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This is a recap of the top 10 posts on Hacker News on Jan 21, 2026.Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights(00:00) - Intro (00:21) - California is free of drought for the first time in 25 years (01:26) - Unconventional PostgreSQL Optimizations (02:34) - Anthropic's original take home assignment open sourced (03:36) - Ask HN: Do you have any evidence that agentic coding works? (04:43) - cURL removes bug bounties (05:47) - The Unix Pipe Card Game (06:37) - Instabridge has acquired Nova Launcher (07:44) - IPv6 is not insecure because it lacks a NAT (08:56) - The challenges of soft delete (10:06) - Outro California is free of drought for the first time in 25 yearshttps://www.latimes.com/california/story/2026-01-09/california-has-no-areas-of-dryness-first-time-in-25-yearshttps://news.ycombinator.com/item?id=46698660Unconventional PostgreSQL Optimizationshttps://hakibenita.com/postgresql-unconventional-optimizationshttps://news.ycombinator.com/item?id=46692116Anthropic's original take home assignment open sourcedhttps://github.com/anthropics/original_performance_takehomehttps://news.ycombinator.com/item?id=46700594Ask HN: Do you have any evidence that agentic coding works?https://news.ycombinator.com/item?id=46691243cURL removes bug bountieshttps://etn.se/index.php/nyheter/72808-curl-removes-bug-bounties.htmlhttps://news.ycombinator.com/item?id=46701733The Unix Pipe Card Gamehttps://punkx.org/unix-pipe-game/https://news.ycombinator.com/item?id=46694124Instabridge has acquired Nova Launcherhttps://novalauncher.com/nova-is-here-to-stayhttps://news.ycombinator.com/item?id=46696357IPv6 is not insecure because it lacks a NAThttps://www.johnmaguire.me/blog/ipv6-is-not-insecure-because-it-lacks-nat/https://news.ycombinator.com/item?id=46696303The challenges of soft deletehttps://atlas9.dev/blog/soft-delete.htmlhttps://news.ycombinator.com/item?id=46698061 What is Hacker News Highlights? Daily overview of the Top 10 Hacker News posts. Post and comment summarization by AI.