docs:新增公告表sql

bookMarkService/web/src/main/resources/db/migration/V19__新增公告表.sql

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+-- 创建公告表
+create table notify_announce
+(
+    notifyAnnounceId int auto_increment,
+    senderId         int          not null,
+    title            varchar(200) not null,
+    content          text         null,
+    createdDate      bigint(20)   not null,
+    startDate        bigint(20)   not null comment '公告开始时间',
+    endDate          bigint(20)   not null comment '公告结束时间',
+    constraint notify_announce_pk
+        primary key (notifyAnnounceId)
+)
+    comment '公告表';
+
+create index notify_announce_created_date_index
+    on notify_announce (createdDate);
+
+-- 创建公告用户表
+create table user_notify_announce
+(
+    userId           int               not null,
+    notifyAnnounceId int               not null,
+    status           tinyint default 0 null comment '0:未读，1:已读',
+    readDate         bigint(20)        null comment '阅读时间',
+    constraint user_announce_pk
+        primary key (userId, notifyAnnounceId)
+)
+    comment '用户公告表';
+create index user_notify_announce_user_status_index
+    on user_notify_announce (userId, status);
+
+-- 用户表新增上次同步时间
+alter table user
+    add lastSyncAnnounceDate bigint(20) default 0 not null comment '上次同步公告时间';