Session Date: 2026-03-01
Project: Quality Metrics Dashboard (quality-metrics-dashboard)
Focus: Complete 14 unmitigated DRY backlog items (H1, H4, H5, M3–M6, M8, L1–L6)
Session Type: Implementation & Migration
Executive Summary
Completed comprehensive DRY consolidation backlog from session aaf11fa. Implemented 14 items across HIGH, MEDIUM, and LOW priority tiers, reducing code duplication and improving component reusability across the quality-metrics-dashboard. Key achievements include extracting 5 new reusable components (TruncatedList, Stat, FreqBar, MetadataRow, TruncatedIdLink), creating a generic useApiQuery factory that eliminated ~100+ lines of fetch boilerplate across 11 hooks, consolidating CSS status-color mapping with data-attribute selectors, and completing theme.css token coverage. All changes underwent per-commit code review gates and final full-stack review (score 8/10). Zero critical or high-severity issues; 8 low-priority follow-ups recorded for future sessions.
Key Metrics
| Metric | Value | Notes |
|---|---|---|
| Items Implemented | 14 | H1, H4, H5, M3, M4, M5, M6, M8, L1, L2, L3, L4, L5, L6 |
| Total Commits | 18 | 14 implementation + 4 follow-ups (formatter, migration, migration) |
| Components Created | 5 | TruncatedList, Stat, FreqBar, MetadataRow, TruncatedIdLink |
| Hooks Refactored | 11 | All using new useApiQuery factory |
| Boilerplate Reduced | ~100+ LOC | Fetch + retry + staleTime duplication |
| Test Coverage | 293/293 | 100% pass rate; 17 test files |
| TypeScript | Clean | npx tsc --noEmit zero errors |
| Code Review Score | 8/10 | Final full-stack review; 0 critical, 0 high severity |
| Follow-ups Recorded | 8 items | FR1–FR8 as low-priority backlog items |
Problem Statement
Session aaf11fa identified 14 unmitigated DRY consolidation opportunities across the dashboard:
- HIGH (H1–H5): Status color theming repeated 5+ times with per-component selectors; 10+ hooks with identical fetch/retry/staleTime boilerplate; CompliancePage manually managing loading/error/skeleton while 8 other pages use PageShell.
- MEDIUM (M3–M8): Duplicate table header selectors in theme.css; tooltip styles repeated twice; slice+map+”+N more” pattern appears 3× in SessionDetailPage; Stat and FreqBar defined inline but represent generic components; label-value pair pattern in 4 components.
- LOW (L1–L6): Hardcoded px values where space tokens should apply; inconsistent fade-in durations; incomplete mono utility matrix; gap/margin coverage gaps; identical Recharts config in TrendChart and TrendSeries; Link+truncateId pattern in 3 components.
These items were deferred from session aaf11fa for batch implementation in a follow-up session.
Implementation Details
H1: Data-Attribute Status Theming
File: src/theme.css:239–324
Consolidated 10+ per-component status class rules into 5 data-attribute selector rules with CSS variables for theming:
[data-status="healthy"] { --s-bg: var(--bg-status-healthy); --s-border: var(--border-status-healthy); --s-fg: var(--status-healthy); }
[data-status="warning"] { --s-bg: var(--bg-status-warning); --s-border: var(--border-status-warning); --s-fg: var(--status-warning); }
[data-status="critical"] { --s-bg: var(--bg-status-critical); --s-border: var(--border-status-critical); --s-fg: var(--status-critical); }
[data-status="no_data"] { --s-bg: var(--bg-elevated); --s-border: var(--border); --s-fg: var(--status-no-data); }
[data-status="info"] { --s-bg: var(--bg-elevated); --s-border: var(--border); --s-fg: var(--text-secondary); }
.health-banner[data-status] { background: var(--s-bg); border: 1px solid var(--s-border); }
.status-badge[data-status] { color: var(--s-fg); background: var(--s-bg); }
.alert-item[data-status] { border-left-color: var(--s-fg); }
JSX change — Components now use data-status={status} attribute instead of composing className:
// Before
<span className={`status-badge ${status === 'healthy' ? 'healthy' : status === 'warning' ? 'warning' : 'critical'}`}>
// After
<span className="status-badge" data-status={status}>
Files updated: Indicators.tsx, AlertList.tsx, HealthOverview.tsx, ExecutiveView.tsx, OperatorView.tsx (5 files).
H4: useApiQuery Factory Hook
File: src/hooks/useApiQuery.ts (created)
Extracted generic factory with three-type-parameter signature for React Query:
export function useApiQuery<TRaw, T = TRaw>(
queryKey: readonly unknown[],
buildUrl: () => string,
options: { enabled?: boolean; staleTime?: number; retry?: number; refetchInterval?: number; retryDelay?: (attempt: number) => number; select?: (raw: TRaw) => T } = {},
) {
const { enabled = true, staleTime = STALE_TIME.DEFAULT, retry = 2, refetchInterval, retryDelay, select } = options;
return useQuery<TRaw, Error, T>({
queryKey, queryFn: async () => { const res = await fetch(buildUrl()); if (!res.ok) throw new Error(`API error: ${res.status}`); return res.json() as Promise<TRaw>; },
select, enabled, staleTime, retry,
...(refetchInterval !== undefined && { refetchInterval }),
...(retryDelay !== undefined && { retryDelay }),
});
}
Applied to 11 hooks (useDashboard, useAgentStats, useTraceEvaluations, and 8 others), eliminating ~100+ lines of boilerplate. Used two-type-param approach for correct TQ memoization of select option.
Example conversion — useAgentStats with custom validation:
export function useAgentStats(period: Period) {
return useApiQuery<unknown, AgentStatsResponse>(
['agent-stats', period],
() => `${API_BASE}/api/agents?period=${encodeURIComponent(period)}`,
{ staleTime: STALE_TIME.AGGREGATE, select: (raw) => { assertAgentStatsResponse(raw); return raw; } },
);
}
Files refactored: useDashboard.ts, useAgentStats.ts, useTraceEvaluations.ts, and 8 others.
H5: PageShell in CompliancePage
File: src/pages/CompliancePage.tsx:18–40
Adopted PageShell wrapper for unified loading/error handling:
// Before: manual per-section state handling
const [slaLoading, setSlaLoading] = useState(false);
const [slaError, setSlaError] = useState<string | null>(null);
const [verLoading, setVerLoading] = useState(false);
const [verError, setVerError] = useState<string | null>(null);
// ...conditional skeleton rendering in JSX
// After: combined state via PageShell
return (
<PageShell isLoading={slaLoading || verLoading} error={slaError ?? verError}>
{/* Unified skeleton and error display */}
</PageShell>
);
Removed ~15 LOC of per-section skeleton/error handling. Removed unnecessary Link import.
M5–M8: Component Extraction
Created 5 new reusable components:
| Component | File | Purpose | LOC |
|---|---|---|---|
| TruncatedList | src/components/TruncatedList.tsx | Generic <TruncatedList<T> items max renderItem total /> for slice+map+”+N more” | 20 |
| Stat | src/components/Stat.tsx | Numeric stat display with label | 15 |
| FreqBar | src/components/FreqBar.tsx | Frequency bar with label, count, and bar indicator | 18 |
| MetadataRow | src/components/MetadataRow.tsx | Horizontal label–value pair (nullish-safe) | 16 |
| TruncatedIdLink | src/components/TruncatedIdLink.tsx | Link with truncated ID display and full ID hover title | 17 |
Example — TruncatedIdLink applied to AgentActivityPanel session/trace columns:
// Before
<Link key={sid} href={`/sessions/${sid}`} className="mono-xs link-accent" onClick={(e) => e.stopPropagation()}>
{truncateId(sid, 12)}
</Link>
// After
<TruncatedIdLink key={sid} id={sid} href={`/sessions/${sid}`} maxLen={12} onClick={(e) => e.stopPropagation()} />
Applied to 3 instances in SessionDetailPage and 2 in AgentActivityPanel.
L5: Recharts Config Constants
File: src/lib/constants.ts (7 new exports)
Extracted shared Recharts configuration to eliminate duplication between TrendChart and TrendSeries:
export const CHART_MARGIN = { top: 8, right: 16, bottom: 4, left: 16 };
export const CHART_GRID_PROPS = { stroke: CHART_COLORS.grid, strokeDasharray: '3 3' };
export const CHART_AXIS_TICK = { fill: CHART_COLORS.text, fontSize: 12 };
export const CHART_TOOLTIP_CONTENT_STYLE = {
backgroundColor: CHART_COLORS.tooltip,
border: `1px solid ${CHART_COLORS.grid}`,
borderRadius: 6,
color: CHART_COLORS.text,
fontSize: 12,
};
export const CHART_TOOLTIP_LABEL_STYLE = { color: '#e6edf3' };
export const CHART_YAXIS_WIDTH = 48;
export const CHART_YAXIS_TICK_FORMATTER = (v: number): string => v.toFixed(2);
Applied to both TrendChart.tsx and TrendSeries.tsx via spread syntax and direct reference. Hardened CHART_YAXIS_TICK_FORMATTER to accept only number (not number | string union).
CSS Token & Utility Consolidation (L1–L4)
L1 — Converted hardcoded px to space tokens: min-height: var(--space-half), border-left-width: var(--space-1), height: var(--space-1-5) (src/theme.css).
L2 — Standardized all fade-in durations to var(--transition-fast) (was 0.15s, 0.2s, mixed).
L3 — Completed mono utility matrix: added .mono-2xs, .mono-base, .mono-md, .mono-lg, .mono-2xl.
L4 — Filled gap/margin coverage: added .gap-5, .gap-16, .mb-4 utilities.
Testing and Verification
TypeScript Typecheck
npx tsc --noEmit
✓ Zero errors
Test Suite
Test Files: 17 passed (17)
Tests: 293 passed (293)
Start: 21:29:59
Duration: 2.45s
All tests passed throughout all 18 commits. No regressions.
Code Review Gates
Per-commit reviews: Each of 18 commits reviewed individually by code-reviewer agent. Review gates required Overall: PASS before proceeding. Two commits required follow-up fixes (H4: select option signature, H1: missing info token).
Final full-stack review: Comprehensive review of all changes across dashboard.
Final Score: 8/10 (score breakdown: 0 critical, 0 high severity; 4 medium items mostly pre-existing patterns; 4 low items for future improvement)
Files Modified/Created
Created (5 files)
src/components/TruncatedList.tsx(20 LOC)src/components/Stat.tsx(15 LOC)src/components/FreqBar.tsx(18 LOC)src/components/MetadataRow.tsx(16 LOC)src/components/TruncatedIdLink.tsx(17 LOC)
Modified (15 files)
src/lib/constants.ts(+29 LOC: added 7 CHART_* exports)src/theme.css(−50 LOC: consolidated rules, added utilities)src/hooks/useApiQuery.ts(created, +28 LOC)src/hooks/useDashboard.ts(−8 LOC)src/hooks/useAgentStats.ts(−5 LOC)src/hooks/useTraceEvaluations.ts(−6 LOC)src/pages/CompliancePage.tsx(−15 LOC)src/pages/SessionDetailPage.tsx(−80 LOC: moved components)src/components/TrendChart.tsx(−20 LOC: use shared constants)src/components/TrendSeries.tsx(−20 LOC: use shared constants)src/components/ScoreBadge.tsx(−10 LOC: use MetadataRow)src/components/AgentActivityPanel.tsx(−5 LOC: use TruncatedIdLink)src/components/HealthOverview.tsx(attribute-based theming)src/components/AlertList.tsx(attribute-based theming)src/components/Indicators.tsx(attribute-based theming)
Documentation
docs/BACKLOG.md(updated: marked 14 items Done, recorded 8 follow-ups FR1–FR8)docs/CHANGELOG.md(added v2.29 entry)docs/changelog/2.29/CHANGELOG.md(created: full migration log)
Commit History
| Commit | Message | Impact |
|---|---|---|
| ea59b38 | refactor(theme): consolidate status color mapping (H1) | 5 files, data-attribute pattern |
| f1d36ee | fix(theme): add info token rule for data-status | Added missing [data-status="info"] |
| 0c62094 | refactor(hooks): extract useApiQuery factory (H4) | 11 hooks, ~100+ LOC |
| 0d0410a | fix(hooks): use native TQ select with type params (H4 follow-up) | Signature correction |
| c539524 | refactor(pages): adopt PageShell in CompliancePage (H5) | Unified loading/error |
| 23e30f9 | refactor(theme): consolidate table header selectors (M3) | Merged 3 rules |
| 5bf70ab | refactor(theme): extract tooltip font-size (M4) | Shared base rule |
| be078a3 | refactor(components): extract TruncatedList (M5) | 3 instances, generic <T> |
| 550c5cb | docs(TruncatedList): add JSDoc on total prop | Clarified server-side use |
| 7a22356 | refactor(components): move Stat and FreqBar (M6) | 2 new components |
| 34e50d2 | refactor(components): extract MetadataRow (M8) | Nullish-safe pattern |
| d165340 | refactor(theme): space tokens for hardcoded px (L1) | 6 instances |
| d535ad7 | refactor(theme): standardize fade-in animation (L2) | All → var(–transition-fast) |
| 1a11f57 | refactor(theme): complete mono matrix + gap/margin (L3, L4) | Full utility coverage |
| 2ce5347 | refactor(charts): extract Recharts config constants (L5) | 7 shared exports |
| 2bbb960 | fix(charts): harden CHART_YAXIS_TICK_FORMATTER (L5 follow-up) | Defensive signature |
| 285a533 | feat(components): create TruncatedIdLink (L6) | Link+truncateId pattern |
| 6fab38d | fix(constants): narrow formatter to number; record follow-ups | Narrowed type; recorded FR1–FR8 |
| bf7c68a | docs(backlog): mark all 14 items Done | BACKLOG.md update |
| 09705b5 | chore(changelog): migrate to v2.29 | Created v2.29 changelog entry |
References
- Previous Session: Session aaf11fa backlog analysis (private repo)
- v2.29 Changelog:
docs/changelog/2.29/CHANGELOG.md - Component Files:
src/components/{TruncatedList,Stat,FreqBar,MetadataRow,TruncatedIdLink}.tsx - Hook Factory:
src/hooks/useApiQuery.ts:1–28 - Constants:
src/lib/constants.ts:125–148 - Test Results: 293/293 tests passing; 17 test files (Vitest)
- Code Review: Final score 8/10; final-review report appended to session context
Follow-ups (Future Sessions)
8 low-priority items recorded in BACKLOG.md for future implementation:
| ID | Title | Category |
|---|---|---|
| FR1 | Remove redundant COLORS spread in TrendChart | Design pattern |
| FR2 | Document buildUrl/enabled contract in useApiQuery | Documentation |
| FR3 | Move Stat magic numbers to theme.css classes | CSS refactoring |
| FR4 | Add JSDoc on TruncatedList renderItem key requirement | Documentation |
| FR5 | Add role=”img” to TrendChart aria-label container | Accessibility |
| FR6 | Accept labelWidth prop or CSS grid in FreqBar | Component flexibility |
| FR7 | Handle empty string in MetadataRow nullish check | Edge case handling |
| FR8 | Use var(–bg-page) instead of hardcoded hex in TrendSeries | Dark-mode consistency |
| Generated: 2026-03-01 | Project: quality-metrics-dashboard v2.29 | Duration: ~4 hours |