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my %TABLES = (      # Hash identifying one database
  'users' => [      # Hash keys are the database's tables
...
    'rating'
  ]
);

$handle->insert (
  -table        =>  "users",
...
    rating        =>  10
  }
);

sub insert {
  my ($self, %q) = @_;
...

  # This is the line that causes problems. Read below for more.
  $sth->execute(values %{$q{'-values'}});