For SQLAlchemy to automatically understand updates from the
external world, it must use an `autocommit=True` in its session.
This change breaks how we were using commit previously, as
`autocommit=True` causes SQLAlchemy to commit when a
SessionTransaction context hits __exit__.
So, a refactoring was required of our tests: All usage of
any `db.{create,delete}` must be called **within** a
SessionTransaction context, created via new `db.begin()`.
From this point forward, we're going to require:
```
with db.begin():
db.create(...)
db.delete(...)
db.session.delete(object)
```
With this, we now get external DB modifications automatically
without reloading or restarting the FastAPI server, which we
absolutely need for production.
Signed-off-by: Kevin Morris <kevr@0cost.org>
