add requestitem table and seq table to schema

dspace/etc/postgres/database_schema.sql

@@ -111,6 +111,7 @@ CREATE SEQUENCE harvested_item_seq;
 CREATE SEQUENCE versionitem_seq;
 CREATE SEQUENCE versionhistory_seq;
 CREATE SEQUENCE webapp_seq;
+CREATE SEQUENCE requestitem_seq;
 
 -------------------------------------------------------
 -- BitstreamFormatRegistry table
@@ -825,3 +826,20 @@ CREATE TABLE Webapp
     Started TIMESTAMP,
     isUI INTEGER
 );
+
+CREATE TABLE requestitem
+(
+  requestitem_id int4 NOT NULL,
+  token varchar(48),
+  item_id int4,
+  bitstream_id int4,
+  allfiles bool,
+  request_email varchar(64),
+  request_name varchar(64),
+  request_date timestamp,
+  accept_request bool,
+  decision_date timestamp,
+  expires timestamp,
+  CONSTRAINT requestitem_pkey PRIMARY KEY (requestitem_id),
+  CONSTRAINT requestitem_token_key UNIQUE (token)
+);