fix(api): preserve dataset metadata filters (#35700)

api/services/entities/knowledge_entities/knowledge_entities.py

@@ -3,6 +3,7 @@ from typing import Any, Literal
 from pydantic import BaseModel, field_validator
 
 from core.rag.entities import Rule
+from core.rag.entities.metadata_entities import MetadataFilteringCondition
 from core.rag.index_processor.constant.index_type import IndexStructureType
 from core.rag.retrieval.retrieval_methods import RetrievalMethod
 
@@ -83,6 +84,7 @@ class RetrievalModel(BaseModel):
     score_threshold_enabled: bool
     score_threshold: float | None = None
     weights: WeightModel | None = None
+    metadata_filtering_conditions: MetadataFilteringCondition | None = None
 
 
 class MetaDataConfig(BaseModel):