// Package domain contains pure domain models with no external dependencies.
// These types represent the core business concepts of the service.
package domain

import "errors"

// Domain errors - these are business-level errors that should be translated
// to appropriate HTTP status codes by the handler layer.
var (
	// ErrInvalidUserID indicates the user ID is invalid.
	ErrInvalidUserID = errors.New("invalid user ID")

	// ErrInvalidPreferenceValue indicates one or more preference values are invalid.
	ErrInvalidPreferenceValue = errors.New("invalid preference value")
)