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The query API returns [polars](https://pola.rs) DataFrames so you can join with any external dataset.\n\n## Setup\n\nRequires [uv](https://github.com/astral-sh/uv).\n\n```bash\nuv sync\n```\n\n## Ingest game history\n\n```bash\nuv run python -m chess_stats.ingest --username nirum\n```\n\nOptions:\n- `--username` — chess.com username (default: `nirum`)\n- `--data-dir` — where to store parquet files (default: `data/`)\n- `--time-classes` — game types to include (default: `rapid blitz`)\n\nThe first run fetches all available months. Subsequent runs only fetch new months (incremental). The current calendar month is always re-fetched in case new games were played.\n\n## Query API\n\n```python\nfrom chess_stats import GameDB\n\ndb = GameDB(\"data\")\n\n# Summary\ndb.summary()\n\n# All games as a polars DataFrame\ndb.games()\ndb.games(time_class=\"rapid\", color=\"white\", result=\"win\")\ndb.games(start_date=\"2024-01-01\", end_date=\"2024-12-31\")\n\n# Aggregated views\ndb.rating_history(time_class=\"rapid\")\ndb.performance_by_hour()\ndb.performance_by_day()\ndb.opening_stats(min_games=10)\n```\n\n## Tutorial notebook\n\n```bash\nuv run jupyter notebook notebooks/tutorial.ipynb\n```\n\nCovers: summary stats, rating trajectory, win rate by hour/day, opening analysis, and a template for joining with health data.\n\n## Data\n\nParquet files are written to `data/` (git-ignored):\n- `data/games.parquet` — one row per game\n- `data/fetch_log.parquet` — tracks which months have been fetched\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnirum%2Fchess_stats","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnirum%2Fchess_stats","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnirum%2Fchess_stats/lists"}