lemmy/migrations/2021-11-22-135324_add_activ.../up.sql

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-- Delete the empty ap_ids
delete from activity where ap_id is null;
-- Make it required
alter table activity alter column ap_id set not null;
-- Delete dupes, keeping the first one
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delete from activity a using (
select min(id) as id, ap_id
from activity
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group by ap_id having count(*) > 1
) b
where a.ap_id = b.ap_id
and a.id <> b.id;
-- The index
create unique index idx_activity_ap_id on activity(ap_id);
-- Drop the old index
drop index idx_activity_unique_apid;