<div><img src="/assets/thumbnails/20220525-common-db-schema-change-mistakes thumbnail.jpg" alt="Common DB schema change mistakes"/><div><small>'rake db:migrate' – a command known to any Ruby developer. But how many times did we step on the same rake?</small></div></div>
<p>In his article <a href="https://hakibenita.com/postgresql-unknown-features">"Lesser Known PostgreSQL Features"</a>, <a href="https://twitter.com/be haki">@be haki</a> describes 18 Postgres features many people don't know. I enjoyed that article, and it inspired me to write about "anti-features" – things that everyone should avoid when working in probably the riskiest field of application development – so-called "schema migrations".</p>
<p>This is one of my favorite topics in the field of relational databases. We all remember how MongoDB entered