Function: Get metadata for a given notification item.

Function: Update a piece of notification meta.

Function: Add a piece of notification metadata.

Function: Finds and exports personal data associated with an email address from the Notifications tables.

Function: Catch and route the ‘settings’ notifications screen.

Function: Delete a meta entry from the DB for a notification item.

Function: Delete all notifications from a user.

Function: Delete a user’s notifications when the user is deleted.

Function: Deletes user notifications data on the ‘delete_user’ hook.