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title	category
Tech Stack	stack

Tech Stack

Runtime & Language

Python >=3.13

Web Framework

Streamlit - Multi-page app with Home, Stemwijzer, Explorer pages

Data Layer

DuckDB - Embedded OLAP database
- Tables: motions, mp_votes, svd_vectors, fused_embeddings, embeddings, user_sessions, party_results, mp_metadata
ibis - ORM (referenced but DuckDB-native implementation used)

AI / LLM

OpenRouter - API abstraction for AI providers
QWEN - Primary model
- Embeddings: qwen/qwen3-embedding-4b
- Chat: qwen/qwen-2.5-72b-instruct
requests - HTTP client (not raw openai)

ML / Analytics

scikit-learn - KMeans clustering, cosine_similarity, StandardScaler
scipy - SVD (scipy.linalg.svd), spatial.procrustes
umap-learn - Dimensionality reduction (optional, graceful fallback to SVD)
numpy - Numerical computing

Visualization

Plotly - Interactive charts (go.Figure, _DummyTrace fallback)
matplotlib - Static plotting (optional)

HTTP & Parsing

requests - Session pooling, retry with backoff
beautifulsoup4 - HTML parsing
lxml - XML/HTML processing

Key Source Files

File	Purpose
`database.py`	MotionDatabase singleton, DuckDB connection, 9-table schema
`explorer.py`	Explorer page with 4 tabs (Motion, MP, Party, Evolution)
`explorer_helpers.py`	Pure helper functions, Plotly chart builders
`analysis/`	SVD pipeline, UMAP projection, clustering
`pipeline/`	Data fetch, transform, store pipeline
`pages/1_Stemwijzer.py`	Quiz page
`pages/2_Explorer.py`	Explorer page
`config.py`	Dataclass Config pattern
`ai_provider.py`	OpenRouter API wrapper with retry
`api_client.py`	TweedeKamer OData API client

Singleton Instances

Module	Instance	Type
`database.py`	`db`	`MotionDatabase`
`config.py`	`config`	`Config` (dataclass)
`config.py`	`PARTY_COLOURS`	`dict[str, str]`

Environment

Python >=3.13
Environment variables via .env (DB path, API keys)
No .env values in constraint files (security)