CREATE TABLE subs (
  userid   INT UNSIGNED NOT NULL,
  subid    INT UNSIGNED NOT NULL,
           PRIMARY KEY (userid, subid),
 
  is_dirty   TINYINT UNSIGNED NULL,
             INDEX (is_dirty),
 
  journalid  INT UNSIGNED NOT NULL,
  etypeid    SMALLINT UNSIGNED NOT NULL,
  arg1       INT UNSIGNED NOT NULL,
  arg2       INT UNSIGNED NOT NULL,
 
  ntypeid    SMALLINT UNSIGNED NOT NULL,
 
  createtime INT UNSIGNED NOT NULL,
  expiretime INT UNSIGNED NOT NULL,
  flags      SMALLINT UNSIGNED NOT NULL
)