---
id: T02
parent: S04
milestone: M004
provides: []
requires: []
affects: []
key_files: ["backend/schemas.py", "backend/routers/techniques.py", "backend/tests/test_public_api.py"]
key_decisions: ["Version list returns all versions without pagination — version count per page expected to be small", "Version endpoints resolve slug first then query versions, 404 if slug not found (consistent with existing pattern)"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "All 6 new version tests pass. All 8 pre-existing technique/topic tests pass (no regressions). 4 slice-level verification checks all pass: model import, migration file exists, _capture_pipeline_metadata grep, TechniquePageVersion grep in stages.py."
completed_at: 2026-03-30T07:17:34.668Z
blocker_discovered: false
---

# T02: Added version list/detail API endpoints, Pydantic schemas, version_count on technique detail, and 6 integration tests

> Added version list/detail API endpoints, Pydantic schemas, version_count on technique detail, and 6 integration tests

## What Happened
---
id: T02
parent: S04
milestone: M004
key_files:
  - backend/schemas.py
  - backend/routers/techniques.py
  - backend/tests/test_public_api.py
key_decisions:
  - Version list returns all versions without pagination — version count per page expected to be small
  - Version endpoints resolve slug first then query versions, 404 if slug not found (consistent with existing pattern)
duration: ""
verification_result: passed
completed_at: 2026-03-30T07:17:34.668Z
blocker_discovered: false
---

# T02: Added version list/detail API endpoints, Pydantic schemas, version_count on technique detail, and 6 integration tests

**Added version list/detail API endpoints, Pydantic schemas, version_count on technique detail, and 6 integration tests**

## What Happened

Added three Pydantic schemas (TechniquePageVersionSummary, TechniquePageVersionDetail, TechniquePageVersionListResponse) and version_count field to TechniquePageDetail. Added GET /{slug}/versions and GET /{slug}/versions/{version_number} endpoints to the techniques router with proper 404 handling. Modified get_technique to count version rows. Wrote 6 integration tests covering empty list, populated list with DESC ordering, detail with content_snapshot, 404 for missing version, 404 for missing slug, and version_count on technique detail.

## Verification

All 6 new version tests pass. All 8 pre-existing technique/topic tests pass (no regressions). 4 slice-level verification checks all pass: model import, migration file exists, _capture_pipeline_metadata grep, TechniquePageVersion grep in stages.py.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd backend && python -m pytest tests/test_public_api.py -v -k version` | 0 | ✅ pass | 3200ms |
| 2 | `cd backend && python -c "from models import TechniquePageVersion; print('Model OK')"` | 0 | ✅ pass | 500ms |
| 3 | `test -f alembic/versions/002_technique_page_versions.py` | 0 | ✅ pass | 10ms |
| 4 | `grep -q '_capture_pipeline_metadata' backend/pipeline/stages.py` | 0 | ✅ pass | 10ms |
| 5 | `grep -q 'TechniquePageVersion' backend/pipeline/stages.py` | 0 | ✅ pass | 10ms |
| 6 | `cd backend && python -c "from schemas import TechniquePageVersionSummary, TechniquePageVersionDetail, TechniquePageVersionListResponse"` | 0 | ✅ pass | 500ms |


## Deviations

None.

## Known Issues

5 pre-existing creator test failures unrelated to versioning (API response format change). Pre-existing deadlock issues in test_search.py.

## Files Created/Modified

- `backend/schemas.py`
- `backend/routers/techniques.py`
- `backend/tests/test_public_api.py`


## Deviations
None.

## Known Issues
5 pre-existing creator test failures unrelated to versioning (API response format change). Pre-existing deadlock issues in test_search.py.
