Most of the important database access is through the $form object.
$form->{dbh} is a non-autocommit database handle.
$form->dbinit initiates the $form->{dbh} and caches the custom fields table.
$form->callproc($procname, @arguments) returns @hashref_records
This is a wrapper for the stored procedures. Prepares a parameterized query,
fills in the arguments, and returns the results as a list of hashrefs.
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