To reproduce the error is needed:
Python 3.2.0
SqlAlchemy 0.7.1
I use PostgreSQL 8.4 + psycopg2 2.4.2 but I think it does not matter.

Contents of the table in the database before running the script. This
is important.

test2=# SELECT * from fl_opts ;
 key | value
-----+-------
 b   | 3
(1 row)

If the table is empty, everything works fine.
However, if in the course of one transaction are trying to make
modifications and add a record appears in an error described earlier.

Test script: http://pastebin.com/vNPGm0j1

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