From 384f6d9a317ccd91980850c5a25fd0d9947a6691 Mon Sep 17 00:00:00 2001
From: 23rd <23rd@vivaldi.net>
Date: Fri, 10 Oct 2025 19:01:17 +0300
Subject: [PATCH] Added logging of api updates when deleted message is unknown.

---
 Telegram/SourceFiles/api/api_updates.cpp | 11 +++++++++++
 Telegram/SourceFiles/history/history.cpp |  8 ++++++++
 Telegram/SourceFiles/history/history.h   |  3 +++
 3 files changed, 22 insertions(+)

diff --git a/Telegram/SourceFiles/api/api_updates.cpp b/Telegram/SourceFiles/api/api_updates.cpp
index ddfabb6a56..4326245720 100644
--- a/Telegram/SourceFiles/api/api_updates.cpp
+++ b/Telegram/SourceFiles/api/api_updates.cpp
@@ -1627,6 +1627,17 @@ void Updates::feedUpdate(const MTPUpdate &update) {
 		auto &d = update.c_updateNewChannelMessage();
 		auto channel = session().data().channelLoaded(peerToChannel(PeerFromMessage(d.vmessage())));
 		const auto isDataLoaded = AllDataLoadedForMessage(&session(), d.vmessage());
+		{
+			// Todo delete.
+			const auto messageId = IdFromMessage(d.vmessage());
+			if (const auto history = channel ? session().data().historyLoaded(channel) : nullptr) {
+				if (history->isUnknownMessageDeleted(messageId)) {
+					LOG(("Unknown message deleted detected for channel %1, message %2")
+						.arg(channel->id.value & PeerId::kChatTypeMask)
+						.arg(messageId.bare));
+				}
+			}
+		}
 		if (!requestingDifference() && (!channel || isDataLoaded != DataIsLoadedResult::Ok)) {
 			MTP_LOG(0, ("getDifference "
 				"{ good - after not all data loaded in updateNewChannelMessage }%1"
diff --git a/Telegram/SourceFiles/history/history.cpp b/Telegram/SourceFiles/history/history.cpp
index 62ffcdd035..d8c12b0731 100644
--- a/Telegram/SourceFiles/history/history.cpp
+++ b/Telegram/SourceFiles/history/history.cpp
@@ -2976,11 +2976,19 @@ bool History::shouldBeInChatList() const {
 }
 
 void History::unknownMessageDeleted(MsgId messageId) {
+	LOG(("History::unknownMessageDeleted. Peer ID: %1, Message ID: %2.")
+		.arg(peer->id.value & PeerId::kChatTypeMask)
+		.arg(messageId.bare));
+	_unknownDeletedMessages[messageId] = base::unixtime::now();
 	if (_inboxReadBefore && messageId >= *_inboxReadBefore) {
 		owner().histories().requestDialogEntry(this);
 	}
 }
 
+bool History::isUnknownMessageDeleted(MsgId messageId) const {
+	return _unknownDeletedMessages.contains(messageId);
+}
+
 bool History::isServerSideUnread(not_null<const HistoryItem*> item) const {
 	Expects(item->isRegular());
 
diff --git a/Telegram/SourceFiles/history/history.h b/Telegram/SourceFiles/history/history.h
index e44f994523..63dac2ed2a 100644
--- a/Telegram/SourceFiles/history/history.h
+++ b/Telegram/SourceFiles/history/history.h
@@ -249,6 +249,7 @@ public:
 	[[nodiscard]] bool lastMessageKnown() const;
 	[[nodiscard]] bool lastServerMessageKnown() const;
 	void unknownMessageDeleted(MsgId messageId);
+	[[nodiscard]] bool isUnknownMessageDeleted(MsgId messageId) const;
 	void applyDialogTopMessage(MsgId topMessageId);
 	void applyDialog(Data::Folder *requestFolder, const MTPDdialog &data);
 	void applyPinnedUpdate(const MTPDupdateDialogPinned &data);
@@ -668,6 +669,8 @@ private:
 	base::flat_map<Data::DraftKey, int> _savingCloudDraftRequests;
 	base::flat_map<Data::DraftKey, Data::ForwardDraft> _forwardDrafts;
 
+	base::flat_map<MsgId, TimeId> _unknownDeletedMessages;
+
 	QString _topPromotedMessage;
 	QString _topPromotedType;