DELETE FROM grade_event;
INSERT INTO grade_event VALUES ('2004-09-03','Q',NULL);
INSERT INTO grade_event VALUES ('2004-09-06','Q',NULL);
INSERT INTO grade_event VALUES ('2004-09-09','T',NULL);
INSERT INTO grade_event VALUES ('2004-09-16','Q',NULL);
INSERT INTO grade_event VALUES ('2004-09-23','Q',NULL);
INSERT INTO grade_event VALUES ('2004-10-01','T',NULL);