fix SETEX replication does not work

Author: YuCai18

src/pika_kv.cc

@@ -1771,7 +1771,9 @@ void PKSetexAtCmd::DoInitial() {
 }
 
 void PKSetexAtCmd::Do() {
-  s_ = db_->storage()->PKSetexAt(key_, value_, static_cast<int32_t>(time_stamp_sec_ * 1000));
+  // Use int64_t to avoid overflow
+  int64_t time_stamp_ms = static_cast<int64_t>(time_stamp_sec_) * 1000;
+  s_ = db_->storage()->PKSetexAt(key_, value_, time_stamp_ms);
   if (s_.ok()) {
     res_.SetRes(CmdRes::kOk);
   } else if (s_.IsInvalidArgument()) {