CREATE TABLE IF NOT EXISTS Drafts (
    CreateAt bigint(20) DEFAULT NULL,
    UpdateAt bigint(20) DEFAULT NULL,
    DeleteAt bigint(20) DEFAULT NULL,
    UserId varchar(26) NOT NULL,
    ChannelId varchar(26) NOT NULL,
    RootId varchar(26) DEFAULT '',
    Message text,
    Props text,
    FileIds text,
    PRIMARY KEY (UserId, ChannelId, RootId)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;