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A .qetz held the engineering data twice: the document's tables, and beside them QElectroTech's own project database (stage D2/D3), which QElectroTech also builds from the document. Two copies of one fact can disagree, and the copy cost a third of the file. Now project.sqlite holds the document's tables only; QElectroTech builds its own project database from them when the project opens, as it does for a .qet. Measured (this build, lazy folios): industrial (50 folios): 620 -> 374 KB, open 0.37 -> 0.65 s f2099/nuri (136 folios): 3.27 -> 2.20 MB, open 2.2 -> 3.5 s The same projects as .qet open in 3.3 s and 23 s. Saving still copies the file of every folio not built, with its rows (stage D4): the project keeps the part each folio was read from. nuri opened and saved again: 6.3 s, no folio built, the same bytes. A symbol's terminal list is left out of the folio file when every folio, symbol and wire has a uuid of its own, now checked on the document (QetContainer::ownUuids()) rather than by the stored database being written. Checked: 342 corpus projects open, .qetz -> .qet equals the plain resave, a .qetz saved twice gives the same bytes; tst_lazyfolios, tst_qetcontainer, tst_resaveunchanged (which now checks project.sqlite holds only the document's tables). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>