Add System Update #19, which removes a few redundant legacy entries from modules table

wire/modules/System/SystemUpdater/SystemUpdate19.php

@@ -0,0 +1,28 @@
+<?php namespace ProcessWire;
+
+/**
+ * Clear legacy and irrelevant entries from modules table
+ *
+ */
+class SystemUpdate19 extends SystemUpdate {
+	public function execute() {
+		$this->wire()->addHookAfter('ProcessWire::ready', $this, 'executeAtReady');
+		return 0; // indicates we will update system version ourselves when ready
+	}
+	public function executeAtReady() {
+		$database = $this->wire()->database;
+		$modules = $this->wire()->modules;
+		$query = $database->prepare('DELETE FROM modules WHERE class=:name');
+		$qty = 0;
+		foreach(array('ProcessPage', 'InputfieldWrapper', 'FieldtypeNumber') as $name) {
+			if($modules->isInstalled($name)) continue;
+			$query->bindValue(':name', $name);
+			$query->execute();
+			if($query->rowCount()) $qty++;
+		}
+		$query->closeCursor();
+		if($qty) $this->message("Removed $qty redundant modules table entries", Notice::debug); 
+		$this->updater->saveSystemVersion(19);
+	}
+}
+

wire/modules/System/SystemUpdater/SystemUpdater.module

@@ -26,7 +26,7 @@ class SystemUpdater extends WireData implements Module, ConfigurableModule {
 			 * This version number is important, as this updater keeps the systemVersion up with this version
 			 *
 			 */
-			'version' => 18, 
+			'version' => 19, 
 		);
 	}