feat: replace pipeline profile and source health

apps/jobs/services/applications.py

@@ -274,6 +274,31 @@ def track_application_changes(
     return events
 
 
+def change_application_status(*, application: Application, user, status: str) -> Application:
+    """Persist an accessible pipeline status change and its audit event."""
+
+    valid_statuses = {value for value, _label in Application.Status.choices}
+    if status not in valid_statuses:
+        raise ValueError("Ongeldige sollicitatiestatus.")
+    previous = application.status
+    if previous == status:
+        return application
+    with transaction.atomic():
+        application.status = status
+        update_fields = ["status", "updated_at"]
+        if status == Application.Status.APPLIED and application.applied_at is None:
+            application.applied_at = timezone.now()
+            update_fields.append("applied_at")
+        application.save(update_fields=update_fields)
+        _record_timeline_event(
+            application=application,
+            user=user,
+            event_type=ApplicationTimelineEvent.EventType.STATUS_CHANGED,
+            metadata={"from": previous, "to": status},
+        )
+    return application
+
+
 def build_print_html(application: Application) -> str:
     snapshot = application.snapshot if isinstance(application.snapshot, dict) else {}
     job = application.job