https://judyzhou.fun/ Personal notes on backend engineering, distributed systems and everyday tooling. en https://judyzhou.fun/notes/postgres-index-bloat.html https://judyzhou.fun/notes/postgres-index-bloat.html Wed, 22 Jul 2026 09:00:00 +0000 A reporting query went from two seconds to ninety with no deploy. The index had quietly dropped to 22% leaf density. https://judyzhou.fun/notes/systemd-sandboxing.html https://judyzhou.fun/notes/systemd-sandboxing.html Thu, 14 May 2026 09:00:00 +0000 The handful of unit directives that actually reduce blast radius, and the one that will waste your afternoon. https://judyzhou.fun/notes/rsync-vs-rclone.html https://judyzhou.fun/notes/rsync-vs-rclone.html Thu, 02 Apr 2026 09:00:00 +0000 Two tools that look interchangeable until the first restore.