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$dbh->begin_work;
my $channel = $dbh->selectrow_hashref("SELECT * FROM data WHERE ToScan
+ IS NULL AND title IS NOT NULL limit 1 FOR UPDATE SKIP LOCKED");
...
  $dbh->do("UPDATE data SET lock=1 WHERE id=?", undef, $ID) // die $rs
+th->errstr;
}
$dbh->commit;