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# frozen_string_literal: true
class AdjustUniqueIndexAlertManagementAlerts < ActiveRecord::Migration[6.0]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
INDEX_NAME = 'index_alert_management_alerts_on_project_id_and_fingerprint'
NEW_INDEX_NAME = 'index_partial_am_alerts_on_project_id_and_fingerprint'
RESOLVED_STATUS = 2
disable_ddl_transaction!
def up
add_concurrent_index(:alert_management_alerts, %w(project_id fingerprint), where: "status <> #{RESOLVED_STATUS}", name: NEW_INDEX_NAME, unique: true, using: :btree)
remove_concurrent_index_by_name :alert_management_alerts, INDEX_NAME
end
def down
# Nullify duplicate fingerprints, except for the newest of each match (project_id, fingerprint).
query = <<-SQL
UPDATE alert_management_alerts am
SET fingerprint = NULL
WHERE am.created_at <>
(SELECT MAX(created_at)
FROM alert_management_alerts am2
WHERE am.fingerprint = am2.fingerprint AND am.project_id = am2.project_id)
AND am.fingerprint IS NOT NULL;
SQL
execute(query)
remove_concurrent_index_by_name :alert_management_alerts, NEW_INDEX_NAME
add_concurrent_index(:alert_management_alerts, %w(project_id fingerprint), name: INDEX_NAME, unique: true, using: :btree)
end
end
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