• User
• Discussion
• Answer
• Reply
• Tag
• DiscussionTag
• Notification
• UserNotification

There are few models which are not implemented yet but have been added to the database. They are:

• AutomationRule
• AdminSetting
• UserMention

We have created Category model which is associated with User and Discussion. But they are not used in the app. We feel having Tags alone would satisfy categorization.