diff --git a/db/zm_create.sql.in b/db/zm_create.sql.in
index ef13ab924..f9ac3b6d2 100644
--- a/db/zm_create.sql.in
+++ b/db/zm_create.sql.in
@@ -209,11 +209,12 @@ CREATE TABLE `Events` (
   `StateId` int(10) unsigned NOT NULL,
   `Orientation` enum('0','90','180','270','hori','vert') NOT NULL default '0',
   `DiskSpace`   bigint unsigned default NULL,
-  PRIMARY KEY (`Id`,`MonitorId`),
+  PRIMARY KEY (`Id`),
   KEY `MonitorId` (`MonitorId`),
   KEY `StartTime` (`StartTime`),
   KEY `Frames` (`Frames`),
-  KEY `Archived` (`Archived`)
+  KEY `Archived` (`Archived`),
+  KEY `EndTime_DiskSpace` (`EndTime`,`DiskSpace`)
 ) ENGINE=@ZM_MYSQL_ENGINE@;
 
 --
@@ -669,7 +670,25 @@ insert into Users VALUES (NULL,'admin',password('admin'),'',1,'View','Edit','Edi
 --
 -- Add a sample filter to purge the oldest 100 events when the disk is 95% full
 --
-insert into Filters values (NULL,'PurgeWhenFull','{"sort_field":"Id","terms":[{"val":0,"attr":"Archived","op":"="},{"cnj":"and","val":95,"attr":"DiskPercent","op":">="}],"limit":100,"sort_asc":1}',0,0,0,0,0,0,'',1,0,1,0);
+  `Id` int(10) unsigned NOT NULL auto_increment,
+  `Name` varchar(64) NOT NULL default '',
+  `Query` text NOT NULL,
+  `AutoArchive` tinyint(3) unsigned NOT NULL default '0',
+  `AutoVideo` tinyint(3) unsigned NOT NULL default '0',
+  `AutoUpload` tinyint(3) unsigned NOT NULL default '0',
+  `AutoEmail` tinyint(3) unsigned NOT NULL default '0',
+  `AutoMessage` tinyint(3) unsigned NOT NULL default '0',
+  `AutoExecute` tinyint(3) unsigned NOT NULL default '0',
+  `AutoExecuteCmd` tinytext,
+  `AutoDelete` tinyint(3) unsigned NOT NULL default '0',
+  `AutoMove` tinyint(3) unsigned NOT NULL default '0',
+  `AutoMoveTo`  smallint(5) unsigned NOT NULL default 0,
+  `UpdateDiskSpace` tinyint(3) unsigned NOT NULL default '0',
+  `Background` tinyint(1) unsigned NOT NULL default '0',
+  `Concurrent` tinyint(1) unsigned NOT NULL default '0',
+
+insert into Filters values (NULL,'PurgeWhenFull','{"sort_field":"Id","terms":[{"val":0,"attr":"Archived","op":"="},{"cnj":"and","val":95,"attr":"DiskPercent","op":">="}],"limit":100,"sort_asc":1}',0/*AutoArchive*/,0/*AutoVideo*/,0/*AutoUpload*/,0/*AutoEmail*/,0/*AutoMessage*/,0/*AutoExecute*/,'',1/*AutoDelete*/,0/*AutoMove*/,0/*MoveTo*/,0/*UpdateDiskSpace*/,1/*Background*/,0/*Concurrent*/);
+insert into Filters values (NULL,'Update DiskSpace','{"terms":[{"attr":"DiskSpace","op":"IS","val":"NULL"}]}',0,0,0,0,0,0,'',0,0,0,1,1,0);
 
 --
 -- Add in some sample control protocol definitions
diff --git a/db/zm_update-1.31.18.sql b/db/zm_update-1.31.18.sql
index 56e15dd3a..5ba3b6caa 100644
--- a/db/zm_update-1.31.18.sql
+++ b/db/zm_update-1.31.18.sql
@@ -10,3 +10,14 @@ SET @s = (SELECT IF(
 
 PREPARE stmt FROM @s;
 EXECUTE stmt;
+
+SET @s = (SELECT IF(
+    (SELECT COUNT(*) FROM Filters WHERE Name = 'Update DiskSpace'
+      AND Query = '{"terms":[{"attr":"DiskSpace","op":"IS","val":"NULL"}]}'
+    ) > 0,
+    "SELECT 'Update Disk Space Filter already exists.'",
+    "INSERT INTO Filters (Name,Query,UpdateDiskSpace,Background) values ('Update DiskSpace','{\"terms\":[{\"attr\":\"DiskSpace\",\"op\":\"IS\",\"val\":\"NULL\"}]}',1,1)"
+    ));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;
diff --git a/scripts/zmaudit.pl.in b/scripts/zmaudit.pl.in
index 2de067c3e..e1c97e448 100644
--- a/scripts/zmaudit.pl.in
+++ b/scripts/zmaudit.pl.in
@@ -238,8 +238,13 @@ MAIN: while( $loop ) {
       } elsif ( $$Storage{Scheme} eq 'Medium' ) {
         foreach my $event_dir ( glob("$monitor_dir/*/*") ) {
           next if ! -d $event_dir;
-          my $Event = $fs_events->{$event} = new ZoneMinder::Event();
-          $$Event{Id} = $event;
+          my ( $date, $event_id ) = $event_dir =~ /^$monitor_dir\/(\d{4}\-\d{2}\-\d{2})\/(\d\+)$/;
+          if ( ! $event_id ) {
+            Debug("Unable to parse date/event_id from $event_dir");
+            next;
+          }
+          my $Event = $fs_events->{$event_id} = new ZoneMinder::Event();
+          $$Event{Id} = $event_id;
           $$Event{Path} = $event_dir;
           $Event->MonitorId( $monitor_dir );
           $Event->StorageId( $Storage->Id() );
diff --git a/version b/version
index 874058d96..d1be1a9fa 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-1.31.17
+1.31.18
diff --git a/web/api/app/Config/bootstrap.php.in b/web/api/app/Config/bootstrap.php.in
index cc096f233..d1cd7857d 100644
--- a/web/api/app/Config/bootstrap.php.in
+++ b/web/api/app/Config/bootstrap.php.in
@@ -142,6 +142,27 @@ foreach( $configvals as $key => $value) {
   Configure::write( $key, $value );
 }
 
+// For Human-readability, use ZM_SERVER_HOST or ZM_SERVER_NAME in zm.conf, and convert it here to a ZM_SERVER_ID
+if ( ! defined('ZM_SERVER_ID') ) {
+  App::uses('ClassRegistry', 'Utility');
+  $ServerModel = ClassRegistry::init('Server');
+  if ( defined('ZM_SERVER_NAME') and ZM_SERVER_NAME ) {
+    $Server = $ServerModel->find( 'first', array( 'conditions'=>array('Name'=>ZM_SERVER_NAME) ) );
+    if ( ! $Server ) {
+      Error('Invalid Multi-Server configration detected. ZM_SERVER_NAME set to ' . ZM_SERVER_NAME . ' in zm.conf, but no corresponding entry found in Servers table.');
+    } else {
+      define( 'ZM_SERVER_ID', $Server['Server']['Id'] );
+    }
+  } else if ( defined('ZM_SERVER_HOST') and ZM_SERVER_HOST ) {
+    $Server = $ServerModel->find( 'first', array( 'conditions'=>array('Name'=>ZM_SERVER_HOST) ) );
+    if ( ! $Server ) {
+      Error('Invalid Multi-Server configration detected. ZM_SERVER_HOST set to ' . ZM_SERVER_HOST . ' in zm.conf, but no corresponding entry found in Servers table.');
+    } else {
+      define( 'ZM_SERVER_ID', $Server['Server']['Id'] );
+    }
+  }
+}
+
 function process_configfile($configFile) {
   if ( is_readable( $configFile ) ) {
     $configvals = array();