We have 3913 accounts where `lu_global_id is null`, and only 5 usernames have more than one row.
We should create globaluser rows for these accounts where there's only one row.
`migrateAccount.php` can mostly do this, and `attachbroken` would get round the empty email etc...
```lang=sql
wikiadmin2023@10.192.48.205(centralauth)> select lu_name, count(*) as cnt, group_concat(lu_wiki) from localuser where lu_global_id is null group by lu_name having cnt > 1;
+------------------------------+-----+-----------------------+
| lu_name | cnt | group_concat(lu_wiki) |
+------------------------------+-----+-----------------------+
| Besir.arifi | 2 | mkwiki,sqwiki |
| Fabriciotg | 2 | cawiki,eswiki |
| Mazzikamadura | 2 | enwiki,idwiki |
| SELFEDITION | 2 | enwiki,svwiki |
| Trần Nguyễn Hạo Thiên | 2 | enwiki,viwiki |
+------------------------------+-----+-----------------------+
```
What's the best way to create CentralAuth accounts, and therefore globaluser rows for these users?
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See also: {T388983}, {T303590}