---
id: T03
parent: S03
milestone: M001
provides: []
requires: []
affects: []
key_files: ["backend/pipeline/embedding_client.py", "backend/pipeline/qdrant_client.py", "backend/pipeline/stages.py"]
key_decisions: ["stage6 uses max_retries=0 and catches all exceptions — embedding is a non-blocking side-effect that can be regenerated later", "EmbeddingClient returns empty list on any API error so callers don't need try/except", "QdrantManager generates random UUIDs for point IDs to avoid conflicts across re-indexing"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "All 9 verification checks passed. Three task-level import checks (EmbeddingClient, QdrantManager, stage6_embed_and_index) exit 0. Full slice-level verification (Settings defaults, schemas, LLMClient, celery_app, grep for openai/qdrant-client) all pass. Celery task registry shows all 6 tasks registered. Structural validation confirmed sync openai.OpenAI usage, config-driven dimensions, idempotent collection creation, non-blocking error handling, and metadata payloads."
completed_at: 2026-03-29T22:39:01.970Z
blocker_discovered: false
---

# T03: Created sync EmbeddingClient, QdrantManager with idempotent collection management and metadata-rich upserts, and wired stage6_embed_and_index into the Celery pipeline chain as a non-blocking side-effect stage

> Created sync EmbeddingClient, QdrantManager with idempotent collection management and metadata-rich upserts, and wired stage6_embed_and_index into the Celery pipeline chain as a non-blocking side-effect stage

## What Happened
---
id: T03
parent: S03
milestone: M001
key_files:
  - backend/pipeline/embedding_client.py
  - backend/pipeline/qdrant_client.py
  - backend/pipeline/stages.py
key_decisions:
  - stage6 uses max_retries=0 and catches all exceptions — embedding is a non-blocking side-effect that can be regenerated later
  - EmbeddingClient returns empty list on any API error so callers don't need try/except
  - QdrantManager generates random UUIDs for point IDs to avoid conflicts across re-indexing
duration: ""
verification_result: passed
completed_at: 2026-03-29T22:39:01.970Z
blocker_discovered: false
---

# T03: Created sync EmbeddingClient, QdrantManager with idempotent collection management and metadata-rich upserts, and wired stage6_embed_and_index into the Celery pipeline chain as a non-blocking side-effect stage

**Created sync EmbeddingClient, QdrantManager with idempotent collection management and metadata-rich upserts, and wired stage6_embed_and_index into the Celery pipeline chain as a non-blocking side-effect stage**

## What Happened

Created backend/pipeline/embedding_client.py with an EmbeddingClient class using sync openai.OpenAI for /v1/embeddings calls. The embed() method gracefully handles connection, timeout, and API errors by returning an empty list, and validates vector dimensions against settings.embedding_dimensions. Created backend/pipeline/qdrant_client.py with QdrantManager wrapping sync QdrantClient. ensure_collection() is idempotent (checks collection_exists before creating with cosine distance). upsert_technique_pages() and upsert_key_moments() build PointStruct objects with full metadata payloads and upsert them, catching all Qdrant errors without re-raising. Added stage6_embed_and_index Celery task to stages.py that loads KeyMoments and TechniquePages for a video, embeds their text, and upserts to Qdrant. Uses max_retries=0 and catches all exceptions — embedding failures never fail the pipeline. Updated run_pipeline to include stage6 in both chain paths.

## Verification

All 9 verification checks passed. Three task-level import checks (EmbeddingClient, QdrantManager, stage6_embed_and_index) exit 0. Full slice-level verification (Settings defaults, schemas, LLMClient, celery_app, grep for openai/qdrant-client) all pass. Celery task registry shows all 6 tasks registered. Structural validation confirmed sync openai.OpenAI usage, config-driven dimensions, idempotent collection creation, non-blocking error handling, and metadata payloads.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd backend && python -c "from pipeline.embedding_client import EmbeddingClient; print('embed ok')"` | 0 | ✅ pass | 400ms |
| 2 | `cd backend && python -c "from pipeline.qdrant_client import QdrantManager; print('qdrant ok')"` | 0 | ✅ pass | 400ms |
| 3 | `cd backend && python -c "from pipeline.stages import stage6_embed_and_index; print('stage6 ok')"` | 0 | ✅ pass | 500ms |
| 4 | `cd backend && python -c "from config import Settings; s = Settings(); print(s.llm_api_url, s.qdrant_url, s.review_mode)"` | 0 | ✅ pass | 300ms |
| 5 | `cd backend && python -c "from pipeline.schemas import SegmentationResult, ExtractionResult, ClassificationResult, SynthesisResult; print('schemas ok')"` | 0 | ✅ pass | 300ms |
| 6 | `cd backend && python -c "from pipeline.llm_client import LLMClient; print('client ok')"` | 0 | ✅ pass | 300ms |
| 7 | `cd backend && python -c "from worker import celery_app; print(celery_app.main)"` | 0 | ✅ pass | 400ms |
| 8 | `grep -q 'openai' backend/requirements.txt && grep -q 'qdrant-client' backend/requirements.txt` | 0 | ✅ pass | 50ms |
| 9 | `cd backend && python -c "from worker import celery_app; tasks = [t for t in celery_app.tasks if 'stage' in t or 'pipeline' in t]; print(tasks)"` | 0 | ✅ pass | 400ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `backend/pipeline/embedding_client.py`
- `backend/pipeline/qdrant_client.py`
- `backend/pipeline/stages.py`


## Deviations
None.

## Known Issues
None.
