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Most symbols stored in older projects have no uuid on their terminals (706 of the 900 in the 24 examples), so a terminal's identity is worked out from where it sits in its symbol on every load (stableUuid()). That is only sound while nothing keyed on it is kept between loads. - On opening a project, every terminal of its embedded symbols without a uuid gets that same derived value (TerminalUuids::fillMissing(), from XmlElementCollection's loading constructor, before any folio is built). The next save writes it, and the wires on it in the form that names terminals by uuid, which QElectroTech reads since 0.8.0. - The recipe moves to TerminalUuids::derived(), which stableUuid() now calls, so the two cannot drift apart. A second terminal at the same point of a symbol gets the next occurrence, and no value is given twice within a symbol. - findTerminal(): a wire whose terminal uuid is not found is matched to the terminal whose derived value it is, so a saved uuid still finds its terminal after the symbol's definition was replaced by one whose terminals carry other uuids. The project database's terminal and conductor tables are identical before and after on all 24 examples except the 3 terminals that share a point with another in their symbol (industrial.qet 1, perceuse.qet 2), which now have an identity of their own. Every example keeps every wire through a resave, and a second save changes nothing. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>