Initialize migration of sent_notifications.id to bigint
What does this MR do and why?
This is step one of migrating sent_notifications.id to a bigint.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #389344 (closed)
Edited by Jon Jenkins