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## Database Checklist
When adding migrations:
- [ ] Updated `db/schema.rb`
- [ ] Added a `down` method so the migration can be reverted
- [ ] Added the output of the migration(s) to the MR body
- [ ] Added tests for the migration in `spec/migrations` if necessary (e.g. when migrating data)
When adding or modifying queries to improve performance:
- [ ] Included data that shows the performance improvement, preferably in the form of a benchmark
- [ ] Included the output of `EXPLAIN (ANALYZE, BUFFERS)` of the relevant queries
When adding foreign keys to existing tables:
- [ ] Included a migration to remove orphaned rows in the source table before adding the foreign key
- [ ] Removed any instances of `dependent: ...` that may no longer be necessary
When adding tables:
-[ ] Ordered columns based on the [Ordering Table Columns](https://docs.gitlab.com/ee/development/ordering_table_columns.html#ordering-table-columns) guidelines
- [ ] Added foreign keys to any columns pointing to data in other tables
- [ ] Added indexes for fields that are used in statements such as WHERE, ORDER BY, GROUP BY, and JOINs
When removing columns, tables, indexes or other structures:
- [ ] Removed these in a post-deployment migration
- [ ] Made sure the application no longer uses (or ignores) these structures
## General Checklist
-[ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added, if necessary
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
## What does this MR do?
(briefly describe what this MR is about)
## Moving docs to a new location?
See the guidelines: http://docs.gitlab.com/ce/development/doc_styleguide.html#changing-document-location
- [ ] Make sure the old link is not removed and has its contents replaced with a link to the new location.
- [ ] Make sure internal links pointing to the document in question are not broken.
- [ ] Search and replace any links referring to old docs in GitLab Rails app, specifically under the `app/views/` directory.
-[ ] Make sure to add [`redirect_from`](https://docs.gitlab.com/ee/development/doc_styleguide.html#redirections-for-pages-with-disqus-comments) to the new document if there are any Disqus comments on the old document thread.
- [ ] If working on CE, submit an MR to EE with the changes as well.
- [ ] Ping one of the technical writers for review.
