- Better logic to recursively link parent/children entities, so partial
updates won't get lost.
- Removed `EntitiesCache` - it was too much to maintain while keeping
consistent with the ORM, and it was a perennial fight against
SQLAlchemy's own cache.
- Removed `EntityNotifier` - with no need to merge cached entities, the
`notify` method has become much simpler and it's simply been merged
in the `EntitiesRepository`.
This may make things a bit less optimal, but it's probably the only
possible solution that preserves my sanity.
Managing upserts of cached instances that were previously made transient
and expunged from the session is far from easy, and the management of
recursive parent/children relationships only add one more layer of
complexity (and that management is already complex enough in its current
implementation).
Fabio Manganiello