Enhancement (beta): support LLM timeout config (#13002)

src/documents/views.py

@@ -241,6 +241,7 @@ from paperless.serialisers import UserSerializer
 from paperless.views import StandardPagination
 from paperless_ai.ai_classifier import get_ai_document_classification
 from paperless_ai.chat import stream_chat_with_documents
+from paperless_ai.exceptions import LLMTimeoutError
 from paperless_ai.matching import extract_unmatched_names
 from paperless_ai.matching import match_correspondents_by_name
 from paperless_ai.matching import match_document_types_by_name
@@ -1510,6 +1511,17 @@ class DocumentViewSet(
                 exc_info=True,
             )
             raise ValidationError({"ai": [_("Invalid AI configuration.")]}) from exc
+        except LLMTimeoutError as exc:
+            logger.exception(
+                "AI backend timed out while generating suggestions for document %s: %s",
+                doc.pk,
+                exc,
+                exc_info=True,
+            )
+            return Response(
+                {"ai": [_("AI backend request timed out.")]},
+                status=status.HTTP_503_SERVICE_UNAVAILABLE,
+            )
 
         matched_tags = match_tags_by_name(
             llm_suggestions.get("tags", []),