Helpdesk DB structure

The DB structure is pretty self-explanatory. Some tables have a legacy "hd" prefix, like "hdUsers", newer table don't have it. Here's a quick overview:

hdUsers - stores user accounts
hdIssues - stores support tickets
hdComments - stores replies (AKA ticket-comments)
hdFileAttachments - has file attachments for both tickets and knowledge-base articles
hdCategories and hdSections contain ticket categories and sections respectively
hdCommentTemplates - has canned responses
KBArticles - for knowledge-base articles
hdCustomFields - custom fields for both tickets and assets
hdAssets - assets
hdCategoryPermissions - store user permissions to particular categories (i.e. is he a "technician" for a category)
etc. etc.

Most table names are pretty self-explanatory so you'll have no problem identifying which table has which data.