text: ALTER TABLE MAIL_HOOK_CONDITIONS DROP COLUMN IF EXISTS POST_LIMIT;
  ALTER TABLE MAIL_HOOK_CONDITIONS ADD COLUMN POST_LIMIT integer;
  comment on column MAIL_HOOK_CONDITIONS.POST_LIMIT is '投稿者の制限';
  
  ALTER TABLE MAIL_HOOK_CONDITIONS DROP COLUMN IF EXISTS LIMIT_PARAM;
  ALTER TABLE MAIL_HOOK_CONDITIONS ADD COLUMN LIMIT_PARAM character varying(256);
  comment on column MAIL_HOOK_CONDITIONS.LIMIT_PARAM is '制限のパラメータ';
  
  
  