# Spec Delta

## Purpose

Garantiza que confirmar una venta actualice ventas e inventario como una sola operación local, evitando datos parciales y errores de IndexedDB.

## ADDED Requirements

### Requirement: Persistencia atómica de venta
The system SHALL persist the sale, sale lines, and inventory movements in one local transaction.

#### Scenario: Venta confirmada
- **GIVEN** an open day and sufficient stock
- **WHEN** user confirms a sale
- **THEN** sale, lines, and negative inventory movement are stored
- **AND** no object store transaction error is raised