Added default date config in calendar data

supabase/migrations/202401_init.sql

@@ -48,6 +48,7 @@ comment on table public.worlds is 'Worlds belonging to a single user ; a game ma
 create table public.calendars (
   id                bigint generated by default as identity primary key,
   name              text not null,
+  today             json not null,
   world_id          bigint references public.worlds on delete cascade not null
 );
 comment on table public.calendars is 'Calendar settings and configuration attached to a single world.';