---
id: T03
parent: S05
milestone: M019
provides: []
requires: []
affects: []
key_files: ["backend/schemas.py", "backend/routers/topics.py", "backend/routers/videos.py", "frontend/src/api/topics.ts", "frontend/src/pages/TopicsBrowse.tsx", "frontend/src/pages/Home.tsx"]
key_decisions: ["Added TopicListResponse and VideoListResponse as separate typed schemas rather than reusing generic PaginatedResponse — keeps response_model type-safe for OpenAPI docs"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "npm run build exits 0 (80 modules, zero TS errors). rg confirms no response_model=list remains in topics.py or videos.py. All slice-level checks pass: no public-client refs, core API files exist, 11 API modules."
completed_at: 2026-04-03T23:09:24.299Z
blocker_discovered: false
---

# T03: Normalized /topics and /videos endpoints from bare lists to paginated {items, total} response shape, updating backend schemas and two frontend consumers

> Normalized /topics and /videos endpoints from bare lists to paginated {items, total} response shape, updating backend schemas and two frontend consumers

## What Happened
---
id: T03
parent: S05
milestone: M019
key_files:
  - backend/schemas.py
  - backend/routers/topics.py
  - backend/routers/videos.py
  - frontend/src/api/topics.ts
  - frontend/src/pages/TopicsBrowse.tsx
  - frontend/src/pages/Home.tsx
key_decisions:
  - Added TopicListResponse and VideoListResponse as separate typed schemas rather than reusing generic PaginatedResponse — keeps response_model type-safe for OpenAPI docs
duration: ""
verification_result: passed
completed_at: 2026-04-03T23:09:24.299Z
blocker_discovered: false
---

# T03: Normalized /topics and /videos endpoints from bare lists to paginated {items, total} response shape, updating backend schemas and two frontend consumers

**Normalized /topics and /videos endpoints from bare lists to paginated {items, total} response shape, updating backend schemas and two frontend consumers**

## What Happened

Replaced bare list returns on GET /topics (list[TopicCategory] → TopicListResponse) and GET /videos (list[SourceVideoRead] → VideoListResponse). Added count query for videos total. Updated fetchTopics return type and both frontend consumers (TopicsBrowse.tsx, Home.tsx) to read .items. No frontend code calls the public /videos endpoint.

## Verification

npm run build exits 0 (80 modules, zero TS errors). rg confirms no response_model=list remains in topics.py or videos.py. All slice-level checks pass: no public-client refs, core API files exist, 11 API modules.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd frontend && npm run build` | 0 | ✅ pass | 3800ms |
| 2 | `rg 'response_model=list' backend/routers/topics.py backend/routers/videos.py` | 1 | ✅ pass (no matches) | 100ms |
| 3 | `rg 'public-client' frontend/src/ -g '*.ts' -g '*.tsx'` | 1 | ✅ pass (no matches) | 100ms |
| 4 | `test -f frontend/src/api/index.ts && test -f frontend/src/api/client.ts` | 0 | ✅ pass | 100ms |
| 5 | `ls frontend/src/api/*.ts | wc -l` | 0 | ✅ pass (11) | 100ms |


## Deviations

None.

## Known Issues

Backend tests require PostgreSQL on ub01 (port 5433) — not available locally.

## Files Created/Modified

- `backend/schemas.py`
- `backend/routers/topics.py`
- `backend/routers/videos.py`
- `frontend/src/api/topics.ts`
- `frontend/src/pages/TopicsBrowse.tsx`
- `frontend/src/pages/Home.tsx`


## Deviations
None.

## Known Issues
Backend tests require PostgreSQL on ub01 (port 5433) — not available locally.
