I'm trying to use UNIQUE on a column in a table, catching exception in 
order to determine conflict.

Problem is that the exception I'm getting is sqlite3.IntegrityError. This 
is not a SqlAlchemy exception, and its a problem since sqlite is temporary.
I expected to get a ORM/SA exception, that will be the same with different 
engines.

(also sqlite goes bonkers after it happens, requiring transaction rollback)

I know I can query first, but that makes using the UNIQUE designation kind 
of moot.

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