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if (*{"GreenPartyDB::Database::${table}::${hook}"}{CODE}) {
    my $old = *{"GreenPartyDB::Database::${table}::${hook}"}{CODE};
    my $new = *{__PACKAGE__."::${prefix}${hook}"}{CODE}
...
    *{"GreenPartyDB::Database::${table}::${hook}"} =
        *{__PACKAGE__."::${prefix}${hook}"}{CODE};
}