[Bug] Unit tests inconsistently fail due to database after v1.7.0

[manning-ncsa]

After migrating from MariaDB to PostgreSQL in v1.7.0, the unit tests inconsistently fail with the following error about the temporary test database being in use when the Django test system is attempting to drop the database:

django.db.utils.OperationalError: database "test_blast_db" is being accessed by other users
DETAIL:  There is 1 other session using the database.

This is seen (sometimes) when running the unit test using the Compose config:

$ bash run/blastctl full_dev up