TCH SY System Design Notes · Stackademic 10 Hard Lessons I Learned the Expensive Way About Production Databases in 2026 I’ve killed production multiple times with bad SQL. These are the scars — and the exact fixes that still save me.
TCH SY System Design Notes · AWS in Plain English Redis Is Lying to You — 8 Production Nightmares I’ve Fixed in 2026 It says “memory used: 68%”. Reality: your users are getting stale data and the node is about to die.
