This command can be found here in our GitHub repository. The prefix command, or "setprefix" is a default command that allows members with the necessary permissions to change the servers prefix that the bot will respond to. The prefix is initially stored in cache, which is used to update the database every so often. Once the prefix is updated, the bot will stop responding to the old prefix and will only respond to the new prefix. This new prefix will be passed through each command in the run parameters just like before.
Usage: ?setprefix <new_prefix>