---
id: M004
title: "UI Polish, Bug Fixes, Technique Page Redesign, and Article Versioning"
status: complete
completed_at: 2026-03-30T07:24:19.948Z
key_decisions:
  - D018: Best-effort versioning — snapshot INSERT failure logs ERROR but does not block page update. Still valid: versioning is diagnostic, not critical path.
  - Single-resource GET endpoints preferred over client-side filtering of list responses (S01 pattern)
  - 77 CSS custom properties (vs ~30 planned) for complete color abstraction — all future CSS must use var(--*) tokens
  - Pre-overwrite snapshot pattern: capture current state before mutating DB rows, with pipeline metadata for audit/benchmarking
  - _capture_pipeline_metadata() hashes prompt files at synthesis time — reusable for any stage needing reproducibility metadata
key_files:
  - backend/routers/creators.py
  - backend/routers/review.py
  - backend/routers/techniques.py
  - backend/schemas.py
  - backend/models.py
  - backend/pipeline/stages.py
  - alembic/versions/002_technique_page_versions.py
  - backend/tests/test_public_api.py
  - frontend/src/App.css
  - frontend/index.html
  - frontend/src/api/client.ts
  - frontend/src/api/public-client.ts
  - frontend/src/pages/MomentDetail.tsx
  - frontend/src/pages/TechniquePage.tsx
lessons_learned:
  - CSS token count will exceed initial estimates when fully eliminating hardcoded colors — plan for 2-3x the obvious count due to hover/focus/subtle variants, badge backgrounds, and distinct semantic contexts
  - Single-resource GET endpoints are always worth adding alongside list endpoints — client-side filtering of lists is a code smell that breaks at scale
  - Pre-overwrite snapshot pattern (capture before mutate) is clean for versioning without complex CDC infrastructure — works well with JSONB content_snapshot for flexible schema evolution
  - Best-effort side effects (log ERROR, don't block) is the right pattern for diagnostic/enrichment features that shouldn't compromise the primary data flow
---

# M004: UI Polish, Bug Fixes, Technique Page Redesign, and Article Versioning

**Fixed API bugs (creators 422, review detail), applied dark theme with cyan accents and mobile responsive fixes, redesigned technique pages to match reference layout, and added article versioning with pipeline metadata capture.**

## What Happened

M004 addressed four distinct fronts across four slices, all shipping real code changes (14 files, 873 insertions) deployed to ub01.

**S01 (Bug Fixes):** Two API bugs blocked the UI with real pipeline data. The creators endpoint returned a plain array instead of the paginated `{items, total, offset, limit}` wrapper the frontend expected — fixed in `creators.py`. The review detail page fetched the entire queue and filtered client-side, which broke at scale — replaced with a proper `GET /review/moments/{id}` single-resource endpoint. Both verified against 72 real key moments on ub01.

**S02 (Dark Theme + Mobile):** Audited all ~1770 lines of App.css. Replaced 193 hex color references and 24 rgba values with 77 semantic CSS custom properties in `:root`. Cyan `#22d3ee` replaced indigo `#6366f1` as the accent color throughout. Fixed mobile horizontal overflow via `overflow-x: hidden` on html/body plus three targeted fixes (mode-toggle truncation, creator-row stats wrapping, header flex-wrap). Updated HTML metadata (title, theme-color). Visually verified at desktop (1280×800) and mobile (390×844) viewports.

**S03 (Technique Page Redesign):** Backend: chained `selectinload(KeyMoment.source_video)` to populate `video_filename` on each key moment in the technique detail response. Frontend: added meta stats line (source count, moment count, last-updated), video filename display per moment (monospace, ellipsis truncation at 20rem), and signal chain flow blocks with cyan arrow separators replacing the previous numbered list. All CSS uses var(--*) tokens exclusively.

**S04 (Article Versioning):** Added `TechniquePageVersion` model with JSONB content_snapshot and pipeline_metadata. Alembic migration 002 creates the table with a composite unique index. `_capture_pipeline_metadata()` hashes all prompt template files (SHA-256) and collects model config. Stage 5 now snapshots the current page state before overwriting — best-effort, so INSERT failures log ERROR but don't block synthesis. Two API endpoints (version list, version detail) and frontend version count display. Six integration tests covering list, detail, 404s, and version_count.

## Success Criteria Results

- **Fix 422 errors on review detail + creators page** — ✅ MET. S01 fixed both: creators returns paginated response, review detail uses new single-moment endpoint. Verified with `curl` against ub01:8096 with 72 real key moments.
- **Dark mode theme with cyan accents** — ✅ MET. S02 defined 77 CSS custom properties, replaced all 193 hex + 24 rgba values. Cyan #22d3ee throughout. Visual verification on ub01:8096.
- **No horizontal scroll on mobile** — ✅ MET. S02 added overflow-x:hidden, fixed three specific sources. Browser verification at 390px: scrollWidth === clientWidth.
- **Technique page matches reference HTML layout** — ✅ MET. S03 added meta stats line, video filenames on key moments, signal chain flow blocks with cyan arrows. Verified on wave-shaping technique page with 13 real moments.
- **Article versioning with pipeline metadata** — ✅ MET. S04 delivered model, migration, pipeline hook, API endpoints, frontend display. 6 integration tests pass.

## Definition of Done Results

- **All slices complete** — ✅ S01, S02, S03, S04 all marked ✅ in roadmap.
- **All slice summaries exist** — ✅ S01-SUMMARY.md, S02-SUMMARY.md, S03-SUMMARY.md, S04-SUMMARY.md all present.
- **Cross-slice integration verified** — ✅ S01→S03 (technique endpoint fix consumed), S02→S03/S04 (CSS token system inherited), S03→S04 (version count added to meta stats). No boundary mismatches.
- **Code changes verified** — ✅ 14 files changed, 873 insertions across backend, frontend, alembic, and tests.

## Requirement Outcomes

- **R004** (Review Queue UI) — Stays `validated`. S01 fixed the review detail 422 error and added GET /review/moments/{id}. Improvement to an already-validated requirement.
- **R006** (Technique Page Display) — Stays `validated`. S03 added meta stats, video filenames, signal chain flow blocks matching reference layout. Significant visual improvement.
- **R007** (Creators Browse Page) — Stays `validated`. S01 fixed creators endpoint to return paginated response. Page now loads with real data.
- **R013** (Prompt Template System) — Stays `validated`. S04 captures prompt file SHA-256 hashes at synthesis time, creating traceable link between prompt versions and output quality.

No requirement status transitions — all four were already validated and M004 improved their implementations.

## Deviations

CSS custom property count grew from planned ~30 to 77 — needed finer semantic granularity for complete coverage. S01 added a proper single-moment endpoint rather than just raising the list limit — better architectural fix than planned.

## Follow-ups

Alembic migration 002 needs explicit `alembic upgrade head` on ub01 production DB (likely already done during S04 deployment but not explicitly documented). Version list endpoint lacks pagination — acceptable at current scale but should be added if version counts grow. QdrantManager still uses random UUIDs for point IDs (deferred from earlier milestone) — re-indexing creates duplicates.
