Month: 2026-03 Overview: Focused on improving developer experience and reducing ambiguity in Rails migrations by clarifying ActiveRecord primary key handling. The month centered on documentation enhancements rather than feature parity changes, with a key emphasis on making it easier for contributors to understand and correctly define a custom primary key in Rails. Impact: Improved onboarding and developer confidence when defining custom primary keys; reduced risk of errors when redefining the 'id' column in migrations by presenting a clear, single-line guidance. Note: Work reflects a single, targeted documentation improvement within the rails/rails repository, aligned with ongoing efforts to improve documentation clarity and consistency.