ALTER TABLE audit_event
    ADD COLUMN operation_id text,
    ADD COLUMN action text,
    ADD COLUMN outcome text CHECK (outcome IN ('succeeded', 'failed', 'unknown')),
    ADD COLUMN old_image_version text,
    ADD COLUMN new_image_version text;

ALTER TABLE network_exit
    ADD COLUMN last_check_reason text;

CREATE INDEX audit_event_operation_id_idx
    ON audit_event (operation_id) WHERE operation_id IS NOT NULL;