+# Used by FS::Upgrade to migrate to a new database.
+sub _upgrade_data {
+ my ($class, %opts) = @_;
+
+ warn "$me upgrading $class\n" if $DEBUG;
+
+ my $sth = dbh->prepare(
+ 'UPDATE phone_avail SET svcnum = NULL
+ WHERE svcnum IS NOT NULL
+ AND 0 = ( SELECT COUNT(*) FROM svc_phone
+ WHERE phone_avail.svcnum = svc_phone.svcnum )'
+ ) or die dbh->errstr;
+
+ $sth->execute or die $sth->errstr;
+
+}
+