Drop unique index on sent_notifications reply_key
What does this MR do and why?
The index was already dropped in .com over the weekend with !214455 (merged).
This was a huge index that we are dropping now
as an initial step towards dropping the entire table
in favor of the new partitioned table
p_sent_notifications
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.
Related to #562080