diff --git a/backend/pashub_fetcher/handler/requirements.txt b/backend/pashub_fetcher/handler/requirements.txt
index ba235c7f..17d80d90 100644
--- a/backend/pashub_fetcher/handler/requirements.txt
+++ b/backend/pashub_fetcher/handler/requirements.txt
@@ -11,3 +11,4 @@ pytz
 boto3==1.35.44
 pandas==2.2.2
 numpy<2.0
+pymupdf
diff --git a/backend/pashub_fetcher/local_handler/invoke_local_lambda.py b/backend/pashub_fetcher/local_handler/invoke_local_lambda.py
index 5248a874..90381a0c 100644
--- a/backend/pashub_fetcher/local_handler/invoke_local_lambda.py
+++ b/backend/pashub_fetcher/local_handler/invoke_local_lambda.py
@@ -14,7 +14,7 @@ payload = {
                 {
                     "pashub_link": "https://google.co.uk",
                     "uprn": "123456",
-                    "hubspot_deal_id": "498926855369",
+                    "hubspot_deal_id": "1",
                 }
             )
         }
diff --git a/etl/hubspot/hubspotDataTodB.py b/etl/hubspot/hubspotDataTodB.py
index 278fbe43..b160d563 100644
--- a/etl/hubspot/hubspotDataTodB.py
+++ b/etl/hubspot/hubspotDataTodB.py
@@ -95,8 +95,12 @@ class HubspotDataToDb:
         with db_read_session() as session:
             deal_id = deal_data.get("hs_object_id")
 
-            self._sync_owner_to_db(deal_data.get("coordinator_user"), hubspot_client, session)
-            self._sync_owner_to_db(deal_data.get("designer_user"), hubspot_client, session)
+            self._sync_owner_to_db(
+                deal_data.get("coordinator_user"), hubspot_client, session
+            )
+            self._sync_owner_to_db(
+                deal_data.get("designer_user"), hubspot_client, session
+            )
 
             statement = select(HubspotDealData).where(
                 HubspotDealData.deal_id == deal_id
@@ -256,7 +260,7 @@ class HubspotDataToDb:
             ),
             "domna_survey_date": parse_hs_date(deal_data.get("osmosis_survey_date")),
         }.items():
-            setattr(existing, attr, value or getattr(existing, attr))
+            setattr(existing, attr, value)
 
     def _build_new_deal(
         self,
diff --git a/etl/hubspot/tests/test_hubspot_data_to_db.py b/etl/hubspot/tests/test_hubspot_data_to_db.py
new file mode 100644
index 00000000..339e0377
--- /dev/null
+++ b/etl/hubspot/tests/test_hubspot_data_to_db.py
@@ -0,0 +1,34 @@
+from etl.hubspot.hubspotDataTodB import HubspotDataToDb
+from backend.app.db.models.hubspot_deal_data import HubspotDealData
+
+
+def _make_instance() -> HubspotDataToDb:
+    return HubspotDataToDb.__new__(HubspotDataToDb)
+
+
+def test_update_existing_deal__designer_cleared_to_none__overwrites_existing() -> None:
+    existing = HubspotDealData(deal_id="MOCK_DEAL_ID", designer="Old Designer")
+    deal_data = {"designer_user": None}
+
+    _make_instance()._update_existing_deal(
+        existing=existing,
+        deal_data=deal_data,
+        listing=None,
+        company=None,
+    )
+
+    assert existing.designer is None
+
+
+def test_update_existing_deal__designer_set__overwrites_existing() -> None:
+    existing = HubspotDealData(deal_id="MOCK_DEAL_ID", designer="Old Designer")
+    deal_data = {"designer_user": "New Designer"}
+
+    _make_instance()._update_existing_deal(
+        existing=existing,
+        deal_data=deal_data,
+        listing=None,
+        company=None,
+    )
+
+    assert existing.designer == "New Designer"