Embed another page's LIVE content into a host page (it updates when the source
changes, not a static copy). A page can be flagged a template for discovery in
the picker; any accessible page can be embedded.
Server:
- migrations: pages.is_template (+ partial index) and page_template_references
(whole-page back-refs); db.d.ts/entity types hand-merged (db.d.ts is curated).
- POST /pages/toggle-template (CASL Edit) flips is_template; is_template is
returned by findById + the sidebar tree select so the tree menu label
reflects state. Search suggestions gain an onlyTemplates filter for the picker.
- POST /pages/template/lookup ({sourcePageIds[]}, <=50): returns each accessible
source's {title, icon, slugId, content, sourceUpdatedAt} with comment marks
stripped (same access path as transclusion: filterViewerAccessiblePageIds;
inaccessible -> no_access, missing -> not_found; error path -> not_found, never
raw content).
- reference sync (collectPageEmbedsFromPmJson + syncPageTemplateReferences) on
the Yjs save hook; duplicatePage remaps pageEmbed.sourcePageId + inserts refs.
Known MVP gap: REST content updates don't resync refs (lookup uses in-doc ids).
Client:
- pageEmbed node (editor-ext, registered in BOTH client + server schemas);
read-only NodeView with a batching lookup; '/Embed page' slash + template
picker (self-embed prevented); 'Make/Unset template' in the tree node menu.
- Cycle guard: an ancestry-chain context + depth cap (5) render a 'circular
embed' placeholder instead of recursing.
- Public shares show a placeholder (no public lookup in MVP).
MVP excludes (follow-ups): public-share lookup, unsync->static copy, server-side
expansion for export/RAG, MCP schema mirror, point-in-time snapshots.
Implements docs/page-templates-plan.md (MVP, variant A).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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