In our largest app we have a caching layer and do a lot of transitions 
between SqlAlchemy and a Dict (both directions)

some of these may apply to you:

1. dicts are wrapped in an 'attribute safe' container, so they behave like 
sqlalchemy objects.  certain sqlalchemy relationships are handled via 
lazyloading cache items from a readthrough cache.  

2. there is a per-request local cache of dict objects.

3. the dict containers have a 'readonly' flag, so they raise errors if we 
try to write.  the system loads a fresh sqlalchemy object when it needs to 
write, then updates the cached items.

4. there is a single method for converting the objects from one type to 
another.  after a while, it made more sense to keep the mapping logic 
between the two object types instead of nested into one.

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