Each member must have their own email. members has 50 000 rows, and nothing stops two of them from sharing an email yet.

1. List the indexes of members. What is the name of the index behind the primary key?
2. Try to create a unique index named members_email_key on email. Which email does the error say is duplicated?
3. Two members share that email. Delete the one with the higher id.
4. Create the unique index members_email_key on email.
5. Try to add member 50001, monster50001, with the email user77@example.com, country CA, joined 2025-07-01. Complete the error: duplicate key value violates ___ "members_email_key".