Clear artist cache when added to a new group

sections/torrents/add_alias.php

 }
 list($GroupName) = $DB->next_record(MYSQLI_NUM, false);
 
-$Changed = false;
-
 for ($i = 0; $i < count($ArtistNames); $i++) {
   $ArtistName = Artists::normalise_artist_name($ArtistNames[$i]);
 
     $DB->query("
       SELECT ArtistID
       FROM artists_group
-      WHERE Name = '".db_string($ArtistName)."'");
+      WHERE Name = ?", $ArtistName);
 
     if ($DB->has_results())
       list($ArtistID) = $DB->next_record(MYSQLI_NUM, false);
       $ArtistName = db_string($ArtistName);
       $DB->query("
         INSERT INTO artists_group (Name)
-        VALUES ('$ArtistName')");
+        VALUES ( ? )", $ArtistName);
       $ArtistID = $DB->inserted_id();
     }
 
         ('$GroupID', '$ArtistID', '$UserID')");
 
     if ($DB->affected_rows()) {
-      $Changed = true;
       Misc::write_log("Artist $ArtistID ($ArtistName) was added to the group $GroupID ($GroupName) by user ".$LoggedUser['ID'].' ('.$LoggedUser['Username'].')');
       Torrents::write_group_log($GroupID, 0, $LoggedUser['ID'], "added artist $ArtistName", 0);
+      $Cache->delete_value("torrents_details_$GroupID");
+      $Cache->delete_value("groups_artists_$GroupID"); // Delete group artist cache
+      $Cache->delete_value("artist_groups_$ArtistID"); // Delete artist group cache
+      Torrents::update_hash($GroupID);
     }
   }
 }
 
-if ($Changed) {
-  $Cache->delete_value("torrents_details_$GroupID");
-  $Cache->delete_value("groups_artists_$GroupID"); // Delete group artist cache
-  Torrents::update_hash($GroupID);
-}
-
 header('Location: '.$_SERVER['HTTP_REFERER']);
 ?>