cache

I often need a fast read path for small datasets (like a list of active plans or an allowlist) that updates periodically. Instead of locking on every read, I store a pointer to an immutable snapshot in atomic.Pointer. Reads are lock-free and safe; ref

When a cache key expires, it’s easy for a burst of requests to stampede the database. I use singleflight.Group to ensure only one goroutine performs the expensive fill per key while others wait for the shared result. This doesn’t replace proper TTLs o