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xarmian
974472799a
* feat(api): wire real workspace seq into /items-index cursor + rows (TASK-1353)
Replaces the placeholder `updated_at`-derived cursor on the
/items-index response with the real workspace-scoped MAX(seq)
introduced by TASK-1352. Each returned row carries its own `seq`
field so clients can reason about ordering without parsing the
cursor.
When the requested scope returns zero rows but the workspace has
items (e.g. ?collection=docs on a workspace whose docs collection
is empty but whose tasks/ideas are not), the cursor falls back to
the workspace's true MAX(seq) via a new Store.MaxItemSeq helper.
That way the client's next /items-changes?since=cursor poll starts
at the right floor instead of replaying every prior mutation from 0.
Empty workspaces collapse to "0".
Encoding: cursor is the decimal-encoded MAX(seq). Treated as opaque
on the wire (clients re-pass it as ?since=). String form leaves
room to switch to base32/etc later without an API break.
TypeScript: `ItemIndexRow` (via `Item`) adds optional `seq?: number`;
`ItemIndexResponse.cursor` docstring updated to reflect the real
seq cursor semantics. `api.items.listIndex` docstring updated.
Tests:
- TestListItemsIndex_SkinnyProjectionAndShape: cursor now asserts
decimal-encoded MAX(seq); per-row seq is non-zero.
- TestListItemsIndex_EmptyResultFallsBackToWorkspaceMax: new test
covering the cursor fallback on filtered-but-empty results.
- TestListItemsIndex_CursorMonotonicAcrossMutations: new test
confirming cursor advances after every mutation.
Parent: PLAN-1343. Depends on TASK-1352 (seq column). Unblocks
TASK-1354 (/items-changes endpoint).
* fix(api): snapshot workspace MAX(seq) before list to close cursor race per Codex review (round 1)
Codex round 1 caught a real race in /items-index cursor computation:
ListItemsIndex ran first, then MaxItemSeq ran in a separate query.
A concurrent INSERT visible to a future /items-changes call could
land between them — the response would be `items: []` with cursor =
the new seq, and a subsequent /items-changes?since=cursor poll
(seq > cursor) would never return that row.
Fix: capture MaxItemSeq BEFORE the list query. Per the workspace's
monotonic counter invariant (TASK-1352) any insert after that
snapshot has seq > captured M, so /items-changes?since=M will see
it. Rows the list DOES observe may have seq > M (a concurrent
insert the list query happened to commit-snapshot); MAX(rows.seq)
bumps the cursor for that case so the client never re-fetches what
was already in the response.
Long-form comment on the handler captures the race scenario and the
invariant that makes the snapshot order safe.