feat: add redis cache and fanout support

server/utils.go

@@ -694,6 +694,13 @@ func max(a, b int) int {
 	return b
 }
 
+func max64(a, b int64) int64 {
+	if a > b {
+		return a
+	}
+	return b
+}
+
 // Truncate string if it's too long. Used in logging.
 func truncateStringIfTooLong(s string) string {
 	if len(s) <= 1024 {