+# _upgrade_data
+#
+# Used by FS::Upgrade to migrate to a new database.
+
+use FS::UID qw( driver_name dbh );
+
+sub _upgrade_data { # class method
+ my ($class, %opts) = @_;
+
+ warn "[FS::h_cust_svc] upgrading $class\n" if $DEBUG;
+
+ return if driver_name =~ /^mysql/; #You can't specify target table 'h_cust_svc' for update in FROM clause
+
+ my $sql = "
+ DELETE FROM h_cust_svc
+ WHERE history_action = 'delete'
+ AND historynum != ( SELECT min(historynum) FROM h_cust_svc AS main
+ WHERE main.history_date = h_cust_svc.history_date
+ AND main.history_user = h_cust_svc.history_user
+ AND main.svcnum = h_cust_svc.svcnum
+ AND main.svcpart = h_cust_svc.svcpart
+ AND ( main.pkgnum = h_cust_svc.pkgnum
+ OR ( main.pkgnum IS NULL AND h_cust_svc.pkgnum IS NULL )
+ )
+ AND ( main.overlimit = h_cust_svc.overlimit
+ OR ( main.overlimit IS NULL AND h_cust_svc.overlimit IS NULL )
+ )
+ )
+ ";
+
+ warn $sql if $DEBUG;
+ my $sth = dbh->prepare($sql) or die dbh->errstr;
+ $sth->execute or die $sth->errstr;