diff --git a/posthog/temporal/data_imports/workflow_activities/create_job_model.py b/posthog/temporal/data_imports/workflow_activities/create_job_model.py
index b404c610c1cad..78e85dfdd182f 100644
--- a/posthog/temporal/data_imports/workflow_activities/create_job_model.py
+++ b/posthog/temporal/data_imports/workflow_activities/create_job_model.py
@@ -8,6 +8,7 @@
 # TODO: remove dependency
 
 from posthog.constants import DATA_WAREHOUSE_TASK_QUEUE_V2
+from posthog.warehouse.data_load.service import delete_external_data_schedule
 from posthog.warehouse.models import ExternalDataJob, ExternalDataSource
 from posthog.warehouse.models.external_data_schema import (
     ExternalDataSchema,
@@ -38,6 +39,13 @@ def create_external_data_job_model_activity(
     close_old_connections()
 
     try:
+        source_exists = ExternalDataSource.objects.filter(id=inputs.source_id).exclude(deleted=True).exists()
+        schema_exists = ExternalDataSchema.objects.filter(id=inputs.schema_id).exclude(deleted=True).exists()
+
+        if not source_exists or not schema_exists:
+            delete_external_data_schedule(str(inputs.schema_id))
+            raise Exception("Source or schema no longer exists - deleted temporal schedule")
+
         job = ExternalDataJob.objects.create(
             team_id=inputs.team_id,
             pipeline_id=inputs.source_id,
diff --git a/posthog/temporal/tests/data_imports/test_end_to_end.py b/posthog/temporal/tests/data_imports/test_end_to_end.py
index 7a953f8d679a2..5c20304085832 100644
--- a/posthog/temporal/tests/data_imports/test_end_to_end.py
+++ b/posthog/temporal/tests/data_imports/test_end_to_end.py
@@ -1,7 +1,7 @@
 from concurrent.futures import ThreadPoolExecutor
 import functools
 import uuid
-from typing import Any, Optional
+from typing import Any, Optional, cast
 from unittest import mock
 
 import aioboto3
@@ -1145,3 +1145,32 @@ async def test_decimal_down_scales(team, postgres_config, postgres_connection):
         await postgres_connection.commit()
 
         await _execute_run(str(uuid.uuid4()), inputs, [])
+
+
+@pytest.mark.django_db(transaction=True)
+@pytest.mark.asyncio
+async def test_missing_source(team, stripe_balance_transaction):
+    inputs = ExternalDataWorkflowInputs(
+        team_id=team.id,
+        external_data_source_id=uuid.uuid4(),
+        external_data_schema_id=uuid.uuid4(),
+    )
+
+    with (
+        pytest.raises(Exception) as e,
+        mock.patch(
+            "posthog.temporal.data_imports.workflow_activities.create_job_model.delete_external_data_schedule"
+        ) as mock_delete_external_data_schedule,
+    ):
+        await _execute_run(str(uuid.uuid4()), inputs, [])
+
+    exc = cast(Any, e)
+
+    assert exc.value is not None
+    assert exc.value.cause is not None
+    assert exc.value.cause.cause is not None
+    assert exc.value.cause.cause.message is not None
+
+    assert exc.value.cause.cause.message == "Source or schema no longer exists - deleted temporal schedule"
+
+    mock_delete_external_data_schedule.assert_called()