---
id: T02
parent: S03
milestone: M014
provides: []
requires: []
affects: []
key_files: ["backend/routers/techniques.py"]
key_decisions: []
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "Alembic migration 012 ran clean. API response for existing technique shows body_sections_format: "v1" and source_videos: []. Tested via both Docker internal curl and external ub01:8096 URL."
completed_at: 2026-04-03T01:19:28.974Z
blocker_discovered: false
---

# T02: Wired source_videos and body_sections_format into technique detail API response with eager-loaded association table

> Wired source_videos and body_sections_format into technique detail API response with eager-loaded association table

## What Happened
---
id: T02
parent: S03
milestone: M014
key_files:
  - backend/routers/techniques.py
key_decisions:
  - (none)
duration: ""
verification_result: passed
completed_at: 2026-04-03T01:19:28.974Z
blocker_discovered: false
---

# T02: Wired source_videos and body_sections_format into technique detail API response with eager-loaded association table

**Wired source_videos and body_sections_format into technique detail API response with eager-loaded association table**

## What Happened

Updated get_technique() in backend/routers/techniques.py to eagerly load source_video_links relationship chained to source_video via selectinload. Built source_videos list from association table rows with content_type enum handling. Added imports for TechniquePageVideo and SourceVideoSummary. Deployed to ub01, ran Alembic migration 012, and verified API response includes both new fields with correct defaults.

## Verification

Alembic migration 012 ran clean. API response for existing technique shows body_sections_format: "v1" and source_videos: []. Tested via both Docker internal curl and external ub01:8096 URL.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd backend && python -c "from models import TechniquePageVideo, TechniquePage; assert hasattr(TechniquePage, 'body_sections_format'); print('models OK')"` | 0 | ✅ pass | 500ms |
| 2 | `cd backend && python -c "from schemas import SourceVideoSummary, TechniquePageDetail; print('schemas OK')"` | 0 | ✅ pass | 400ms |
| 3 | `ssh ub01 'docker exec chrysopedia-api alembic upgrade head'` | 0 | ✅ pass | 2000ms |
| 4 | `ssh ub01 'curl -s http://ub01:8096/api/v1/techniques/parallel-stereo-processing-keota | python3 -m json.tool | grep -E body_sections_format|source_videos'` | 0 | ✅ pass | 1000ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `backend/routers/techniques.py`


## Deviations
None.

## Known Issues
None.
