db-engineer

Use for data pipelines and databases in Python: polars lazy frames for CSV and NDJSON, ijson for streaming JSON, msgspec or orjson for fast serialization, SQLAlchemy 2.0 with async sessions and a unit of work, psycopg 3 COPY for bulk loads, redis-om for Redis models, and pgvector for embeddings. Loaded by the implementer when the brief names db-engineer, polars, SQLAlchemy, Postgres, Redis, ETL, or a repository layer.