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With QET_LAZY_FOLIOS=1, a project opened from a .qetz's index saves a .qetz without building the folios it never built, when building them would write the same: their parts are copied as they were and their rows of the document's engineering data from the project.sqlite they were read from (QetContainerDb::extract() with kept_from, QetContainer::split() with the old entries, pictures included). Whether a folio may be kept follows the rules of stage 5.5 (QETProject::toXml() with kept_parts): nothing project-wide changed since opening; a folio whose own data changed is built with its partners; after an edit, folios holding a table filled from the database are built; the partners still waiting of every built folio are built. Trusted only for a project opened from a format 3 index written by this version whose folios are named by their uuid. Format 3 names a folio by its uuid in the database (doc_meta folio_ids = uuid) when every folio has one of its own, so that a kept folio keeps its rows whatever its place; copies keep the rows' order (ORDER BY rowid). A folio not built keeps the name of its part until it is built (Diagram::deferredPart()). Measured, the 136-folio f2099 opened from its .qetz and saved as a .qetz: 4.75 s with no folio built, 33 s with every folio built; its 136 folio parts copied byte for byte; a kept save of a kept save is the same bytes. industrial.qetz untouched: 28 of its 47 folios not built are built to save (link chains, as in 5.5); after everyday edits on its busiest folio, 7 stay not built. tst_lazyfolios: an untouched .qetz saved without building, read back, holds the project; edits saved without building hold, read back, what the same edits saved with every folio built hold (read back too: a wire numbered from its potential is saved with no sequential numbers whichever the way -- reading it back renumbers it, a separate issue); fails when a kept folio's symbol information is not copied. Corpus, 342 projects: a .qetz saved without building, read and saved as .qet = eager = master on all 342. ctest 96/96 with and without QET_LAZY_FOLIOS=1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>