,
    Username NVARCHAR(50) NOT NULL UNIQUE,
    PasswordHash NVARCHAR(255) NOT NULL,
    Email NVARCHAR(100) NOT NULL UNIQUE,
    NombreCompleto NVARCHAR(100) NOT NULL,
    FechaCreacion DATETIME NOT NULL DEFAULT GETDATE()
);
