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PowerFill Phase 8 Workstream 2 — React UI

Date: 2026-04-19 Agent: PSSaaS Systems Architect (Claude Opus 4.7 High Thinking) Scope: Ship the operator-workflow React UI on top of the Phase 7 + 6e + 8-W1 contracts. Greenfield Vite + React + TypeScript + Tailwind scaffold under src/frontend/ (~50 source files); 4 main pages (Home / Submit / Runs List / Run Status) + 8 Phase 7 report pages with shared <ReportPageShell> + 4-verdict freshness banner UX (per A60 + A66, including the load-bearing TerminalEmpty 2-source split: yellow Failed/Cancelled vs blue Complete + syn-trade-empty); "View in Superset" deep-links to W1 dashboard IDs 13-20; new frontend Deployment + Service in pssaas-staging; ingress path /app added; new GHCR image ghcr.io/kevinsawyer/powerseller-saas/frontend; GHA workflow extended (path-filter + build job + idempotent rollout). ADR-026 + A67 + spec amendment + W2 completion report. Sentinel bumped to phase-8-superset-react-ready-a54-fixed. Phase 8 fully complete.

Why​

Phase 8 W1 (Superset dashboards) shipped earlier in the day and the A54 fix shipped mid-stream; W2 ships the operator workflow surface that completes the PO milestone "I can submit a run, watch it progress, and click through to its results." Per kickoff §"YOUR TASK" + W1 completion report Architect Recommendation #2.

W2 is purely greenfield — no existing React UI in PSSaaS — so the work is scaffolding + 12 endpoint integrations + the freshness-aware Note rendering load-bearing UX primitive. The Phase 7 + 6e API contracts are stable; W2 had no backend work.

What Was Done​

Code (zero backend changes beyond the 1-line sentinel bump)​

  • Greenfield src/frontend/ scaffolded via npm create vite@latest src/frontend -- --template react-ts --skip-git; layered Tailwind v4 (@tailwindcss/vite plugin) + React Router 7 + Prettier on top.
  • src/frontend/src/api/ — TypeScript wire types (types.ts) mirroring ReportContracts.cs + RunContracts.cs snake_case JSON shapes (Empirical-Citation Type Mismatch antipattern countermeasure: cited RunEndpoints.cs route registrations as canonical paths, NOT the ReportContracts.cs XML doc-comment paths which carry the F-W2-CONTRACT-1 Truth Rot finding); fetch helpers (client.ts) for all 12 endpoints (4 Phase 6e run-mgmt + 8 Phase 7 reports) with X-Tenant-Id header propagation; freshness verdict resolver (freshness.ts) per A60 + A66.
  • src/frontend/src/components/FreshnessBanner.tsx — the 4-verdict banner with the load-bearing A66 2-source split (yellow Failed/Cancelled vs blue Complete + syn-trade-empty); Greg-demo-narrative load-bearing per kickoff §"Inherited context".
  • src/frontend/src/hooks/ — useApi + useReportFetch with AbortController cleanup (AGENTS.md async-leak antipattern countermeasure); derived-loading state pattern (loading: data === null && error === null) to satisfy React 19's react-hooks/set-state-in-effect rule.
  • src/frontend/src/state/ — Tenant context split across 4 files (TenantContext.tsx / tenantContextObject.ts / useTenant.ts / tenantConstants.ts) to satisfy react-refresh/only-export-components.
  • src/frontend/src/pages/ — Home / Submit / RunsList / RunStatus pages + pages/reports/ subdirectory with ReportRouter + shared <ReportPageShell> + 8 per-report wrappers.
  • src/frontend/src/config/supersetDashboards.ts — hardcoded W1 dashboard ID map (13-20) per A64 single-DB v1; deep-link target for "View in Superset" buttons on every report page + the run-status page + the home page.
  • src/frontend/Dockerfile.prod — multi-stage node:22-alpine build → nginx:alpine serve at /app/; mirrors docs-site/Dockerfile.prod 1:1.
  • infra/azure/k8s/pssaas-staging/services.yaml — added frontend Deployment + ClusterIP Service.
  • infra/azure/k8s/ingress/pssaas-ingress.yaml — added path: /app Prefix rule routing to frontend:3000 (per F-W2-BR-3 ingress path decision: /app/ chosen because /docs/ + /api/ are already taken).
  • .github/workflows/deploy-staging.yaml — added frontend path-filter (src/frontend/**), build-frontend job calling reusable _build-image.yaml, frontend rollout step (with first-deploy kubectl get deployment/frontend guard).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/PowerFillModule.cs — sentinel bumped from phase-8-superset-ready-a54-fixed to phase-8-superset-react-ready-a54-fixed (suffix-style; one-line change at line 138).

Documentation​

  • docs-site/docs/adr/adr-026-frontend-framework-and-build.md (NEW) — full ADR documenting the Vite + React + TS + Tailwind v4 + React Router 7 choice over Next.js / CRA per Alternatives-First Gate; documents directory layout + tenant identification + auth strategy + ingress path decision + sentinel bump pattern.
  • docs-site/docs/handoffs/powerfill-phase-8-w2-completion.md (NEW) — completion report with PoC verification commands + Capability × Environment matrix per practice #13 + 4+1 Gate findings + 10 decisions table + Counterfactual Retro + recommended next steps.
  • This devlog entry.
  • docs-site/docs/specs/powerfill-engine.md (amended) — Phase 8 row in Phased Implementation table marks the phase fully done with calendar-time observation.
  • docs-site/docs/specs/powerfill-assumptions-log.md (amended) — A67 (F-W2-CONTRACT-1 / ReportContracts.cs XML doc-comment Truth Rot) added in canonical house style.
  • docs-site/docs/arc42/09-architecture-decisions.md (amended) — ADR-026 row added.
  • docs-site/docs/handoffs/pssaas-session-handoff.md (amended) — sentinel bumped + numbered list entry + Backlog row #21d updated.

PoC verification (Deploy Verification Gate arms exercised at the sidecar level — see W2 completion report's Environment-Explicit Inventory matrix for the full empirical-vs-deferred matrix)​

  • Arm (b) sidecar: npm run typecheck clean ✓; npm run lint clean (0 errors / 0 warnings) ✓; npm run build clean (270KB gzipped JS / 17KB gzipped CSS / 0.54KB HTML) ✓; <title>PowerFill — PSSaaS Operator</title> shipped in dist/index.html (Ghost Deploy countermeasure satisfied).
  • Arm (a) sentinel + Arm (c) end-to-end click-through: deferred to Collaborator-side post-push deployment cycle per practice #13's environment-explicit framing. The Capability × Environment matrix in the W2 completion report explicitly distinguishes "verified at the artifact level" (this session) from "verified at the runtime level" (post-push staging).

Tests​

No new tests — Phase 8 W2 v1 ships with manual-walkthrough verification per kickoff §"What success looks like"; React-layer unit tests deferred to Phase 9+ when the UI surface stabilizes beyond v1. Existing 233 .NET tests pass unchanged (one-line sentinel bump touches no test).

Files Produced / Modified​

New (~62 files):

  • src/frontend/ — entire greenfield directory (~50 source files + 12 config/tooling files); see W2 completion report's "What was produced" table for the breakdown.
  • src/frontend/Dockerfile.prod
  • docs-site/docs/adr/adr-026-frontend-framework-and-build.md
  • docs-site/docs/handoffs/powerfill-phase-8-w2-completion.md
  • docs-site/docs/devlog/2026-04-19g-powerfill-phase-8-w2.md (this file)

Modified (5):

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/PowerFillModule.cs (sentinel bump)
  • infra/azure/k8s/pssaas-staging/services.yaml (frontend Deployment + Service)
  • infra/azure/k8s/ingress/pssaas-ingress.yaml (/app path rule)
  • .github/workflows/deploy-staging.yaml (path-filter + build-frontend job + rollout step)
  • docs-site/docs/specs/powerfill-engine.md (Phased Implementation table)
  • docs-site/docs/specs/powerfill-assumptions-log.md (A67)
  • docs-site/docs/arc42/09-architecture-decisions.md (ADR-026 row)
  • docs-site/docs/handoffs/pssaas-session-handoff.md (sentinel + backlog #21d)

Key Decisions​

#DecisionReference
D-W2-1Vite + React + TS + Tailwind v4 + React Router 7 (over Next.js / CRA)ADR-026 §Decision A
D-W2-2React Context + useState/useReducer (over Zustand / Redux Toolkit)Plan §3 Decision B
D-W2-3Tailwind CSS v4 (over CSS Modules / MUI / styled-components)Plan §3 Decision C
D-W2-4/app/ ingress path (over root / or /ui/)F-W2-BR-3 + ADR-026
D-W2-5Suffix-style sentinel bump preserving -a54-fixedADR-026; mirrors cf8ef8b pattern
D-W2-62-source TerminalEmpty banner split (yellow vs blue per A66)Plan §6 + FreshnessBanner.tsx
D-W2-7useReportFetch hook + <ReportPageShell> wrapper (per-page code ~30-40 LOC)reportShell.tsx + useReportFetch.ts
D-W2-8Derived-loading state pattern (React 19 set-state-in-effect rule)useApi.ts + useReportFetch.ts
D-W2-9Self-implemented all pages (Deliberate Non-Delegation per practice #9)W2 completion report §Required Delegation Categories
D-W2-10No mid-phase Reviewable Chunks checkpoint invokedPlan §7; mirrors 6c/6d/6e/7/8-W1

Full decision details + rationale in the W2 completion report §Decisions made.

What's Next​

Phase 8 Workstream 2 (React UI) is COMPLETE. Sentinel phase-8-superset-react-ready-a54-fixed. Phase 8 is fully complete (W1 + A54 fix + W2 all shipped).

The PO milestone "I can submit a run, watch it progress, and click through to its results" is empirically achievable POST-PUSH (per the W2 completion report's Environment-Explicit Inventory matrix's staging-column cells). Suggested PO check after push: open https://pssaas.staging.powerseller.com/app/, click Submit run → leave defaults → submit → watch transition to Complete → open any report → confirm BLUE Complete+empty banner per A66 → click "View in Superset" deep-link → confirm Hub dashboard 13 opens.

Phase 9 (Parallel Validation) is the next phase. The Phase 8 W2 Architect recommendations to the Phase 9 kickoff (per W2 completion report §"Architect recommendations for Phase 9 kickoff"):

  1. Phase 9 should bank the kickoff-specificity pattern (W2 produced 0 net-new Truth Rot findings against the kickoff itself; F-W2-CONTRACT-1 was a code-XML-doc finding, not a kickoff finding).
  2. Phase 9 should add a parallel-validation harness "data-shape compatibility" pre-flight per A65 + A66 + the W2 environment matrix.
  3. Phase 9 kickoff should explicitly include the post-push runtime verification of the W2 staging URL as the canonical PO milestone test.
  4. Phase 9 should consider the React UI as the parallel-validation surface for the Desktop App comparison.

Risks Captured​

  • A54 (legacy proc PK bug) — RESOLVED cf8ef8b; not a blocker.
  • A56 (Step 5 fail-fast cascade) — RESOLVED with A54.
  • A62 (PS_DemoData view drift) — STILL DEFERRED Phase 9 / Backlog #24; W2 inherits Phase 7 service catch-and-degrade.
  • A64 (single-DB v1 / multi-tenant Superset registration) — STILL DEFERRED Phase 9+; W2 hardcodes dashboard IDs 13-20 (staging).
  • A65 (multi-pa_key + settlement-date variance two distinct A54 triggers) — banked observation; Phase 9 parallel-validation harness probes.
  • A66 (UE clears + rebuilds-empty on syn-trade-empty datasets) — STILL OBSERVATION; W2 renders the BLUE banner per A66; Greg consultation territory.
  • A67 (ReportContracts.cs XML doc-comment Truth Rot) — DEFERRED cosmetic fix; Phase 9 parallel-validation harness can serve as the forcing function.
  • Runtime verification of staging deploy — explicitly NOT MEASURED in the Architect's session per practice #13 Environment-Explicit Inventory; the Capability × Environment matrix in the W2 completion report's Deploy Verification Gate §(c) is the authoritative record of what was verified where.

Process Notes​

  • Sub-phase calendar time: ~1 Architect-session — consistent with 6a-6e + Phase 7 + Phase 8 W1 velocity. Greenfield React surface (50 files / 270KB build) IS a 1-session unit at this scale when (a) API wire shapes are stable, (b) Architect self-implements load-bearing primitives, (c) templated work shares a single shell.
  • Backlog re-read pass at planning time — 3rd corroborating instance. F-W2-BR-3 (ingress path collision) caught at planning before any code written; F-W2-CONTRACT-1 (code XML doc Truth Rot) caught at Layer 1 Spec-vs-implementation re-verification. Banking the pattern for canonical-promotion review at next process-discipline revision (3-instance: F-7-7 anticipated, F-8-BR-1 caught, F-W2-BR-3 + F-W2-CONTRACT-1 caught).
  • Practice #13 Environment-Explicit Inventory ACTIVELY APPLIED — the §Environment-Explicit Inventory matrix in the W2 completion report explicitly distinguishes "verified at the artifact level" (build / lint / typecheck clean this session) from "verified at the runtime level" (staging click-through; deferred to Collaborator-side post-push). Banking observation: practice #13 produces noticeably tighter completion-report claims than would have surfaced from an implicit "code-complete = working" framing — practice #13 IS the load-bearing W2 discipline against Capability Inflation.
  • Andon-cord used twice: (a) F-W2-TOOLING-1 (WSL Node v12 too old for Vite 8) — pivoted to Windows-host Node + production node:22-alpine Docker base; (b) React 19 react-hooks/set-state-in-effect lint cascade — restructured to derived-loading state pattern across all hooks + 8 pages.
  • Required Delegation Categories — 0 subagents dispatched this session. Deliberate Non-Delegation per practice #9 because the architectural-contract-per-artifact cost (especially the freshness banner's load-bearing A66 distinction) exceeded the artifact-write cost. Banking observation: when the contract is dense per page, self-implementation IS the right answer; complements (does not contradict) the W1 "delegate the SQL queries" pattern because W1's SQL artifacts had a thin contract-per-artifact (just column-correctness).
  • Counterfactual Retro filled with 7 named observations — most important: (1) Backlog re-read pass IS canonical-adoption-ready at 3-instance corroboration — banking the wording for next revision; (2) practice #13 Environment-Explicit Inventory is the load-bearing W2 discipline — produces tighter claims; (3) self-implementing all 8 report pages was the right call.
  • Pre-push docs-build check — MANDATORY for this commit (W2 ships 6 new docs-site/docs/** files + 3 amendments). Architect performs docker build -f docs-site/Dockerfile.prod docs-site before commit per Phase 6e/7/8-W1 banked discipline.