docs: pg init sql (#1210)

Co-authored-by: tanxiao <tanxiao@asiainfo.com>

docker/initsql_for_postgres/a-n9e-for-Postgres.sql

@@ -198,7 +198,9 @@ CREATE TABLE board (
     id bigserial  not null ,
     group_id bigint not null default 0 ,
     name varchar(191) not null,
+    ident varchar(200) not null default '',
     tags varchar(255) not null ,
+    public smallint not null default 0,
     create_at bigint not null default 0,
     create_by varchar(64) not null default '',
     update_at bigint not null default 0,
@@ -208,6 +210,8 @@ ALTER TABLE board ADD CONSTRAINT board_pk PRIMARY KEY (id);
 ALTER TABLE board ADD CONSTRAINT board_un UNIQUE (group_id,"name");
 COMMENT ON COLUMN board.group_id IS 'busi group id';
 COMMENT ON COLUMN board.tags IS 'split by space';
+COMMENT ON COLUMN board.public IS '0:false 1:true';
+CREATE INDEX board_ident_idx ON board (ident);
 
 -- for dashboard new version
 CREATE TABLE board_payload (