Backfill namespace_traversal_ids on issues table

Nicolas Dularrequested to merge
nd/backfill-traversal-ids into master

What does this MR do and why?

Backfill namespace_traversal_ids on issues table

Adds the batched background migration for namespace_traversal_ids on the issues table.

Changelog: added

References

Screenshots or screen recordings

Before After

How to set up and validate locally

Before the migration

WorkItem.all.map(&:namespace_traversal_ids) # should be `[]` if you didn't transfer the project recently

After the migration

WorkItem.all.map(&:namespace_traversal_ids) # should be `[..namespace ids..]`

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Nicolas Dular

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