There are a half-dozen other tests that can't run with CheckReplDBHashInBackground, and these tests must all be excluded from 29 YAML tests that execute CheckReplDBHashInBackground. Any time we make a new test that's incompatible with CheckReplDBHashInBackground we must add it to all the YAML files, and if we make a new suite that invokes CheckReplDBHashInBackground, we make a new copy of the list. This is a lot of copying, and a very high chance of provoking build failures.

Let's introduce a tag for tests that are incompatible with CheckReplDBHashInBackground. Let's consider tags for other test fixtures as well.