-alter table users add column (home_lat double default NULL);
-alter table users add column (home_lon double default NULL);
+alter table users add column (home_lat double default 1);
+alter table users add column (home_lon double default 1);
+alter table users add column home_zoom int(2) default 3);
+alter table users add column within_lon double default null;
+alter table users add column within_lat double default null;