ALTER TABLE "mailbox"."mail"
    ADD COLUMN "invalidation_contact_flag" varchar(20);

COMMENT ON COLUMN "mailbox"."mail"."invalidation_contact_flag" IS '无效件-是否取得联系';

ALTER TABLE "mailbox"."mail"
    ADD COLUMN "invalidation_attachments" text;

COMMENT ON COLUMN "mailbox"."mail"."invalidation_attachments" IS '无效件-佐证材料';