Cleanup SQL CHARSET and COLLATE

* Set same charset and collate for all tables
* Recommends collate utf8mb4_0900_ai_ci which is MySQL default

application/config/database.sample.php

@@ -88,7 +88,7 @@ $db['default'] = array(
 	'cache_on' => FALSE,
 	'cachedir' => '',
 	'char_set' => 'utf8mb4',
-	'dbcollat' => 'utf8mb4_general_ci',
+	'dbcollat' => 'utf8mb4_0900_ai_ci',
 	'swap_pre' => '',
 	'encrypt' => FALSE,
 	'compress' => FALSE,

application/config/migration.php

@@ -21,8 +21,7 @@ $config['migration_enabled'] = TRUE;
 | be upgraded / downgraded to.
 |
 */
-
-$config['migration_version'] = 83;
+$config['migration_version'] = 84;
 
 /*
 |--------------------------------------------------------------------------

application/migrations/084_fix_collate.php

@@ -0,0 +1,41 @@
+<?php
+defined('BASEPATH') or exit('No direct script access allowed');
+
+class Migration_fix_collate extends CI_Migration
+{
+	public function up()
+	{
+		$tables = array(
+			$this->config->item('table_name'),
+			'adif_modes',
+			'api',
+			'cat',
+			'config',
+			'contest',
+			'dxcc_entities',
+			'dxcc_exceptions',
+			'dxcc_prefixes',
+			'eQSL_images',
+			'iota',
+			'lotw_certs',
+			'migrations',
+			'notes',
+			'options',
+			'qsl_images',
+			'queries',
+			'station_logbooks',
+			'station_logbooks_relationship',
+			'station_profile',
+			'timezones',
+			'users'
+        );
+		foreach ($tables as $table) {
+			$this->db->query('ALTER TABLE ' . $table . ' CONVERT TO CHARACTER SET ' . $this->db->char_set . ' COLLATE ' . $this->db->dbcollat);
+		}
+	}
+
+	public function down()
+	{
+		// Not Possible
+	}
+}