Sam Saffron 7f841dc21f
PERF: avoid race conditions when creating topic links
Previously the code was very race condition prone leading to
odd failures in production

It was re-written in raw SQL to avoid conditions where rows
conflict on inserts

There is no clean way in ActiveRecord to do:

Insert, on conflict do nothing and return existing id.

This also increases test coverage, we were previously not testing
the code responsible for crawling external sites directly
2020-05-13 16:05:57 +10:00
..
2020-05-05 13:46:57 +10:00
2020-05-12 16:55:42 +10:00