Customer Load (0.6ms)  SELECT "customers".* FROM "customers" WHERE "customers"."uid" = '0' LIMIT 1
   (0.6ms)  SAVEPOINT active_record_1

# SELECT locktype, pl.pid, datname, query, query_start, state_change, waiting, state FROM pg_locks pl LEFT JOIN pg_stat_activity psa ON pl.pid = psa.pid;

 relation      |  97 | sandbox_test | SELECT  "customers".* FROM "customers"  WHERE "customers"."uid" = '0' LIMIT 1                                                                          | 2017-11-20 15:46:13.825744+00 | 2017-11-20 15:46:13.825771+00 | f       | idle in transaction
 relation      |  97 | sandbox_test | SELECT  "customers".* FROM "customers"  WHERE "customers"."uid" = '0' LIMIT 1                                                                           | 2017-11-20 15:46:13.825744+00 | 2017-11-20 15:46:13.825771+00 | f       | idle in transaction
 relation      |  97 | sandbox_test | SELECT  "customers".* FROM "customers"  WHERE "customers"."uid" = '0' LIMIT 1                                                                           | 2017-11-20 15:46:13.825744+00 | 2017-11-20 15:46:13.825771+00 | f       | idle in transaction
... another 20 times or so
 relation      |  97 | sandbox_test | SELECT  "customers".* FROM "customers"  WHERE "customers"."uid" = '0' LIMIT 1                                                                           | 2017-11-20 15:46:13.825744+00 | 2017-11-20 15:46:13.825771+00 | f       | idle in transaction

gem 'rails', '3.2.22.5'
gem 'pg', '0.17.1'
gem 'test-unit-rails', '1.0.4'
gem 'mocha', '0.13.3',  :require => false