motief/thoughts/ledgers/CONTINUITY_ses_2bed.md

session	updated
ses_2bed	2026-03-31T00:07:06.270Z

Session Summary

Goal

Generate and update the project's mindmodel, then debug why the trajectories plot is not showing in the Explorer app.

Constraints & Preferences

• Keep changes minimal and reversible
• Diagnostics must be opt-in (EXPLORER_DEBUG_TRAJECTORIES env var)
• Helpers must be import-safe and pure
• Use uv for local/CI runs (not pip directly)
• Follow existing project conventions (snake_case, PascalCase for classes, dataclass Config)

Progress

Done

• Generated mindmodel via mm-constraint-writer agent → wrote 9 files to .mindmodel/:
  • manifest.yaml, stack/stack.yaml, architecture/architecture.yaml, conventions/conventions.yaml, domain/domain-glossary.yaml, patterns/patterns.yaml, anti-patterns/anti-patterns.yaml, dependencies/dependencies.yaml, constraints/README.md
  • Top anti-pattern: explorer_helpers.py:compute_party_coords party_map key/value mismatch hypothesis (later invalidated)
• Ran 7 parallel analysis agents covering: stack detection, dependency mapping, convention extraction, domain extraction, code clustering, pattern discovery, anti-pattern detection
• Investigated the trajectories "not showing" bug systematically:
  • Read explorer.py (2948 lines), explorer_helpers.py (297 lines), analysis/political_axis.py (695 lines), analysis/trajectory.py (297 lines), analysis/visualize.py, scripts/diagnose_trajectories_cli.py
  • Ran DB queries confirming: svd_vectors has entity_type values mp and motion only (NO party rows), entity_type='party' count = 0
  • Ran diagnose_trajectories_cli.py — all 4 scenarios produced party_map_count: 0
  • CRITICAL FINDING: The diagnostic script was artificially passing load_party_map_ret={} (empty dict) in ALL scenarios, creating a false alarm
  • Tested with real data confirming party_map has 1036 entries (NOT empty)
  • Confirmed party centroids ARE computed correctly: CDA, D66, VVD, PVV, SP, GroenLinks-PvdA etc. all produce traces
  • Annual view (12 windows): CDA, D66, VVD traces visible
  • Quarterly view (33 windows): 6 party traces
  • select_trajectory_plot_data returns trace_count=6 with real data (not 0)
• Identified root cause of the diagnostic JSON confusion: The 2026-03-31-trajectories-diagnostics.json was created by diagnose_trajectories_cli.py which passes load_party_map_ret={} artificially, not reflecting real production behavior

Key Decisions

• The trajectories plot DOES work correctly: The diagnostic JSON showing party_map_count: 0 was caused by the diagnostic script itself (passing empty party_map), NOT a production bug
• No production code changes needed for the core trajectories functionality — it's working as designed
• The diagnostic script scripts/diagnose_trajectories_cli.py needs fixing to use real data paths instead of mocking everything to empty
• The anti-pattern detected (compute_party_coords party_map mismatch) was a false alarm — entity_ids in svd_vectors are ALL MP names, never party names (no entity_type='party' rows exist)

Next Steps

1. Fix scripts/diagnose_trajectories_cli.py to use real data paths (data/motions.db) and real load_party_map / load_positions calls instead of mocking everything to empty
2. Re-run the fixed diagnostic script to produce a correct trajectories-diagnostics.json artifact
3. Update the mindmodel manifest to reflect that trajectories work correctly (remove the incorrect anti-pattern about party_map mismatch — it doesn't apply since no party-level entity_ids exist in svd_vectors)
4. Consider writing an integration test that calls select_trajectory_plot_data with real DB data and asserts trace_count > 0 (as the design doc planned but wasn't implemented)
5. Decide what to do with EXPLORER_FORCE_SHOW_TRAJECTORIES=1 — currently a no-op because party centroids always compute; could be useful for debugging or removed as dead code

Critical Context

• Project type: Dutch political voting compass (Stemwijzer), Python ≥3.13, Streamlit, DuckDB
• DB state: mp_metadata has 798 rows with party info; svd_vectors has 73,165 rows with entity_type mp (8,219) and motion (65,000+), zero entity_type='party' rows
• Window IDs: 41 windows (annual + quarterly), get_uniform_dim_windows returns 33 that pass the dim≥25 AND cnt≥10 filter
• run_app() hardcodes window_size = "annual" (not quarterly) — so the default view uses 12 windows with 3 default party traces (CDA, D66, VVD)
• Mismatch between mp_metadata names and svd_vectors entity_ids: ~6 MPs in annual view have name variants that don't match party_map (e.g., De Pater-Postma, W.L. vs Pater-Postma de, W.L.), but this is minor (6 out of 612 = ~1%)
• Existing diagnostic JSON at thoughts/shared/diagnostics/2026-03-31-trajectories-diagnostics.json shows party_map_count: 0 — this is a red herring from the diagnostic script, NOT real production behavior

File Operations

Read

• /home/sgeboers/Projects/stemwijzer/.mindmodel/manifest.yaml
• /home/sgeboers/Projects/stemwijzer/explorer.py (2948 lines, lines 1–50, 210–329, 414–443, 486–535, 584–643, 641–720, 1297–1315, 1601–1800, 1800–1919, 1919–1998, 1998–2057, 210–329, 2868–2947)
• /home/sgeboers/Projects/stemwijzer/explorer_helpers.py (full, 297 lines)
• /home/sgeboers/Projects/stemwijzer/analysis/political_axis.py (full, 695 lines)
• /home/sgeboers/Projects/stemwijzer/analysis/trajectory.py (full, 297 lines)
• /home/sgeboers/Projects/stemwijzer/analysis/visualize.py (lines 30–109 for _load_party_map)
• /home/sgeboers/Projects/stemwijzer/scripts/diagnose_trajectories_cli.py (full, 118 lines)
• /home/sgeboers/Projects/stemwijzer/tests/test_build_trajectories_tab_fallback.py (full, 61 lines)
• /home/sgeboers/Projects/stemwijzer/thoughts/shared/designs/2026-03-31-diagnose-no-plot-trajectories-design.md
• /home/sgeboers/Projects/stemwijzer/thoughts/shared/plans/2026-03-30-diagnose-no-plot-trajectories.md

Modified

• (none yet — verified trajectories work correctly via DB queries and Python tests)