Reopen a deal

Reopens a closed trattativa into a named non-terminal stage of its own pipeline. Nothing is undone: a new stage-history row is appended, so the deal’s second run through the funnel is measured separately from its first, and the lost reason is cleared. It refuses a deal that is already open and refuses a won or lost stage. An opportunity that has no forecast date must be given one HERE, as expected_close_date — a closed deal’s figures are locked, so crm_update_deal cannot set it beforehand — and this tool says so rather than failing on a constraint. Reopening is also the way to correct a closed deal’s amount, probability or date: reopen it, then call crm_update_deal.