Thanks Mike! I followed up on your suggestion concerning savepoints and 
came up with the following code snippet. Does this look right to you?

```
try:
    with orm_session.begin_nested():
        orm_session.add(record)
except psycopg2.errors.UniqueViolation as error: # or is it 
`sqlalchemy.exc.IntegrityError`???
    # Matching metadata row already inserted by someone else
    # Fetch and return existing record

# We inserted it!
return record
```

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

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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