Sale Validity Auto-Cancel

This module adds an automatic cleanup of old quotations. In the Sales settings you get a new field, 'Auto-cancel expired quotations after (days)', where you enter how many days after the quotation's expiration date it should be cancelled. The value must be zero or positive; a database check prevents negative numbers.

A scheduled action named 'Cancel Expired Quotations' runs once a day. It looks at quotations in draft or sent state whose expiration date is older than today minus the configured number of days, and cancels them. The job is created inactive, so an administrator must enable it before it starts running.

On each customer (contact) form, in the Sales section, there is a checkbox 'Auto Cancel Expired SaleOrder', checked by default. If you uncheck it for a customer, that customer's expired quotations are skipped by the automatic cancellation. On the quotation itself, the 'Auto Cancel' flag simply mirrors the customer's setting.

The module touches res.company, res.config.settings, res.partner and sale.order. Cancellation errors are logged rather than stopping the whole run, so one problematic order does not block the others.