The Rewrite Kept Every Bug
Four non-trivial defects appear at near-identical line numbers in both builds of the same product - a ground-up rewrite by the same authors relocated them rather than finding any.
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The Refactor That Stopped Halfway
Trill's last commit built a complete domain-event pipeline - dispatcher, mapper, handlers - and migrated one of the two command handlers onto it. The other still constructs its aggregate directly, so one domain event is never raised and a reputation gate can never fire.
Sixteen Concepts, Copied Once
When Postsale was carved out of Sales, sixteen types came with it - and every place the twins differ marks a decision the extraction forced, including one base class that stopped draining and a repository that silently depends on it.
A Smell Audit With Prescriptions
A refactoring.guru walk through Pacco's real lines - a flags-enum search that can never match, twin guards, a dead password check, mappers that return null, and an Id that is never assigned - each smell named and each paired with the technique that cures it.
Two Fix Scripts and What They Confess
Refactoring KC Star V6's monolith into V7's subfolders broke the schema - so badly it took two passes of fix scripts to repair. Missing columns, duplicate triggers, a trigger literally named _Corrected, and a live test INSERT embedded in a migration. What the scars teach.