fix retrival resource miss in chatflow (#18307)

api/controllers/web/message.py

         "retriever_resources": fields.List(fields.Nested(retriever_resource_fields)),
         "created_at": TimestampField,
         "agent_thoughts": fields.List(fields.Nested(agent_thought_fields)),
+        "metadata": fields.Raw(attribute="message_metadata_dict"),
         "status": fields.String,
         "error": fields.String,
     }

api/core/callback_handler/index_tool_callback_handler.py

 from extensions.ext_database import db
 from models.dataset import ChildChunk, DatasetQuery, DocumentSegment
 from models.dataset import Document as DatasetDocument
-from models.model import DatasetRetrieverResource
 
 
 class DatasetIndexToolCallbackHandler:
 
     def return_retriever_resource_info(self, resource: list):
         """Handle return_retriever_resource_info."""
-        if resource and len(resource) > 0:
-            for item in resource:
-                dataset_retriever_resource = DatasetRetrieverResource(
-                    message_id=self._message_id,
-                    position=item.get("position") or 0,
-                    dataset_id=item.get("dataset_id"),
-                    dataset_name=item.get("dataset_name"),
-                    document_id=item.get("document_id"),
-                    document_name=item.get("document_name"),
-                    data_source_type=item.get("data_source_type"),
-                    segment_id=item.get("segment_id"),
-                    score=item.get("score") if "score" in item else None,
-                    hit_count=item.get("hit_count") if "hit_count" in item else None,
-                    word_count=item.get("word_count") if "word_count" in item else None,
-                    segment_position=item.get("segment_position") if "segment_position" in item else None,
-                    index_node_hash=item.get("index_node_hash") if "index_node_hash" in item else None,
-                    content=item.get("content"),
-                    retriever_from=item.get("retriever_from"),
-                    created_by=self._user_id,
-                )
-                db.session.add(dataset_retriever_resource)
-                db.session.commit()
-
         self._queue_manager.publish(
             QueueRetrieverResourcesEvent(retriever_resources=resource), PublishFrom.APPLICATION_MANAGER
         )

api/models/model.py

 
     @property
     def retriever_resources(self):
-        return (
-            db.session.query(DatasetRetrieverResource)
-            .filter(DatasetRetrieverResource.message_id == self.id)
-            .order_by(DatasetRetrieverResource.position.asc())
-            .all()
-        )
+        return self.message_metadata_dict.get("retriever_resources") if self.message_metadata else []
 
     @property
     def message_files(self):