Inherits PgServerMessage
The frontend sends us this when someone has run notify, see http://www.postgresql.org/docs/8.1/static/sql-notify.html and http://www.postgresql.org/docs/8.1/static/protocol-message-formats.html
We invoke DatabaseSignal.
Returns the NOTIFY argument without any quoting.
Returns the notification pid as specified by the server.
Returns the notification source, usually an empty string.
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