Resolve notification worker items to tenants

src/govoplan_notifications/backend/capabilities.py

@@ -12,6 +12,17 @@ class SqlNotificationDispatchProvider(NotificationDispatchProvider):
         self._settings = context.settings
         self._registry = context.registry
 
+    def tenant_id_for_notification(
+        self,
+        session: object,
+        *,
+        notification_id: str,
+    ) -> str | None:
+        from govoplan_notifications.backend.db.models import NotificationMessage
+
+        notification = session.get(NotificationMessage, notification_id)  # type: ignore[attr-defined]
+        return notification.tenant_id if notification is not None else None
+
     def enqueue_notification(
         self,
         session: object,