This past week I found and fixed a bug that happens once in 40,000 transactions working with Claude Code - Opus 4.6. Our legacy app was designed around 2008 and has had zillions of band aids added since then. Nobody (~700 person company) has been able to reliably reproduce this issue to confidently claim that they know what the cause is and how to definitively fix it. That all changed yesterday. I spent today writing up summaries that were shared far and wide. My wizard status is yet again renewed.