Identifier of the chat to which the topic belongs.
A draft of a message in the topic; may be null if none.
Unique topic identifier.
Optional is_True, if the forum topic is marked as unread.
Last message in the topic; may be null if none or unknown.
Identifier of the last read incoming message.
Identifier of the last read outgoing message.
A parameter used to determine order of the topic in the topic list. Topics must be sorted by the order in descending order.
Identifier of the user or chat that sends the messages to the topic.
Number of unread messages in the chat.
Number of messages with unread reactions in the chat.
Contains information about a topic in a channel direct messages chat administered by the current user.