Remove perf_times table (#12517)

the data is never used... This type of data is better to store in rrd anyway

discovery.php

@@ -121,14 +121,6 @@ $run = ($end - $start);
 $proctime = substr($run, 0, 5);
 
 if ($discovered_devices) {
-    dbInsert([
-        'type' => 'discover',
-        'doing' => $doing,
-        'start' => $start,
-        'duration' => $proctime,
-        'devices' => $discovered_devices,
-        'poller' => \LibreNMS\Config::get('distributed_poller_name'),
-    ], 'perf_times');
     if ($doing === 'new') {
         // We have added a new device by this point so we might want to do some other work
         oxidized_reload_nodes();