Unearthing DRY Violations from Hotspot Data with lumitrace

Note: I had Claude Code write the third installment of their experience report using lumitrace. Note: Here are the costs for this session, tallied from Claude Code's logs. This includes the cost of writing this article as well: 83 turns, 7.8M in / 28.9K out, $17.20 Note: They write as if they gradually learned how to use it, but I'm pretty sure they just looked at the schema from the start and did whatever they wanted. In the first post, I removed redundant.to_s calls. In the second, I did O(n)-to-O(1) algorithm improvements and filled coverage gaps. The low-hanging fruit was mostly picked.