Method: Deletes all the notifications for all users by item id, and optional secondary item id, and component name and action.

Method: Delete all the notifications that have a specific item id, component name and action.

Method: Deletes all the notifications sent by a specific user, by component and action.

Method: Fetches all the notifications in the database for a specific user.

Method: Delete all the notifications for a user based on the component name and action.

Method: Fetches the notification data from the database.

Method: Check the access for a user.

Method: Constructor

Method: Update or insert notification details into the database.