Tweak tests and template data - testing philosophy

Right now, the tests actually modify the database. I think this is undesirable behavior. Tests should either undo modifications they make to the database or NOT make them. The tests should use database content and I don't think need to test database modification. (Astrodb_utils does the database modification tests.)

The issue names the tests and Astrodb_utils but no specific files; start by locating tests that modify the database and compare them with Astrodb_utils. Done means tests use existing database content or undo their changes, without testing database modification where Astrodb_utils already covers it.

Written by the indexing model from the issue text.