Get list of invited users

[jimkleiber]

请注意，这个好像不再起作用了，但是下面的那个对我来说是有效的：

https://meta.discourse.org/t/list-of-users-who-signed-up-via-invitations/224871/6

@JammyDodger

我的 SQL 技能还有点生疏，但可以试试这个，看看我是否正确地进行了查找：

SELECT u1.username AS invitee,
       u2.username AS inviter,
       iu.redeemed_at
FROM invited_users iu
JOIN invites i ON iu.invite_id = i.id
JOIN users u1 ON iu.user_id = u1.id
JOIN users u2 ON i.invited_by_id = u2.id
WHERE iu.redeemed_at IS NOT NULL
ORDER BY iu.redeemed_at DESC