Adding username and email case insensitivity uniqueness. Fixes #341

server/migrations/2020-02-02-004806_add_case_insensitive_usernames/down.sql

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+drop index idx_user_name_lower;
+drop index idx_user_email_lower;

server/migrations/2020-02-02-004806_add_case_insensitive_usernames/up.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 = '';
+