diff --git a/app/dao/service_data_retention_dao.py b/app/dao/service_data_retention_dao.py
index b95ca5720..cd2c1fd4b 100644
--- a/app/dao/service_data_retention_dao.py
+++ b/app/dao/service_data_retention_dao.py
@@ -1,3 +1,5 @@
+from sqlalchemy import select, update
+
 from app import db
 from app.dao.dao_utils import autocommit
 from app.models import ServiceDataRetention
@@ -5,29 +7,31 @@ from app.utils import utc_now
 
 
 def fetch_service_data_retention_by_id(service_id, data_retention_id):
-    data_retention = ServiceDataRetention.query.filter_by(
-        service_id=service_id, id=data_retention_id
-    ).first()
-    return data_retention
+    stmt = select(ServiceDataRetention).where(
+        ServiceDataRetention.service_id == service_id,
+        ServiceDataRetention.id == data_retention_id,
+    )
+    return db.session.execute(stmt).scalars().first()
 
 
 def fetch_service_data_retention(service_id):
-    data_retention_list = (
-        ServiceDataRetention.query.filter_by(service_id=service_id)
+    stmt = (
+        select(ServiceDataRetention)
+        .where(ServiceDataRetention.service_id == service_id)
         .order_by(
             # in the order that models.notification_types are created (email, sms, letter)
             ServiceDataRetention.notification_type
         )
-        .all()
     )
-    return data_retention_list
+    return db.session.execute(stmt).scalars().all()
 
 
 def fetch_service_data_retention_by_notification_type(service_id, notification_type):
-    data_retention_list = ServiceDataRetention.query.filter_by(
-        service_id=service_id, notification_type=notification_type
-    ).first()
-    return data_retention_list
+    stmt = select(ServiceDataRetention).where(
+        ServiceDataRetention.service_id == service_id,
+        ServiceDataRetention.notification_type == notification_type,
+    )
+    return db.session.execute(stmt).scalars().first()
 
 
 @autocommit
@@ -46,16 +50,22 @@ def insert_service_data_retention(service_id, notification_type, days_of_retenti
 def update_service_data_retention(
     service_data_retention_id, service_id, days_of_retention
 ):
-    updated_count = ServiceDataRetention.query.filter(
-        ServiceDataRetention.id == service_data_retention_id,
-        ServiceDataRetention.service_id == service_id,
-    ).update({"days_of_retention": days_of_retention, "updated_at": utc_now()})
-    return updated_count
+    stmt = (
+        update(ServiceDataRetention)
+        .where(
+            ServiceDataRetention.id == service_data_retention_id,
+            ServiceDataRetention.service_id == service_id,
+        )
+        .values({"days_of_retention": days_of_retention, "updated_at": utc_now()})
+    )
+    result = db.session.execute(stmt)
+    return result.rowcount
 
 
 def fetch_service_data_retention_for_all_services_by_notification_type(
     notification_type,
 ):
-    return ServiceDataRetention.query.filter(
+    stmt = select(ServiceDataRetention).where(
         ServiceDataRetention.notification_type == notification_type
-    ).all()
+    )
+    return db.session.execute(stmt).scalars().all()
diff --git a/app/dao/service_guest_list_dao.py b/app/dao/service_guest_list_dao.py
index acd39703c..59d381a8b 100644
--- a/app/dao/service_guest_list_dao.py
+++ b/app/dao/service_guest_list_dao.py
@@ -1,11 +1,12 @@
+from sqlalchemy import delete, select
+
 from app import db
 from app.models import ServiceGuestList
 
 
 def dao_fetch_service_guest_list(service_id):
-    return ServiceGuestList.query.filter(
-        ServiceGuestList.service_id == service_id
-    ).all()
+    stmt = select(ServiceGuestList).where(ServiceGuestList.service_id == service_id)
+    return db.session.execute(stmt).scalars().all()
 
 
 def dao_add_and_commit_guest_list_contacts(objs):
@@ -14,6 +15,7 @@ def dao_add_and_commit_guest_list_contacts(objs):
 
 
 def dao_remove_service_guest_list(service_id):
-    return ServiceGuestList.query.filter(
-        ServiceGuestList.service_id == service_id
-    ).delete()
+    stmt = delete(ServiceGuestList).where(ServiceGuestList.service_id == service_id)
+    result = db.session.execute(stmt)
+    db.session.commit()
+    return result.rowcount
diff --git a/app/dao/webauthn_credential_dao.py b/app/dao/webauthn_credential_dao.py
index b34d3c014..4c7a0c888 100644
--- a/app/dao/webauthn_credential_dao.py
+++ b/app/dao/webauthn_credential_dao.py
@@ -1,13 +1,16 @@
+from sqlalchemy import select
+
 from app import db
 from app.dao.dao_utils import autocommit
 from app.models import WebauthnCredential
 
 
 def dao_get_webauthn_credential_by_user_and_id(user_id, webauthn_credential_id):
-    return WebauthnCredential.query.filter(
+    stmt = select(WebauthnCredential).where(
         WebauthnCredential.user_id == user_id,
         WebauthnCredential.id == webauthn_credential_id,
-    ).one()
+    )
+    return db.session.execute(stmt).scalars().one()
 
 
 @autocommit