Method: channels.deleteTopicHistory

Delete message history of a forum topic

Parameters:

Name	Type	Description	Required
channel	Username, chat ID, Update, Message or InputChannel	Forum	Optional
top_msg_id	int	Topic ID	Optional

Return type: messages.AffectedHistory

Can bots use this method: YES

MadelineProto Example (now async for huge speed and parallelism!):

if (!file_exists('madeline.php')) {
    copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();

$messages_AffectedHistory = $MadelineProto->channels->deleteTopicHistory(channel: $InputChannel, top_msg_id: $int, );