Guo Xiang Tan 44eba0bb60 FIX: Don't rescue PG::UniqueViolation within a transaction.
Also acquire a transaction per link instead of failing when
any of the links can't be processed.

This prevents ActiveRecord from rolling back the transaction
and the next SQL statement sent to PG will fail. This is
however hard to test as it only happens when there are
two competing process trying to process this method at the
same time.
2018-10-18 10:54:30 +08:00
..