-- MariaDB supports `IF NOT EXISTS` syntax when creating indexes.
-- If an index already exists with the same name, it will not be duplicated.
-- However, you should still review your pre-existing indexes in advance
-- to make sure you do not already have one or more of the same indexes
-- defined under a different name. If so, you should omit them
-- from what you apply to your MariaDB database.

ALTER ONLINE TABLE blc_notification_state ADD INDEX IF NOT EXISTS IDXzsrmtlej61uxhx0yiwpb2rcrv (acked, stopped, notification_name, change_timestamp, next_attempt)