a given application makes explicit use of `commit` and `rollback` on the 
sqlalchemy session.

a few views require interaction with some other technologies via a 
two-phase commit.  

under the current design, i can't enable two-phase commits for everything. 
 i'm not sure I can detect the need for a two-phase commit early enough to 
use a dedicated session object.  on postgresql (at least), the two-phase 
commit arguments don't appear to be needed until it's ready to commit.

I have a hope this might be possible, but alternatives if not (postgres is 
the only "member" that could veto transactions in this application) 


-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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