If I understand correctly, because groupcache doesn't allow modify value (except it deleted by LRU???), I need to add time bucket to the key?
```
func timeBucket(t time.Time) string {
return t.Format("2006_01_02_15_04")
}
func userCacheKey(id string, t time.Time) string {
return id + timeBucket(t)
}
```
Do I understand thing correctly?