fix(MainDb): add missing transactions on little req, add safety

src/db/main-db.cpp

@@ -2012,6 +2012,7 @@ int MainDb::getChatMessageCount (const ChatRoomId &chatRoomId) const {
 				"  SELECT event_id FROM conference_event WHERE chat_room_id = :chatRoomId"
 				")";
 
+			soci::transaction tr(*session);
 			const long long &dbChatRoomId = d->selectChatRoomId(chatRoomId);
 			*session << query, soci::use(dbChatRoomId), soci::into(count);
 		}
@@ -2045,6 +2046,7 @@ int MainDb::getUnreadChatMessageCount (const ChatRoomId &chatRoomId) const {
 		if (!chatRoomId.isValid())
 			*session << query, soci::into(count);
 		else {
+			soci::transaction tr(*session);
 			const long long &dbChatRoomId = d->selectChatRoomId(chatRoomId);
 			*session << query, soci::use(dbChatRoomId), soci::into(count);
 		}
@@ -2079,6 +2081,7 @@ void MainDb::markChatMessagesAsRead (const ChatRoomId &chatRoomId) const {
 		if (!chatRoomId.isValid())
 			*session << query;
 		else {
+			soci::transaction tr(*session);
 			const long long &dbChatRoomId = d->selectChatRoomId(chatRoomId);
 			*session << query, soci::use(dbChatRoomId);
 		}
@@ -2280,10 +2283,11 @@ int MainDb::getHistorySize (const ChatRoomId &chatRoomId, FilterMask mask) const
 	return L_SAFE_TRANSACTION {
 		L_D();
 
+		soci::session *session = d->dbSession.getBackendSession();
+		soci::transaction tr(*session);
+
 		int count;
 		const long long &dbChatRoomId = d->selectChatRoomId(chatRoomId);
-
-		soci::session *session = d->dbSession.getBackendSession();
 		*session << query, soci::into(count), soci::use(dbChatRoomId);
 
 		return count;