AO3-5194 Update schema and structure files

[redsummernight]

Issue

https://otwarchive.atlassian.net/browse/AO3-5194

Purpose

Generate new versions of schema dumps from production:

bundle exec rake db:schema:dump    # Ruby dump
bundle exec rake db:structure:dump # SQL dump

Manually edit the resulting files:

• Ruby dump: Change the version in ActiveRecord::Schema.define to the latest migration timestamp. Then we need to check the existing pull requests for migrations and bump their timestamps to later.
• SQL dump: Remove AUTO_INCREMENT values.

Replaces #3643.

Testing Instructions

Travis build should pass.

[sarken]

It's so neat and tidy 😍 Especially the way the indexes are now in the create_table bit rather than after it. And thank you for the instructions for next time so it doesn't take so many attempts!