The message field is not used (#16910)

Author: Alek5andr-Kotov

ydb/core/persqueue/events/internal.h

@@ -492,15 +492,13 @@ struct TEvPQ {
     };
 
     struct TEvBlobRequest : public TEventLocal<TEvBlobRequest, EvBlobRequest> {
-        TEvBlobRequest(const TString& user, const ui64 cookie, const NPQ::TPartitionId& partition,
+        TEvBlobRequest(const ui64 cookie, const NPQ::TPartitionId& partition,
                        TVector<NPQ::TRequestedBlob>&& blobs)
-        : User(user)
-        , Cookie(cookie)
+        : Cookie(cookie)
         , Partition(partition)
         , Blobs(std::move(blobs))
         {}
 
-        TString User;
         ui64 Cookie;
         NPQ::TPartitionId Partition;
         TVector<NPQ::TRequestedBlob> Blobs;

ydb/core/persqueue/partition_read.cpp

@@ -1065,13 +1065,12 @@ void TPartition::ProcessRead(const TActorContext& ctx, TReadInfo&& info, const u
         return;
     }
 
-    const TString user = info.User;
     bool res = ReadInfo.emplace(cookie, std::move(info)).second;
     PQ_LOG_D("Reading cookie " << cookie << ". Send blob request.");
     Y_ABORT_UNLESS(res);
 
-    THolder<TEvPQ::TEvBlobRequest> request(new TEvPQ::TEvBlobRequest(user, cookie, Partition,
-                                                                     std::move(blobs)));
+    auto request = MakeHolder<TEvPQ::TEvBlobRequest>(cookie, Partition,
+                                                     std::move(blobs));
 
     ctx.Send(BlobCache, request.Release());
 }