Run embedded OLAP SQL on Parquet/CSV locally; configure memory and thread limits; attach remote files safely; export with COPY; avoid multi-writer locks and treating DuckDB as a production server database.
Install
npx skills add alivirgo/Major-AI-Skills --skill duckdbnpx skills add alivirgo/Major-AI-Skills --skill duckdb -a claude-code -gnpx skills add alivirgo/Major-AI-Skills --skill duckdb -a codex -ggemini skills install https://github.com/alivirgo/Major-AI-Skills.git --path skills/duckdbgh skill install alivirgo/Major-AI-Skills duckdbgit clone --depth 1 https://github.com/alivirgo/Major-AI-Skills /tmp/alivirgo__Major-AI-Skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/alivirgo__Major-AI-Skills/skills/duckdb ~/.claude/skills/duckdb # Claude Code
cp -R /tmp/alivirgo__Major-AI-Skills/skills/duckdb ~/.agents/skills/duckdb # Codex, Cursor, Gemini CLI, Copilot, OpenCode