Database Schema Documenter

Reads SQL DDL files from PostgreSQL, MySQL, or SQLite and generates comprehensive Markdown documentation. Includes a complete Python script (zero dependencies) that produces table-by-table column docs, Mermaid ER diagrams showing all relationships, index coverage analysis, and a schema audit that flags missing FK indexes, wide tables, and nullable foreign keys. Drop it into any repo and get living documentation your team will actually read. Works with pg_dump output, raw .sql files, or sqlite3 .schema exports.