project=# select * from tasks_test;
   id   |         task_spec         |   status   | worker  |          updated           |   data
--------+---------------------------+------------+---------+----------------------------+----------
 task10 | {"p": 179424691, "a": 10} | UNASSIGNED |         | 2018-05-20 17:51:48.54769  |
 task11 | {"p": 179424691, "a": 11} | UNASSIGNED |         | 2018-05-20 17:51:48.54769  |
 task12 | {"p": 179424691, "a": 12} | UNASSIGNED |         | 2018-05-20 17:51:48.54769  |
 task13 | {"p": 179424691, "a": 13} | UNASSIGNED |         | 2018-05-20 17:51:48.54769  |
 task1  | {"p": 179424691, "a": 1}  | SUCCESS    | worker0 | 2018-05-21 00:51:48.589696 | 1
 task2  | {"p": 179424691, "a": 2}  | WORKING    | worker2 | 2018-05-20 17:51:48.54769  |
 task3  | {"p": 179424691, "a": 3}  | SUCCESS    | worker1 | 2018-05-21 00:52:03.925671 | 59808230
 task5  | {"p": 179424691, "a": 5}  | SUCCESS    | worker1 | 2018-05-21 00:52:08.813992 | 17942469
 task4  | {"p": 179424691, "a": 4}  | SUCCESS    | worker0 | 2018-05-21 00:52:11.834029 | 89712345
 task6  | {"p": 179424691, "a": 6}  | SUCCESS    | worker1 | 2018-05-21 00:52:13.056007 | 17942469
 task8  | {"p": 179424691, "a": 8}  | WORKING    | worker1 | 2018-05-20 17:51:48.54769  |
 task7  | {"p": 179424691, "a": 7}  | SUCCESS    | worker0 | 2018-05-21 00:52:19.558986 | 29904115
 task9  | {"p": 179424691, "a": 9}  | WORKING    | worker0 | 2018-05-20 17:51:48.54769  |
(13 rows)