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� | _ d S( s Creates a database namespace manager
``url``
SQLAlchemy compliant db url
``sa_opts``
A dictionary of SQLAlchemy keyword options to initialize the engine
with.
``optimistic``
Use optimistic session locking, note that this will result in an
additional select when updating a cache value to compare version
numbers.
``table_name``
The table name to use in the database for the cache.
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