---
id: T01
parent: S03
milestone: M014
provides: []
requires: []
affects: []
key_files: ["alembic/versions/012_multi_source_format.py", "backend/models.py", "backend/schemas.py"]
key_decisions: ["Used TIMESTAMP (not WITH TIME ZONE) for added_at to stay consistent with existing schema convention"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "Model imports pass with attribute assertions. Schema imports pass. Migration file compiles cleanly. Alembic upgrade head deferred to Docker execution on ub01."
completed_at: 2026-04-03T01:16:27.993Z
blocker_discovered: false
---

# T01: Added body_sections_format column, technique_page_videos association table, and SourceVideoSummary schema for multi-source technique pages

> Added body_sections_format column, technique_page_videos association table, and SourceVideoSummary schema for multi-source technique pages

## What Happened
---
id: T01
parent: S03
milestone: M014
key_files:
  - alembic/versions/012_multi_source_format.py
  - backend/models.py
  - backend/schemas.py
key_decisions:
  - Used TIMESTAMP (not WITH TIME ZONE) for added_at to stay consistent with existing schema convention
duration: ""
verification_result: passed
completed_at: 2026-04-03T01:16:27.994Z
blocker_discovered: false
---

# T01: Added body_sections_format column, technique_page_videos association table, and SourceVideoSummary schema for multi-source technique pages

**Added body_sections_format column, technique_page_videos association table, and SourceVideoSummary schema for multi-source technique pages**

## What Happened

Created Alembic migration 012 with body_sections_format VARCHAR(20) NOT NULL DEFAULT 'v1' on technique_pages and technique_page_videos association table with dual CASCADE FKs and unique constraint. Updated SQLAlchemy models with TechniquePageVideo class and body_sections_format column. Widened Pydantic body_sections type to list | dict | None, added SourceVideoSummary schema, and added source_videos field to TechniquePageDetail.

## Verification

Model imports pass with attribute assertions. Schema imports pass. Migration file compiles cleanly. Alembic upgrade head deferred to Docker execution on ub01.

## 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 | `python -c "import py_compile; py_compile.compile('alembic/versions/012_multi_source_format.py', doraise=True)"` | 0 | ✅ pass | 200ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `alembic/versions/012_multi_source_format.py`
- `backend/models.py`
- `backend/schemas.py`


## Deviations
None.

## Known Issues
None.
