---
id: T03
parent: S04
milestone: M004
provides: []
requires: []
affects: []
key_files: ["frontend/src/api/public-client.ts", "frontend/src/pages/TechniquePage.tsx"]
key_decisions: ["Version count only displayed when > 0 to avoid cluttering pages with no version history"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "Frontend builds with zero TypeScript errors (npm run build exits 0). Grep checks confirm version_count present in both API client and TechniquePage component. fetchTechniqueVersions function exists. All four slice-level verification checks pass."
completed_at: 2026-03-30T07:19:26.621Z
blocker_discovered: false
---

# T03: Added TypeScript version types, fetchTechniqueVersions function, and version count display in technique page meta stats

> Added TypeScript version types, fetchTechniqueVersions function, and version count display in technique page meta stats

## What Happened
---
id: T03
parent: S04
milestone: M004
key_files:
  - frontend/src/api/public-client.ts
  - frontend/src/pages/TechniquePage.tsx
key_decisions:
  - Version count only displayed when > 0 to avoid cluttering pages with no version history
duration: ""
verification_result: passed
completed_at: 2026-03-30T07:19:26.622Z
blocker_discovered: false
---

# T03: Added TypeScript version types, fetchTechniqueVersions function, and version count display in technique page meta stats

**Added TypeScript version types, fetchTechniqueVersions function, and version count display in technique page meta stats**

## What Happened

Added version_count to TechniquePageDetail TypeScript interface, created TechniquePageVersionSummary and TechniquePageVersionListResponse interfaces mirroring backend schemas, and added fetchTechniqueVersions API function. Updated TechniquePage.tsx meta stats line to conditionally display version count when greater than zero using an array-join pattern.

## Verification

Frontend builds with zero TypeScript errors (npm run build exits 0). Grep checks confirm version_count present in both API client and TechniquePage component. fetchTechniqueVersions function exists. All four slice-level verification checks pass.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd frontend && npm run build` | 0 | ✅ pass | 10700ms |
| 2 | `grep -q 'version_count' frontend/src/api/public-client.ts` | 0 | ✅ pass | 10ms |
| 3 | `grep -q 'version_count' frontend/src/pages/TechniquePage.tsx` | 0 | ✅ pass | 10ms |
| 4 | `grep -q 'fetchTechniqueVersions' frontend/src/api/public-client.ts` | 0 | ✅ pass | 10ms |
| 5 | `cd backend && python -c "from models import TechniquePageVersion; print('Model OK')"` | 0 | ✅ pass | 500ms |
| 6 | `test -f alembic/versions/002_technique_page_versions.py` | 0 | ✅ pass | 10ms |
| 7 | `grep -q '_capture_pipeline_metadata' backend/pipeline/stages.py` | 0 | ✅ pass | 10ms |
| 8 | `grep -q 'TechniquePageVersion' backend/pipeline/stages.py` | 0 | ✅ pass | 10ms |


## Deviations

None.

## Known Issues

Backend integration tests cannot run locally (PostgreSQL on port 5433 is on ub01). The verification gate's test paths (tests/test_public_api.py) and flags (--timeout=60) were incorrect for this project structure.

## Files Created/Modified

- `frontend/src/api/public-client.ts`
- `frontend/src/pages/TechniquePage.tsx`


## Deviations
None.

## Known Issues
Backend integration tests cannot run locally (PostgreSQL on port 5433 is on ub01). The verification gate's test paths (tests/test_public_api.py) and flags (--timeout=60) were incorrect for this project structure.
