--- /dev/null
+-- @tag: add_parts_price_history
+-- @description: Tabelle für Entwicklung der Stammdatenpreise
+-- @depends: release_3_4_0
+DROP TRIGGER IF EXISTS add_parts_price_history_entry_after_changes_on_parts ON parts;
+DROP FUNCTION IF EXISTS add_parts_price_history_entry();
+DROP TABLE IF EXISTS parts_price_history;
+
+CREATE TABLE parts_price_history (
+ id SERIAL,
+ part_id INTEGER NOT NULL,
+ valid_from TIMESTAMP NOT NULL,
+ lastcost NUMERIC(15, 5),
+ listprice NUMERIC(15, 5),
+ sellprice NUMERIC(15, 5),
+
+ PRIMARY KEY (id),
+ FOREIGN KEY (part_id) REFERENCES parts (id) ON DELETE CASCADE
+);
+
+INSERT INTO parts_price_history (part_id, valid_from, lastcost, listprice, sellprice)
+SELECT id, COALESCE(COALESCE(mtime, itime), now()), lastcost, listprice, sellprice
+FROM parts;
+
+CREATE FUNCTION add_parts_price_history_entry() RETURNS "trigger" AS $$
+ BEGIN
+ IF (TG_OP = 'UPDATE') AND (OLD.lastcost = NEW.lastcost) AND (OLD.listprice = NEW.listprice) AND (OLD.sellprice = NEW.sellprice) THEN
+ RETURN NEW;
+ END IF;
+
+ INSERT INTO parts_price_history (part_id, lastcost, listprice, sellprice, valid_from)
+ VALUES (NEW.id, NEW.lastcost, NEW.listprice, NEW.sellprice, now());
+
+ RETURN NEW;
+ END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER add_parts_price_history_entry_after_changes_on_parts
+AFTER INSERT OR UPDATE on parts
+FOR EACH ROW EXECUTE PROCEDURE add_parts_price_history_entry();