diff --git a/api/models/model.py b/api/models/model.py
index 9883557099f..1a31ef63d73 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -57,6 +57,7 @@ from .types import EnumText, LongText, StringUUID
 
 if TYPE_CHECKING:
     from .agent import Agent
+    from .dataset import DatasetCollectionBinding
     from .workflow import Workflow
 
 
@@ -2122,11 +2123,10 @@ class AppAnnotationSetting(TypeBase):
         init=False,
     )
 
-    @property
-    def collection_binding_detail(self):
+    def collection_binding_detail(self, session: Session) -> DatasetCollectionBinding | None:
         from .dataset import DatasetCollectionBinding
 
-        return db.session.scalar(
+        return session.scalar(
             select(DatasetCollectionBinding).where(DatasetCollectionBinding.id == self.collection_binding_id)
         )
 
diff --git a/api/tests/unit_tests/models/test_app_annotation_setting_session_accessors.py b/api/tests/unit_tests/models/test_app_annotation_setting_session_accessors.py
new file mode 100644
index 00000000000..23b86cd2c38
--- /dev/null
+++ b/api/tests/unit_tests/models/test_app_annotation_setting_session_accessors.py
@@ -0,0 +1,60 @@
+"""Regression coverage for the ``@property``→session-parameter refactor on
+``AppAnnotationSetting.collection_binding_detail``.
+
+The legacy ``@property`` reached for the global ``db.session`` internally and has been converted
+to a plain method taking an explicit ``session: Session`` (per the pattern established in
+#40370/#40797/#41394/#41830, tracked in #40372).
+
+The accessor is exercised against the real ``sqlite_session`` fixture (a genuine SQLAlchemy
+``Session`` bound to a pristine full-schema SQLite database) so the assertions cover actual query
+behaviour rather than a mock's recorded call.
+"""
+
+from uuid import uuid4
+
+from sqlalchemy.orm import Session
+
+from models.dataset import DatasetCollectionBinding
+from models.enums import CollectionBindingType
+from models.model import AppAnnotationSetting
+
+
+def _persist_collection_binding(session: Session) -> DatasetCollectionBinding:
+    binding = DatasetCollectionBinding(
+        collection_name="test_collection",
+        provider_name="test_provider",
+        model_name="test_model",
+        type=CollectionBindingType.DATASET,
+    )
+    session.add(binding)
+    session.flush()
+    return binding
+
+
+def _persist_setting(session: Session, *, collection_binding_id: str) -> AppAnnotationSetting:
+    setting = AppAnnotationSetting(
+        app_id=str(uuid4()),
+        score_threshold=0.8,
+        collection_binding_id=collection_binding_id,
+        created_user_id=str(uuid4()),
+        updated_user_id=str(uuid4()),
+    )
+    session.add(setting)
+    session.flush()
+    return setting
+
+
+class TestAppAnnotationSettingCollectionBindingDetail:
+    def test_returns_the_bound_collection_binding(self, sqlite_session: Session) -> None:
+        binding = _persist_collection_binding(sqlite_session)
+        setting = _persist_setting(sqlite_session, collection_binding_id=binding.id)
+
+        result = setting.collection_binding_detail(session=sqlite_session)
+
+        assert result is not None
+        assert result.id == binding.id
+
+    def test_returns_none_when_binding_missing(self, sqlite_session: Session) -> None:
+        setting = _persist_setting(sqlite_session, collection_binding_id=str(uuid4()))
+
+        assert setting.collection_binding_detail(session=sqlite_session) is None