use `lx-im`;
create table `user`(
    `id` bigint not null auto_increment primary key  comment 'id',
    `user_name` varchar(255) not null comment '用户名',
    `nick_name` varchar(255) not null comment '用户昵称',
    `head_image` varchar(255) default '' comment '用户头像',
    `head_image_thumb` varchar(255) default '' comment '用户头像缩略图',
    `password` varchar(255) not null comment '密码(明文)',
    `sex`  tinyint(1) default 0 comment '性别 0:男 1::女',
    `signature` varchar(1024) not null comment '个性签名',
    `last_login_time`  datetime DEFAULT null comment '最后登录时间',
    `created_time` datetime DEFAULT CURRENT_TIMESTAMP comment '创建时间',
    unique key `idx_user_name`(user_name),
    key `idx_nick_name`(nick_name)
);

create table `friends`(
    `id` bigint not null auto_increment primary key  comment 'id',
    `user_id` bigint not null  comment '用户id',
    `friend_id` bigint not null  comment '好友id',
    `friend_nick_name` varchar(255) not null comment '用户昵称',
    `friend_head_image` varchar(255) default '' comment '用户头像',
    `created_time` datetime DEFAULT CURRENT_TIMESTAMP comment '创建时间',
    key `idx_user_id` (`user_id`),
    key `idx_friend_id` (`friend_id`)
);


create table `single_message`(
    `id` bigint not null auto_increment primary key comment 'id',
    `send_user_id` bigint not null  comment '发送用户id',
    `recv_user_id` bigint not null  comment '接收用户id',
    `content` text   comment '发送内容',
    `type`  tinyint(1) NOT NULL  comment '消息类型 0:文字 1:图片 2:文件',
    `status` tinyint(1) NOT NULL   comment '状态 0:未读 1:已读 ',
    `send_time` datetime DEFAULT CURRENT_TIMESTAMP comment '发送时间',
    key `idx_send_recv_user_id` (`send_user_id`,`recv_user_id`)
);