CREATE TABLE "a_tbl_tree" (
        "id" integer NOT NULL,
        "_parent" integer,
        "_note" character varying(128),
        "_picture" character varying(255),
        Constraint "a_tbl_tree_pkey" Primary Key ("id")
);

CREATE TABLE "a_tbl_log" (
        "_time" timestamp with time zone DEFAULT "timestamp"('now'::text),
        "_picture" character varying(255)
);

INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (0,0,'root','');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (1,0,'Master node 1','mn1.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (2,0,'Master node 2','mn2.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (3,0,'Master node 3','mn3.gif');

INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (10,1,'Sub-node 1-1','sn11.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (11,1,'Sub-node 1-2','sn12.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (12,1,'Sub-node 1-3','sn13.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (13,1,'Sub-node 1-4','sn14.gif');

INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (20,2,'Sub-node 2-1','sn21.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (21,2,'Sub-node 2-2','sn22.gif');
INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (22,2,'Sub-node 2-3','sn23.gif');

INSERT INTO "a_tbl_tree" ("id","_parent","_note","_picture") VALUES (33,3,'Sub-node 3-1','sn31.gif');

CREATE RULE rule_tbl_tree_del AS ON DELETE TO a_tbl_tree DO INSERT INTO a_tbl_log ("_picture") VALUES(OLD._picture);