ALTER TABLE Events ADD COLUMN person_name varchar(128) default NULL;
ALTER TABLE Events ADD COLUMN event_when DATETIME default NULL;
-ALTER TABLE Events ADD COLUMN action varchar(64) default '' NOT NULL;
-ALTER TABLE Events ADD COLUMN ipaddr varchar(16) default NULL;
-ALTER TABLE Events ADD COLUMN on_id int(11) default NULL;
-ALTER TABLE Events ADD COLUMN on_table varchar(64) default NULL;
-ALTER TABLE Events ADD COLUMN person_id int(11) default NULL;
-ALTER TABLE Events ADD COLUMN person_table varchar(64) default NULL;
+ALTER TABLE Events ADD COLUMN action varchar(64) NOT NULL default '' ;
+ALTER TABLE Events ADD COLUMN ipaddr varchar(16) NOT NULL default '';
+ALTER TABLE Events ADD COLUMN on_id int(11) NOT NULL default 0;
+ALTER TABLE Events ADD COLUMN on_table varchar(64) NOT NULL default '';
+ALTER TABLE Events ADD COLUMN person_id int(11) NOT NULL default 0;
+ALTER TABLE Events ADD COLUMN person_table varchar(64) NOT NULL default '';
ALTER TABLE Events ADD COLUMN remarks text ;