diff --git a/backend/app/db/models/hubspot_deal_data.py b/backend/app/db/models/hubspot_deal_data.py
index 48a6f1ba0..036610340 100644
--- a/backend/app/db/models/hubspot_deal_data.py
+++ b/backend/app/db/models/hubspot_deal_data.py
@@ -71,6 +71,10 @@ class HubspotDealData(SQLModel, table=True):
     confirmed_survey_time: Optional[str] = Field(default=None)
     surveyed_date: Optional[datetime] = Field(default=None)
     design_type: Optional[str] = Field(default=None)
+    # OpenHousing job number; HubSpot property ID is client_booking_reference.
+    # Column is created by a drizzle migration in the TS frontend repo, which
+    # must deploy before this model change (issue #1478).
+    job_no: Optional[str] = Field(default=None)
 
     survey_type: Optional[str] = Field(default=None)
     measures_for_pibi_ordered: Optional[str] = Field(default=None)
diff --git a/etl/hubspot/tests/test_hubspot_deal_differ.py b/etl/hubspot/tests/test_hubspot_deal_differ.py
index c3e24e08f..5e9bcfdfa 100644
--- a/etl/hubspot/tests/test_hubspot_deal_differ.py
+++ b/etl/hubspot/tests/test_hubspot_deal_differ.py
@@ -1226,3 +1226,55 @@ def test_db_update_trigger__listing_changed__returns_true() -> None:
     )
 
     assert result is True
+
+
+def test_db_update_trigger__client_booking_reference_changed__returns_true() -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        job_no=None,
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        hs_object_id="1",
+        client_booking_reference="AD0226519",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_db_update_trigger(
+        new_deal=new_deal,
+        new_company=None,
+        new_listing=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is True
+
+
+def test_db_update_trigger__client_booking_reference_unchanged__returns_false() -> None:
+    deal_id = uuid.uuid4()
+
+    # Arrange
+    old_deal = make_old_deal(
+        id=deal_id,
+        job_no="AD0226519",
+    )
+    new_deal = make_new_deal(
+        deal_id,
+        hs_object_id="1",
+        client_booking_reference="AD0226519",
+    )
+
+    # Act
+    result = HubspotDealDiffer.check_for_db_update_trigger(
+        new_deal=new_deal,
+        new_company=None,
+        new_listing=None,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert result is False