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Retry adding personal_namespace_id column to events (GitLab.com)

Krasimir Angelov requested to merge 462801-add-events-personal_namespace_id-2 into master

What does this MR do and why?

This is the second attempt the add a new column to events that will be used a part of a composite sharding key.The first attempt was reverted because acquiring a lock on events did not succeed - !164713 (comment 2090794956).

Here we add the column in a post-deployment migration for GitLab.com only, so that we have better control when the migration will be executed. Once we succeed there will be subsequent MR to add the column the regular way for all other instances (!165127 (comment 2092878736)).

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Related to #462801

Edited by Krasimir Angelov

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