Debugging a Memory Crash in My Next.js 15 App on Render's Free Tier

For weeks, my Next.js 15 app kept crashing on Render's free tier (512MB RAM) with the same fatal error: <--- Last few GCs ---> [64:0x2b8f5000] 4088091 ms: Scavenge 247.6 (257.2) -> 246.8 (257.2) MB, .