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A .qetz now carries index.sqlite: the project database as QElectroTech keeps it -- every table but the drawing items, which exist for built folios only -- with each folio's own data (Diagram::headerXml()) and a stamp of the schema it was written with (projectDataBase::indexFile(), QETProject::writeContainerFile(): Save, --resave, --set-titleblock, a script's and live mode's save). Written when every folio, symbol and wire has a uuid of its own; a reader that does not know the entry skips it. With QET_LAZY_FOLIOS=1, a .qetz with an index opens from it: the project document is joined without its folios (QetContainer::join() with folio_files), the database and the stores of symbol information and wire properties are filled from the index (fillFromIndex()), each folio is made from its own data and keeps the name of its part, read when the folio is built (Diagram::deferredXml(), QETProject::readFolioPart(), QetContainer::readFolio() -- pictures and engineering data back from project.sqlite, QetContainerDb::restoreFolio()). A terminal strip finds its terminals' folios in the database. Any other .qetz, or one whose index cannot be used, is read whole as before. The index is untrusted: refused unless written with this database's schema, every table read a plain table (not a view), nothing in its schema run (trusted_schema off); refused, the project is read whole. Checked: an index of garbage, a wrong stamp, a table made a view -- each refused and the project saved as a plain save. The 136-folio f2099 as .qetz opens in 1.8 s (3.65 s read whole, 29 s building every folio); what is left is mostly its 7 MB of symbol definitions (0.8 s). The file grows from 2.6 to 5.2 MB, the index overlapping project.sqlite until D3. tst_lazyfolios: a .qetz opened from its index builds only the terminal strip's folios, numbering read as when built, every folio shown in turn draws and links as when built, the save as when built; fails when a folio part's engineering data is not put back. Corpus, 342 projects: 340 .qetz carry an index and open from it (2 have symbols sharing a uuid); saved back as .qet = eager = master on all 342. Probe on industrial and f2099 .qetz: every folio as eager but the 3 render-noise folios of f2099. In a real window the .qetz opens and pages building only shown folios and partners. ctest 96/96 with and without QET_LAZY_FOLIOS=1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>