A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe
Barman Replacing pgbackrest: I Migrated My Postgres Backups in Production and Here's What I Found The weekend I migrated from Vercel to Railway — the same one I mentioned when I talked about cold starts — I spent nearly twelve hours reading Postgres logs I'd never had to read that seriously before. It wasn't a tutorial. It was real production, real data, and the underlying question was always th