can add a show repeating or non repeating. need a better dialog though with more validation. Also added additional sql files to build directory.

build/sql/triggers.sql

@@ -0,0 +1,23 @@
+----------------------------------------------------------------------------------
+--calculate_position()
+----------------------------------------------------------------------------------
+DROP FUNCTION calculate_position() CASCADE;
+
+CREATE FUNCTION calculate_position() RETURNS trigger AS
+    '
+    BEGIN
+    	IF(TG_OP=''INSERT'') THEN
+        	UPDATE cc_playlistcontents SET position = (position + 1) 
+		WHERE (playlist_id = new.playlist_id AND position >= new.position AND id != new.id);
+        END IF;
+        IF(TG_OP=''DELETE'') THEN
+        	UPDATE cc_playlistcontents SET position = (position - 1) 
+		WHERE (playlist_id = old.playlist_id AND position > old.position);
+        END IF;
+        RETURN NULL;
+    END;
+    '
+	LANGUAGE 'plpgsql';
+
+CREATE TRIGGER calculate_position AFTER INSERT OR DELETE ON cc_playlistcontents
+FOR EACH ROW EXECUTE PROCEDURE calculate_position();