* Prepare factories and associations for Users::DeleteActivity specs
* Altered user associations, delete the needed associations in Users::DeleteActivity
* Moved and refined user deletion spec
* Removed useless commented user associations
* Refactored BackupData factory
* Refactored ProfilePin factory
* Refactored Reaction factory
* Fixed specs: Keep default _type in factories or specify it in tests
* Ok, notes shouldn't be deleted on user deletion
* Fixed creating reactable for specs
* Specify commentable/commentable_type explicitly when creating data for tests
* Fixed typo in the comments spec
* Removed unnneeded space
* Added aggregate_failures for testing user associations deletion
* Keep feedback_messages while deleting user activities
* Add MVP of notification subscriptions
* Add rate limiting for notification subscriptions
* Show modal for logged out users on subscribe click
* Add enter key functionality for checkbox
* Add relationships for notification subscriptions
* Add model test for notification subscription
* Deprecated article mutes in favor of notification subscriptions
* Deprecated comment mutes in favor of notification subscriptions
* Move comment muting tests and logic over
* Merge comment and article muting into subscriptions
* Remove redundant check
* Use database to check for rate limit instead of cache
* Test for subscriptions handling notifications properly
* Fix notification model spec for subscriptions
* Fix tests for subscriptions
* Remove rate limiting
* Properly handle logged out users getting subscription status
* Fix test for new pattern
* Update reserved words
* Add config column to notification subscriptions
* Add logic for top level config and move tests
* Test for top level subscribers getting notified
* Fix logic mistake oops
* Add index and refactor comment_user_ids
