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dS )�JailsaB Handles the jails.
This class handles the jails. Creation, deletion or access to a jail
must be done through this class. This class is thread-safe which is
not the case of the jail itself, including filter and actions. This
class is based on Mapping type, and the `add` method must be used to
add additional jails.
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Adds a new jail if not already present which should use the
given backend.
Parameters
----------
name : str
The name of the jail.
backend : str
The backend to use.
db : Fail2BanDb
Fail2Ban's persistent database instance.
Raises
------
DuplicateJailException
If jail name is already present.
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