$dbh->do ("INSERT INTO $table (start, end) VALUES (?,?);", @{$cluster})

When you use do with placeholders and bind values, you also need to specify the \%attr hashref (for syntactical reasons, because the synopsis is $dbh->do($statement, \%attr, @bind_values)).  You may use undef if you don't have any attributes.

$dbh->do ("INSERT INTO $table (start, end) VALUES (?,?)", undef, @$clu
+ster)
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