Karma observer test leaves junk in the DB

[Jereme Corrado]

yetibot=# select * from yetibot_karma where user_id like '%test%';
          user_id          | points |         voter_id         | note |  id  |         created_at
---------------------------+--------+--------------------------+------+------+----------------------------
 @test-user-1555344689231  |      1 | test-voter-1555344689231 |      | 1786 | 2019-04-15 12:11:29.736259
 @test-user-1555344689231  |     -1 | test-voter-1555344689231 |      | 1787 | 2019-04-15 12:11:29.792055
 @test-voter-1555344689231 |     -1 | test-voter-1555344689231 |      | 1788 | 2019-04-15 12:11:29.83862
 @test-user-1555344689231  |      1 | test-voter-1555344689231 |      | 1789 | 2019-04-15 12:11:29.888732
 @test-user-1555344689231  |     -1 | test-voter-1555344689231 |      | 1790 | 2019-04-15 12:11:29.926939
 @test-voter-1555344689231 |     -1 | test-voter-1555344689231 |      | 1791 | 2019-04-15 12:11:29.959549
(6 rows)