text: ALTER TABLE request_audit_record
    DROP CONSTRAINT request_audit_method_auth_method_constraint;
  
  ALTER TABLE request_audit_record
    ADD CONSTRAINT request_audit_method_auth_method_constraint
    CHECK (auth_method IN ('uaa', 'mutual_tls', 'unknown'));
  
  ALTER TABLE `request_audit_record`
    ALTER COLUMN `auth_method`
    VARCHAR(10) DEFAULT 'unknown' NOT NULL;
  