As Autocommit is off you are required to finish every transaction with a commit or rollback. Unfinished transactions e.g. upon disconnect will not be committed. 
    $dbh->do ("DELETE FROM managers WHERE id = '$self->{myId}'");
    $dbh->commit();     # <===== add this line
    $dbh->disconnect ();

[download]
So just add the commit to your destroy code.

Update: looks like you found out in parallel :-)

In reply to Re: SQLite select not returning all rows by varian
in thread SQLite select not returning all rows by GrandFather

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