DRY Backlog Completion — Dashboard v2.29

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