* Initial work on #15621
* Signal receiver should ignore models which don't support notifications
* Flesh out NotificationGroup functionality
* Add NotificationGroup filters for users & groups
* Separate read & dimiss actions
* Enable one-click dismissals from notifications list
* Include total notification count in dropdown
* Drop 'kind' field from Notification model
* Register event types in the registry; add colors & icons
* Enable event rules to target notification groups
* Define dynamic choices for Notification.event_name
* Move event registration to core
* Add more job events
* Misc cleanup
* Misc cleanup
* Correct absolute URLs for notifications & subscriptions
* Optimize subscriber notifications
* Use core event types when queuing events
* Standardize queued event attribute to event_type; change content_type to object_type
* Rename Notification.event_name to event_type
* Restore NotificationGroupBulkEditView
* Add API tests
* Add view & filterset tests
* Add model documentation
* Fix tests
* Update notification bell when notifications have been cleared
* Ensure subscribe button appears only on relevant models
* Notifications/subscriptions cannot be ordered by object
* Misc cleanup
* Add event icon & type to notifications table
* Adjust icon sizing
* Mute color of read notifications
* Misc cleanup
* WIP
* WIP
* Add git sync
* Fix file hashing
* Add last_synced to DataSource
* Build out UI & API resources
* Add status field to DataSource
* Add UI control to sync data source
* Add API endpoint to sync data sources
* Fix display of DataSource job results
* DataSource password should be write-only
* General cleanup
* Add data file UI view
* Punt on HTTP, FTP support for now
* Add DataSource URL validation
* Add HTTP proxy support to git fetcher
* Add management command to sync data sources
* DataFile REST API endpoints should be read-only
* Refactor fetch methods into backend classes
* Replace auth & git branch fields with general-purpose parameters
* Fix last_synced time
* Render discrete form fields for backend parameters
* Enable dynamic edit form for DataSource
* Register DataBackend classes in application registry
* Add search indexers for DataSource, DataFile
* Add single & bulk delete views for DataFile
* Add model documentation
* Convert DataSource to a primary model
* Introduce pre_sync & post_sync signals
* Clean up migrations
* Rename url to source_url
* Clean up filtersets
* Add API & filterset tests
* Add view tests
* Add initSelect() to HTMX refresh handler
* Render DataSourceForm fieldsets dynamically
* Update compiled static resources
