lemmy/server/migrations/2020-02-02-004806_add_case_insensitive_usernames/up.sql

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SQL
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-- Add case insensitive username and email uniqueness
-- An example of showing the dupes:
-- select
-- max(id) as id,
-- lower(name) as lname,
-- count(*)
-- from user_
-- group by lower(name)
-- having count(*) > 1;
-- Delete username dupes, keeping the first one
delete
from user_
where id not in (
select min(id)
from user_
group by lower(name), lower(fedi_name)
);
-- The user index
create unique index idx_user_name_lower on user_ (lower(name));
-- Email lower
create unique index idx_user_email_lower on user_ (lower(email));
-- Set empty emails properly to null
update user_ set email = null where email = '';