Your app works great with 1 user. Launch day brings 1,000 at once, and that's when it falls over. Paste this into Claude Code in your project: "Load-test my app before launch. 1. Install k6 2. Read my routes and write a realistic test: users sign up, log in, browse and do the main action 3. Run it against my local or staging server, never production, ramping from 10 to 100 to 500 to 1,000 users 4. Tell me the exact point where responses pass 1 second or errors start 5. Find the cause: slow queries, missing indexes, no caching, the same data loaded over and over 6. Fix the top 3, run the test again and show me before vs after" Find your breaking point before your users do.