Restore initial data type of frequency column in cat table

Signed-off-by: phl0 <github@florian-wolters.de>

application/config/migration.php

@@ -21,7 +21,7 @@ $config['migration_enabled'] = TRUE;
 | be upgraded / downgraded to.
 |
 */
-$config['migration_version'] = 100;
+$config['migration_version'] = 101;
 
 /*
 |--------------------------------------------------------------------------

application/migrations/101_make_frequency_bigint_again.php

@@ -0,0 +1,45 @@
+<?php
+
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/*
+   Restore initial field settings for frequency as it
+   broke with commit f6feea5
+*/
+
+class Migration_make_frequency_bigint_again extends CI_Migration {
+
+    public function up()
+    {
+        if ($this->db->table_exists('cat')) {
+            if ($this->db->field_exists('frequency', 'cat')) {
+                $fields = array(
+                    'frequency' => array(
+                        'name' => 'frequency',
+                        'type' => 'BIGINT',
+                        'null' => TRUE,
+                        'default' => NULL,
+                    ),
+                );
+                $this->dbforge->modify_column('cat', $fields);
+            }
+        }
+    }
+
+    public function down()
+    {
+        if ($this->db->table_exists('cat')) {
+            if ($this->db->field_exists('frequency', 'cat')) {
+                $fields = array(
+                    'frequency' => array(
+                        'name' => 'frequency',
+                        'type' => 'VARCHAR(10)',
+                        'null' => TRUE,
+                        'default' => NULL,
+                    ),
+                );
+                $this->dbforge->modify_column('cat', $fields);
+            }
+        }
+    }
+}