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The shell's version cards (shell/node-versions-source.ts): - a version's change and undo target are the state it replaced, the History entry right before its first copy, not the card before it: after a restore those differ, and undo went to the wrong version (and not where restore_version steps_back=1 goes) - a card restores the newest copy of its content, as restore_version does, so page settings the user changed (a "user" copy) are kept - a blank page after a drawing is a clear of the canvas, a version of its own; only the blank page before any drawing is hidden - numbers and changes are keyed by content, not by the first copy's id, so a version keeps them when its first copy drops out of the server's 20-entry buffer; the caches start over for another server state (the process restarted: entry ids name other content) The server's History (src/history.ts): - firstCopyIds compares each entry with the first of every group only: a bare model matches any page name, so "same content" is not transitive, and a card could show one document and restore another - the time and pages fields had no reader; pages parsed every XML once more on every write Reading History (src/http-server.ts, shell/mcp-sync-core.ts): - GET /api/state and a push's answer carry a History key (entry count, newest id, the entry on the canvas); the shell reads History again only when it changes, so a hand edit no longer downloads every entry's XML and thumbnail - a failed History read is told again at the next poll - a History list from a state the poll has not seen yet is dropped