lemmy/migrations/2021-03-20-185321_move_matrix_id_to_person/down.sql

alter table local_user add column matrix_user_id text;

update local_user lu
set matrix_user_id = p.matrix_user_id 
from person p
where p.id = lu.person_id;

drop view person_alias_1, person_alias_2;
alter table person drop column matrix_user_id;

-- Regenerate the person_alias views
create view person_alias_1 as select * from person;
create view person_alias_2 as select * from person;