add migration file

migrations/20221205-profile-wall.sql

@@ -0,0 +1,5 @@
+alter table comments add column wall_user_id int;
+
+alter table only comments add constraint wall_user_id_fkey foreign key (wall_user_id) references users(id);
+
+create index fki_wall_user_id_fkey on public.comments using btree (wall_user_id);