Finished Issue #5, Issue #6 and Issue #3

application/models/admin/Logging_model.php

+<?php
+	class Logging_model extends CI_Model{
+        public function history_write($user_id, $action, $table_name = NULL, $table_id = NULL) {
+            $data = array(
+                'user_id' => $user_id,
+                'action' => $action,
+                'table_name' => $table_name,
+                'table_id' => $table_id,
+            );
+            $this->db->insert('history', $data);
+            return true;
+        }
+	}
+?>
\ No newline at end of file