added optimizeTable() method

Author: nikiedev

lib/Db.class.php

@@ -618,6 +618,19 @@ public function delete($table, $params = [])
 }
 }
 
+/**
+ * @param $table
+ *
+ * @return bool
+ */
+public function optimizeTable($table)
+{
+$sql_str = 'OPTIMIZE TABLE ' . $this->prefix . $table;
+$this->query = $this->dbh->prepare($sql_str);
+
+return $this->query->execute();
+}
+
 /**
  * @param $table
  *