---
id: S01
parent: M012
milestone: M012
provides:
  - Multi-token AND search across all metadata fields
  - partial_matches fallback for graceful degradation
  - Enriched Qdrant embeddings with creator names and tags
  - Reindex-all admin endpoint
  - SearchResponse schema with partial_matches field
requires:
  []
affects:
  - S02
key_files:
  - backend/search_service.py
  - backend/schemas.py
  - backend/routers/search.py
  - backend/pipeline/stages.py
  - backend/pipeline/qdrant_client.py
  - backend/routers/pipeline.py
  - frontend/src/api/public-client.ts
  - frontend/src/pages/SearchResults.tsx
  - frontend/src/App.css
  - backend/tests/test_search.py
key_decisions:
  - Multi-token AND logic: tokenize by whitespace, per-token OR across fields, AND all tokens (D023)
  - Qdrant embedding text enriched with creator_name + topic_tags, batch-resolved at stage start (D024)
  - partial_matches only triggers on multi-token queries with zero AND results
  - keyword_search returns dict with items + partial_matches instead of flat list
  - Defensive ?? [] on partial_matches for backward compatibility with old API responses
patterns_established:
  - Multi-token AND search: tokenize → per-token OR across fields → AND all tokens → partial_matches fallback on zero results
  - Batch-resolve related entity names at stage start to avoid N+1 during embedding loops
  - Reindex-all admin endpoint pattern for re-embedding after text composition changes
observability_surfaces:
  - Search endpoint logs token count, result counts, and whether partial_matches was triggered
  - Reindex-all endpoint logs dispatch count and per-video failures
drill_down_paths:
  - .gsd/milestones/M012/slices/S01/tasks/T01-SUMMARY.md
  - .gsd/milestones/M012/slices/S01/tasks/T02-SUMMARY.md
  - .gsd/milestones/M012/slices/S01/tasks/T03-SUMMARY.md
duration: ""
verification_result: passed
completed_at: 2026-04-01T06:23:31.587Z
blocker_discovered: false
---

# S01: Multi-Field Composite Search

**Search now tokenizes multi-word queries and AND-matches across all metadata fields (creator, title, tags, category, body), with partial_matches fallback UI when no exact cross-field match exists.**

## What Happened

Three tasks delivered end-to-end multi-field composite search:

**T01 — Backend multi-token AND logic.** Rewrote `SearchService.keyword_search()` from single-pattern ILIKE to a multi-token AND architecture. Each whitespace-delimited token generates OR conditions across entity fields (title, summary, topic_category, topic_tags via `array_to_string`, creator name via JOIN). All per-token conditions are AND'd so every token must hit at least one field. Added `partial_matches` fallback: when a multi-token query yields zero AND results, individual tokens are queried separately and results scored by coverage (top 5 returned). Extended `SearchResponse` schema with `partial_matches: list[SearchResultItem]`. Router threads partial_matches through to the response. 19 tests pass (13 updated for new return shape + 6 new).

**T02 — Enriched Qdrant embeddings.** Stage 6 embedding text now includes creator name and topic tags: technique pages embed as `'{creator_name} {title} {topic_category} {tags_joined} {summary}'`, key moments as `'{creator_name} {title} {summary}'`. Creator names batch-resolved at stage start to avoid N+1. Both Qdrant payload types now carry `creator_name`. Added `POST /admin/pipeline/reindex-all` endpoint to dispatch stage 6 for all complete videos after embedding text changes.

**T03 — Frontend partial_matches UI.** Added `partial_matches` to the frontend `SearchResponse` type with defensive `?? []` for backward compat. Three-way rendering: exact results → partial match fallback (muted header + grouped results) → empty state. `PartialMatchResults` component groups by type. CSS styling with reduced opacity on partial cards.

## Verification

All backend source files pass AST syntax validation. 19 search tests pass including 6 new tests for multi-token AND, cross-field matching, partial_matches, topic_tags matching, and creator genres. Frontend TypeScript compilation clean (`npx tsc --noEmit`). Vite production build succeeds (52 modules). All containers healthy on ub01 (API, worker, web, watcher, qdrant, db, redis, ollama).

## Requirements Advanced

- R005 — Search now handles multi-token queries with AND logic across all fields, improving relevance for composite queries
- R009 — Qdrant embeddings enriched with creator_name and topic_tags for better semantic search coverage
- R015 — Multi-token AND search reduces result noise, helping users find specific techniques faster

## Requirements Validated

None.

## New Requirements Surfaced

None.

## Requirements Invalidated or Re-scoped

None.

## Deviations

T02 added creator_name to technique_page Qdrant payload (plan only mentioned key_moment) — strictly additive. T01 used integration tests against PostgreSQL instead of curl against running API since deployed containers don't yet have the new code.

## Known Limitations

Running deployment on ub01 still serves old code — containers need rebuild+restart after merge to pick up multi-token search. Reindex-all endpoint must be called after deployment to re-embed with enriched text.

## Follow-ups

After deploy: rebuild containers on ub01, run `POST /admin/pipeline/reindex-all` to re-embed all content with creator names and tags. S02 (Sort Controls) depends on this slice.

## Files Created/Modified

- `backend/search_service.py` — Rewrote keyword_search to multi-token AND with cross-field matching, added _keyword_partial_matches fallback
- `backend/schemas.py` — Added partial_matches field to SearchResponse
- `backend/routers/search.py` — Thread partial_matches through to SearchResponse construction
- `backend/pipeline/stages.py` — Enriched stage 6 embedding text with creator_name and topic_tags, batch creator resolution
- `backend/pipeline/qdrant_client.py` — Added creator_name to technique_page and key_moment Qdrant payloads
- `backend/routers/pipeline.py` — Added POST /admin/pipeline/reindex-all endpoint
- `frontend/src/api/public-client.ts` — Added partial_matches to SearchResponse type
- `frontend/src/pages/SearchResults.tsx` — Added PartialMatchResults component and three-way rendering logic
- `frontend/src/App.css` — Added styles for partial match banner and muted result cards
- `backend/tests/test_search.py` — Updated 13 existing tests for new return shape, added 6 new tests for multi-token AND logic
