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Drop `echo_notification_user_hash_timestamp` index where it exists
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Should've been part of T143763: Remove unused bundling DB fields, but wasn't included in the request. The index was left in the canonical SQL file for Echo too, until


DROP INDEX /*i*/echo_notification_user_hash_timestamp ON /*_*/echo_notification;

Where: Everywhere that has the echo_notification table

When: At DBA's leisure (patch is merged, no code dependancy)

Is backwards compatible: Yes

Has been tested already: Index will have been dropped on wikis running master for a long time

Schema change progress:

Progress on x1