fix one optional

api/models/dataset.py

@@ -47,7 +47,7 @@ class Dataset(Base):
     PROVIDER_LIST = ["vendor", "external", None]
 
     id = mapped_column(StringUUID, server_default=db.text("uuid_generate_v4()"))
-    tenant_id = mapped_column(StringUUID, nullable=False)
+    tenant_id: Mapped[str] = mapped_column(StringUUID)
     name: Mapped[str] = mapped_column(db.String(255))
     description = mapped_column(db.Text, nullable=True)
     provider: Mapped[str] = mapped_column(db.String(255), server_default=db.text("'vendor'::character varying"))
@@ -59,8 +59,8 @@ class Dataset(Base):
     created_at = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
     updated_by = mapped_column(StringUUID, nullable=True)
     updated_at = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
-    embedding_model: Mapped[Optional[str]] = mapped_column(db.String(255), nullable=True)
-    embedding_model_provider: Mapped[Optional[str]] = mapped_column(db.String(255), nullable=True)
+    embedding_model: Mapped[str] = mapped_column(db.String(255))
+    embedding_model_provider: Mapped[str] = mapped_column(db.String(255))
     collection_binding_id = mapped_column(StringUUID, nullable=True)
     retrieval_model = mapped_column(JSONB, nullable=True)
     built_in_field_enabled = mapped_column(db.Boolean, nullable=False, server_default=db.text("false"))