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mastodon/db/migrate/20171125190735_remove_old_r...

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class RemoveOldReblogIndexOnStatuses < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
# This index may not exists (see migration 20171122120436)
remove_index :statuses, [:account_id, :reblog_of_id] if index_exists?(:statuses, [:account_id, :reblog_of_id])
remove_index :statuses, :reblog_of_id
end
def down
add_index :statuses, :reblog_of_id, algorithm: :concurrently
end
end