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Michael Becker authored
`due_date_sourcing_milestone_id` is always `nil` in production: ```sh [ gstg ] production> Vulnerability.where.not(due_date_sourcing_milestone_id: nil).count => 0 [ gstg ] production> ``` It was added [when the initial vulnerability table][1] was created, however appears to have never been used. This MR ignores the column for step 1 of the [3-MR drop column process][0] related to: #268154 Changelog: deprecated [0]:https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#dropping-columns [1]:8ad1881c