package main

// Login validates user credentials.
func Login(user, pass string) (*Token, error) {
    return nil, nil
}

// GetUser retrieves a user by ID.
func (s *Service) GetUser(id string) (*User, error) {
    return nil, nil
}

// User represents a user entity.
type User struct {
    ID   string
    Name string
}

// Service handles user operations.
type Service struct {
    db *Database
}

// Token represents an authentication token.
type Token struct {
    Value string
}

// const MaxRetries defines maximum login attempts.
const MaxRetries = 3