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# Pass these items
# DBI object
...
# r2h's in other modules return an array instead
# ($data, $err) so that caller can distinguish between no
# entry in the table and a real error.

sub create_lead {
  my $self = shift;
...

  return $data;
}

sub save_lead {
  my $self = shift;
...

  return 1;
}

r2h(..) {
  my $dbh = shift;
...
  }
  ...
}

create_tmp_table('leads');
.. creates leads_XXXXX in MySQL DB
.. methods like save_lead() will create the row or update the row in t
+hat table instead.