How to Document Database Schemas Effectively for Engineering Teams

A structured approach to database schema documentation recommends three core layers: clear naming conventions, inline column comments, and a visual ER diagram. Naming best practices include using snake_case, plural table names, descriptive column names, and prefixes like is_ or has_ for booleans to reduce the need for additional explanation. Database-level comments should capture non-obvious details such as accepted values, data formats, and business rules like soft-delete policies. Teams are advised to maintain a SCHEMA.md file in their repository and update it as part of every pull request that modifies the database. The recommended toolset scales with team size, ranging from simple markdown files for small teams to dedicated data catalogues like DataHub or dbt docs for organisations with 15 or more engineers.
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