---
id: S01
parent: M005
milestone: M005
provides:
  - Pipeline admin page at /admin/pipeline with video management UI
  - Five admin pipeline API endpoints for monitoring and control
  - PipelineEvent model and migration for pipeline event persistence
requires:
  []
affects:
  []
key_files:
  - backend/pipeline/stages.py
  - backend/routers/pipeline.py
  - backend/models.py
  - backend/schemas.py
  - alembic/versions/004_pipeline_events.py
  - frontend/src/pages/AdminPipeline.tsx
  - frontend/src/api/public-client.ts
  - frontend/src/App.tsx
  - frontend/src/App.css
key_decisions:
  - Fixed _emit_event to use _get_sync_session() with explicit try/finally close instead of nonexistent _get_session_factory()
  - Restarted chrysopedia-web-8096 nginx container to resolve stale DNS after API container rebuild
  - Used grid layout for video rows with info/meta/actions columns
  - Worker status auto-refreshes every 15s via setInterval
  - JsonViewer component for collapsible JSON payload display
patterns_established:
  - Pipeline event instrumentation pattern: _emit_event(video_id, stage, event_type, payload) persists to pipeline_events table via sync session
  - Admin API pattern: /admin/pipeline/* namespace for pipeline management endpoints with Celery inspect integration
observability_surfaces:
  - pipeline_events table captures per-stage start/complete/error events with JSONB payloads
  - GET /admin/pipeline/worker-status exposes Celery worker health, active tasks, and pool size
  - GET /admin/pipeline/events/{video_id} provides paginated event timeline for debugging pipeline runs
drill_down_paths:
  - .gsd/milestones/M005/slices/S01/tasks/T01-SUMMARY.md
  - .gsd/milestones/M005/slices/S01/tasks/T02-SUMMARY.md
  - .gsd/milestones/M005/slices/S01/tasks/T03-SUMMARY.md
duration: ""
verification_result: passed
completed_at: 2026-03-30T08:37:43.367Z
blocker_discovered: false
---

# S01: Pipeline Admin Dashboard

**Built a full pipeline management admin page at /admin/pipeline with video list, status monitoring, retrigger/revoke controls, event log with token usage, collapsible JSON responses, and live worker status.**

## What Happened

Three tasks delivered the pipeline admin dashboard end-to-end:

**T01 — Pipeline Event Instrumentation:** The PipelineEvent model, Alembic migration 004, and instrumentation hooks (`_emit_event`, `_make_llm_callback`) already existed from a prior pass but had critical syntax errors — missing triple-quote docstrings, unquoted string literals, and a reference to nonexistent `_get_session_factory()`. Fixed all issues, replaced with existing `_get_sync_session()` pattern. Verified events persist to the `pipeline_events` table (24 real events from prior runs confirmed).

**T02 — Admin Pipeline API Endpoints:** Five endpoints in `backend/routers/pipeline.py`:
- `GET /admin/pipeline/videos` — Video list with processing_status, event_count, total_tokens_used, last_event_at
- `POST /admin/pipeline/trigger/{video_id}` — Retrigger pipeline for a video
- `POST /admin/pipeline/revoke/{video_id}` — Pause/stop via Celery revoke
- `GET /admin/pipeline/events/{video_id}` — Paginated event log with full payload
- `GET /admin/pipeline/worker-status` — Active/reserved tasks from Celery inspect

All endpoints verified returning correct JSON. Hit a 502 issue caused by nginx stale DNS after the API container was rebuilt in T01 — resolved by restarting the web container.

**T03 — Frontend Admin Page:** `AdminPipeline.tsx` at `/admin/pipeline` with:
- Video list table with processing status badges and creator names
- Retrigger and revoke action buttons per video
- Expandable event log timeline per video showing stage, event_type, token counts, model names
- Collapsible JSON viewer (`JsonViewer` component) for event payloads
- Worker status indicator with auto-refresh every 15 seconds
- Route and nav link wired into App.tsx

Built with zero TypeScript errors, deployed to production, browser-verified with 3 real videos and 24+ events.

## Verification

All slice-level verification checks pass:

1. `GET /admin/pipeline/videos` → 200, returns 3 videos with status, event_count, total_tokens_used (via ssh ub01 curl)
2. `GET /admin/pipeline/worker-status` → 200, returns online:true with 1 worker
3. `GET /admin/pipeline/events/{video_id}?limit=3` → 200, returns paginated events with stage, event_type, payload JSONB
4. `docker exec chrysopedia-api alembic upgrade head` → already at head (migration 004 applied)
5. `docker exec chrysopedia-api python -c 'from models import PipelineEvent; print("OK")'` → OK
6. Frontend at `/admin/pipeline` returns HTTP 200
7. All 7 containers healthy (db, redis, qdrant, ollama, api, worker, web-8096)
8. Frontend built with zero TypeScript errors

## Requirements Advanced

None.

## Requirements Validated

None.

## New Requirements Surfaced

None.

## Requirements Invalidated or Re-scoped

None.

## Deviations

T01 became a syntax-fix task rather than writing new code — the model, migration, and instrumentation already existed but had broken syntax. The `_get_session_factory()` reference was replaced with the existing `_get_sync_session()` pattern.

## Known Limitations

- `total_tokens_used` shows 0 for all videos — the LLM callback instrumentation is wired but no pipeline runs have occurred since the fix, so no token data has been captured yet. The next pipeline execution will populate token counts.
- Retrigger and revoke buttons are wired to the API but not tested with an active pipeline run in this slice (would require triggering a real LLM pipeline execution).

## Follow-ups

None.

## Files Created/Modified

- `backend/pipeline/stages.py` — Fixed _emit_event and _make_llm_callback syntax errors, replaced _get_session_factory() with _get_sync_session()
- `backend/routers/pipeline.py` — New router with 5 admin pipeline endpoints (videos, trigger, revoke, events, worker-status)
- `backend/models.py` — PipelineEvent model (previously added, verified working)
- `backend/schemas.py` — Pydantic schemas for pipeline admin responses
- `alembic/versions/004_pipeline_events.py` — Migration creating pipeline_events table (previously added, verified at head)
- `frontend/src/pages/AdminPipeline.tsx` — New admin pipeline page with video table, event log, JSON viewer, worker status
- `frontend/src/api/public-client.ts` — API client functions for pipeline admin endpoints
- `frontend/src/App.tsx` — Added /admin/pipeline route and nav link
- `frontend/src/App.css` — Themed CSS for pipeline admin page components
