POST /workspaces/{ws}/items/{ref}/patch {edits:[{old,new,line_hint?}],
expected_seq?} replaces exact text in the body. It runs through updateItem,
so it takes every PATCH guard; the body is computed inside the store
transaction from the row it replaces. Each old must occur exactly once;
edits apply in order, all or nothing; every patch writes a version. The
answer carries a unified diff of what changed.
expected_seq does not refuse: a moved seq is applied over when the
anchors still match, and answered rebased with the intervening writes,
read from a seq chain stamped into item activity entries ({prev_seq, seq,
version_id}). complete is decided at runtime, so any write that left no
stamp reads incomplete; a guard test classifies every seq-moving store
statement. Refusals write nothing: patch_anchor_missing,
patch_anchor_ambiguous, patch_room_open (an open editor; step 2).
CLI: pad item patch, pad item show --lines. MCP 0.87 (additive):
pad_item.patch, get lines, three allow-listed codes. The timeline treats
the chain and patch keys as bookkeeping, not a change.
Claude-Session: https://claude.ai/code/session_01Q9WssCjFuHjSfLABoW4tmS
* feat(history): version rows carry their writer, line counts and create marker; a diff endpoint pairs each row with its own change (PLAN-2348 U2)
* test(history): server legs, export/import leg; web type and API method for the version diff (PLAN-2348 U2)
* docs(history): the version diff endpoint and row fields in CLAUDE.md; FormatDiffSummary names what it counts (PLAN-2348 U2)
* fix(history): user_id already existed on item_versions (migration 012); a diff refuses a body the chain could not rebuild (PLAN-2348 U2, codex r1)
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Single Go binary with embedded SvelteKit web UI, SQLite storage,
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