A git push to a page with an OPEN editor was silently reverted: the git
commit landed and the DB body updated, but the page in the browser stayed
on the old content and the editor's next autosave overwrote the git change.
Root cause (distributed, not in the merge): writeBody applied the body
merge via collabGateway.openDirectConnection on whichever instance/process
runs git-sync (the api/worker). When an editor is connected to a DIFFERENT
collab instance/process, that opens a SEPARATE, detached Y.Doc. The merge
landed in the detached doc + DB, but the live editor's Y.Doc never received
the Yjs update; its debounced autosave then persisted its STALE state over
the DB, reverting the git change (and, for concurrent edits to different
paragraphs, losing the git side). In one process the bug is invisible
because the direct connection already shares the editor's doc.
Fix: route the body write through the existing custom-event channel (the
same mechanism comment-marks and updatePageContent use) so the merge runs
on the instance that OWNS the live doc. Its update is then broadcast to
every connection (Document.handleUpdate) and the editor's CRDT converges on
the merged result. New CollaborationGateway.writePageBody dispatches to a
new gitSyncWriteBody handler (builds incoming/base docs before opening the
connection — crash-safe — then 3-way/2-way merges into the live fragment);
without redis it runs locally on the single (owning) instance. writeBody
now just forwards the converted ProseMirror bodies + service userId.
Evidence:
- git-ingest-convergence.spec.ts: deterministic two-Y.Doc repro. PATH B
(undelivered update) asserts the LOSS (the bug); PATH A (update delivered,
as the owner-routed write does) asserts the git change SURVIVES and that
concurrent edits to different paragraphs both survive.
- collaboration.handler.git-sync.spec.ts: exercises the real gitSyncWriteBody
against a shared doc wired to a connected "editor" doc (models the
owning-instance broadcast) — editor converges, concurrent edit preserved,
crash-safe on transform failure.
- gitmost-datasource.service.spec.ts: writeBody now routes via writePageBody
(RED before this change — it called openDirectConnection).
Honest scope: the failure is cross-instance; full multi-instance convergence
needs a live Hocuspocus + redis and is not provable in a unit test, so the
convergence invariant is captured at the Yjs update-exchange level.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
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