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+# Parliamentary Embedding Pipeline (Late Fusion) Implementation Plan
+
+Goal: Implement an MVP late-fusion pipeline that (1) extracts MP-level votes from the existing motions.voting_results JSON, (2) builds aligned SVD representations per time-window, (3) ensures text embeddings coverage, and (4) fuses SVD motion vectors with text embeddings into a fused_embeddings table — all using DuckDB and in-Python compute.
+
+Design reference: thoughts/shared/designs/2026-03-21-parliamentary-embedding-pipeline-design.md
+
+---
+
+## Dependency Graph
+
+```
+Batch 1 (parallel): 1.1, 1.2, 1.3, 1.4 [foundation - no deps]
+Batch 2 (parallel): 2.1, 2.2-spike, 2.3, 2.4, 2.5 [core - depends on batch 1]
+Batch 3 (parallel): 3.1, 3.2 [integration & CI - depends on batch 2]
+```
+
+---
+
+## Batch 1: Foundation (parallel)
+
+### Task 1.1: Add scientific dependencies
+- File to modify: pyproject.toml
+- Test: tests/test_pyproject_deps.py
+- Hours: 1.0 | Priority: high | Depends: none
+- Acceptance: scipy>=1.11, umap-learn>=0.5, plotly>=5.0 present in pyproject.toml
+
+### Task 1.2: Add migration file placeholders
+- Files to create: migrations/2026_03_21__create_mp_votes.sql, migrations/2026_03_21__create_mp_metadata.sql, migrations/2026_03_21__create_svd_vectors.sql, migrations/2026_03_21__create_fused_embeddings.sql
+- Test: tests/test_migration_pipeline_tables.py (follows existing pattern in tests/test_migration_embeddings.py)
+- Hours: 1.5 | Priority: high | Depends: none
+- Acceptance: Migration files exist; test applies them to temp DuckDB and asserts expected tables/columns
+
+### Task 1.3: Extend database.py with new tables + helpers
+- File to modify: database.py (_init_database + new helpers)
+- Test: tests/test_database_schema_and_helpers.py
+- Hours: 3.5 | Priority: highest | Depends: 1.2
+- Helpers to add: mp_votes_exists_for_motion, insert_mp_vote, upsert_mp_metadata, store_svd_vector, store_fused_embedding
+- Acceptance: Tables created, helpers tested against temp DuckDB via round-trip insert/select; logging not prints
+
+### Task 1.4: Add test fixtures
+- File to create: tests/fixtures/sample_voting_results.json (5–10 motions with mixed party + MP keys)
+- Hours: 0.5 | Priority: medium | Depends: none
+
+---
+
+## Batch 2: Core Pipeline (parallel, depends on Batch 1)
+
+### Task 2.1: pipeline/extract_mp_votes.py
+- Extract MP rows from voting_results JSON; comma-in-key = MP name, else = party (skip party rows)
+- Test: tests/test_extract_mp_votes.py
+- Hours: 4.0 | Priority: highest | Depends: 1.3, 1.4
+- Acceptance: Idempotent; correct MP rows inserted; party keys ignored; re-run produces no duplicates
+
+### Task 2.2 (spike): pipeline/spike_fetch_kamerlid.py
+- Validate whether OData /Kamerlid endpoint provides party affiliation + tenure dates
+- Test: tests/test_spike_fetch_kamerlid.py (monkeypatched network)
+- Hours: 2.0 | Priority: highest (spike) | Depends: 1.3
+- Acceptance: Spike result documented; test asserts field extraction from mocked response; full fetch (2.2b) scheduled or fallback heuristic decided
+
+### Task 2.3: pipeline/text_pipeline.py
+- Ensure every motion has a text embedding; delegates to existing ai_provider.get_embedding
+- Text priority: body_text > layman_explanation > description
+- Test: tests/test_text_pipeline.py (monkeypatch ai_provider)
+- Hours: 3.0 | Priority: high | Depends: 1.3, 1.1
+
+### Task 2.4: pipeline/svd_pipeline.py
+- Per-window: build sparse MP×Motion csr_matrix → scipy svds → Procrustes alignment → store svd_vectors
+- CRITICAL: enforce k < min(n_mps, n_motions); reduce k dynamically if needed; test this path
+- Procrustes: log disparity score; flag HIGH_DISPARITY if overlap < 30%
+- Test: tests/test_svd_pipeline.py (synthetic 5×6 matrix, k reduction test, alignment test)
+- Hours: 6.0 | Priority: highest | Depends: 1.3
+
+### Task 2.5: pipeline/fusion.py
+- For each motion in window: fetch SVD motion vector + text embedding → concatenate → store fused_embeddings
+- Skip and log if either vector missing
+- Test: tests/test_fusion.py (verify vector length = svd_dims + text_dims)
+- Hours: 3.0 | Priority: high | Depends: 2.3, 2.4
+
+---
+
+## Batch 3: Integration & CI (depends on Batch 2)
+
+### Task 3.1: tests/integration/test_pipeline_end_to_end.py
+- Apply migrations → seed motions → monkeypatch ai_provider → run extract → SVD → text → fuse
+- Assert fused_embeddings rows and vector dimensions
+- Hours: 4.0 | Priority: highest | Depends: 2.1, 2.3, 2.4, 2.5
+- Use numpy.random.seed(0); dataset ≤50 motions for CI speed
+
+### Task 3.2: tests/conftest.py (fixtures + test helpers)
+- Fixtures: temp_duckdb_path, apply_migrations, monkeypatch_ai_provider, mock_odata_client
+- Add tests/README.md section on monkeypatching strategy
+- Hours: 2.0 | Priority: high | Depends: 1.3
+
+---
+
+## Migration filenames
+- migrations/2026_03_21__create_mp_votes.sql — columns: id, motion_id, mp_name, party, vote, date, created_at
+- migrations/2026_03_21__create_mp_metadata.sql — columns: mp_name (PK), party, entry_date, exit_date, source_id
+- migrations/2026_03_21__create_svd_vectors.sql — columns: window_id, entity_type, entity_id, vector, model, created_at
+- migrations/2026_03_21__create_fused_embeddings.sql — columns: motion_id, window_id, vector, svd_dims, text_dims, created_at
+
+---
+
+## CI / Test instructions
+
+- Run all tests: pytest -q
+- Run unit tests only: pytest -q tests/ --ignore=tests/integration
+- Run integration test: pytest -q tests/integration/test_pipeline_end_to_end.py
+- Monkeypatch ai_provider.get_embedding with a function returning [0.01]*16 for fast tests
+- Monkeypatch OData/API calls via requests-mock or monkeypatch.setattr on TweedeKamerAPIClient methods
+- Temp DuckDB: use pytest tmp_path fixture; apply migration SQL files at test setup
+- Determinism: numpy.random.seed(0) in all tests calling scipy/numpy
+
+---
+
+## 3-Sprint Schedule (2-week sprints)
+
+Sprint 1 (Weeks 1–2): Tasks 1.1, 1.2, 1.3, 1.4, 2.2-spike
+- Deliverables: DB schema extended, migrations present, spike result documented
+
+Sprint 2 (Weeks 3–4): Tasks 2.1, 2.3, 2.4, 2.5 (+ 2.2b if spike succeeded)
+- Deliverables: All pipeline modules implemented with passing unit tests
+
+Sprint 3 (Weeks 5–6): Tasks 3.1, 3.2
+- Deliverables: Integration test passing end-to-end; CI docs written
+
+---
+
+## Key assumptions
+
+1. Vectors stored as JSON (consistent with existing embeddings table)
+2. Use existing ai_provider.get_embedding for text embeddings — no new model calls
+3. SVD k enforced dynamically (k < min(n_mps, n_motions)); tests cover this path
+4. Procrustes rotation matrices NOT persisted in MVP (aligned vectors stored directly)
+5. mp_metadata: try OData spike first; fallback to majority-party heuristic if unavailable
+6. Default quarterly time windows, but parameterized for Annual validation in Sprint 2
+7. All new helpers go into existing database.py MotionDatabase class (not a new module)
+8. Analysis/visualization (UMAP, Plotly plots) is a follow-up sprint, NOT included here
+
+## Open questions
+
+1. Does OData /Kamerlid expose party affiliation + tenure dates? (Sprint 1 spike answers this)
+2. Should Procrustes rotation matrices be persisted? (MVP: no; revisit after)
+3. Time-window granularity: annual first for stability validation, then quarterly?
+4. Production k value for SVD: default 50 but must be validated against real data sizes
+5. Who runs migrations in production, and how? (Out of scope for MVP)