try to reconnect to the DB if rebuildLineage.pl takes a long time

docs/changelog/7.x.x.txt

@@ -11,6 +11,7 @@
  - Change Group INSERT to REPLACE to prevent merge problems in multi-master DB clusters
  - added #12078: Add alt tag to default Image template
  - fixed #12077: Carousel update not possible
+ - Try to reconnect to MySQL if sbin/rebuildLineage.pl takes too long
 
 7.10.11
  - fixed #12057: WebGUI::Search, assetIds search clause

sbin/rebuildLineage.pl

@@ -42,6 +42,8 @@ pod2usage() unless (defined($configFile) && $configFile ne '');
 
 print "Starting..." unless ($quiet);
 my $session = WebGUI::Session->open($webguiRoot,$configFile);
+# We might take a while, reconnect if we get disconnected for inactivity
+$session->db->dbh->{mysql_auto_reconnect} = 1;
 print "OK\n" unless ($quiet);
 
 print "Looking for descendant replationships...\n" unless ($quiet);