use bidi;
insert into t values
   (1,   'abc',   1,  '2010-02-01 05:45:30'),
                                               -- error: deleted row
   (3,   'ghi',   5,  '2010-02-01 09:17:52'),
   (4,   'jkl',   6,  '2010-02-01 10:11:33'),  -- same
   (5,   'mno',   3,  '2010-02-01 10:17:40'),
   (6,   'p',     4,  '2010-01-31 10:17:00'),  -- same
   (7,   'qrs',   5,  '2010-02-01 10:11:11'),
   (8,   'TUV',   6,  '2010-01-31 10:17:20'),  -- error: updated val but not ts
   (9,   'wxy',   7,  '2010-02-01 10:17:00'),
   (10,  'rdy',   5,  '2010-02-02 09:09:10'),  -- updated
   (11,  '?',     0,  '2010-01-29 12:19:48'),  -- new/updated
   (12,  '',      0,  '2010-02-01 13:17:19'),  -- newer time, exact date
   (13,  NULL,    0,  '2010-02-01 12:17:31'),
   (14,  NULL,    0,  '2010-02-02 13:00:00'),  -- updated
   (15,  'NA',    0,  '2010-01-31 07:00:01'),
   (16,  NULL,    0,  '2010-02-02 13:20:00');  -- new row