ALTER TABLE `xf_conversation_message`
ADD COLUMN `likes` INT UNSIGNED NOT NULL DEFAULT 0,
ADD COLUMN `like_users` BLOB,
ADD COLUMN `edit_count` int not null default 0,
ADD COLUMN `last_edit_date` int not null default 0,
ADD COLUMN `last_edit_user_id` int not null default 0;
ALTER TABLE `xf_conversation_master`
ADD COLUMN `conversation_edit_count` int not null default 0,
ADD COLUMN `conversation_last_edit_date` int not null default 0,
ADD COLUMN `conversation_last_edit_user_id` int not null default 0;