* perf(stats): split stats endpoint per-section and rewrite GetGlobalStats
Stats page used to wait on a single endpoint that ran 7 SQL queries in parallel
and rendered nothing until the slowest one returned. Cold first-paint was the
bottleneck users actually hit.
- Backend: split /api/v1/workspaces/:id/stats into 7 per-section endpoints
(global, tasks, daily-activity, completed-activity, agent-usage,
repositories, git). Each handler runs one repo call and returns its DTO.
- Backend: rewrote GetGlobalStats from 9 independent correlated subqueries
into 4 CTEs (task / session / turn / message). Each underlying table is now
scanned at most once per request instead of 1-3 times.
- Frontend: replaced the monolithic fetchStats + single PanelState with
useStatsSections hook (7 parallel fetches, per-section SectionStatus).
Each panel renders skeleton -> data -> error independently; light queries
(overview, agent usage, git) paint immediately, heavy ones stream in.
- Tests: added TestGetGlobalStats_AggregatesAcrossTables to lock the
CTE-based query against regressions for turns, user/tool messages, and
total duration.
* fix(stats): address PR review feedback
- Restore cache: "no-store" on section fetches; Gin emits no Cache-Control
headers so the browser could otherwise serve stale stats on revisit
(Greptile P1, Cubic).
- Stop blanking the Overview panel when /git fails: render OverviewCards as
soon as `global` is ready and treat `git` as optional, falling back to the
Averages card. Updates GitOrAveragesCard / OverviewCards types (Claude).
- Fix TaskStatsHasMore off-by-one at exactly taskStatsLimit rows: probe
taskStatsLimit+1, slice back to the page size, only flag hasMore on a
confirmed extra row (Claude, Cubic).
- Rename anyError → firstError with a comment documenting the deterministic
insertion-order iteration; clearer signal that callers should use it as
"any section failed?" and surface per-section errors in their own panels
(Claude).
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Co-authored-by: Kandev Agent <agent@kandev.dev>
João Salavisa
31d4ba67fa