Comment 7 for bug 1937294

I want to reiterate that a big part of the problem is that our tests depend on the behavior of the scripts used to load the sample data. The behavior of these scripts changes with Pg11 and later PostgreSQL versions. This is what the folks in the PostgreSQL IRC channel said is us relying on undefined behavior.

I specifically encountered an example of this when looking into the failure of the hold targeter test mentioned in comment #3.