diff --git a/apps/api/src/services/awooop_truth_chain_service.py b/apps/api/src/services/awooop_truth_chain_service.py
index aac080349..8a6db6cb1 100644
--- a/apps/api/src/services/awooop_truth_chain_service.py
+++ b/apps/api/src/services/awooop_truth_chain_service.py
@@ -158,6 +158,13 @@ def _inbound_lookup_branch_limit(limit: int) -> int:
     return max(1, min(int(limit), _INBOUND_LOOKUP_BRANCH_LIMIT))
 
 
+def _outbound_database_cutoff(value: datetime) -> datetime:
+    """Match the production outbound table's naive-UTC timestamp contract."""
+    if value.tzinfo is None:
+        return value
+    return value.astimezone(UTC).replace(tzinfo=None)
+
+
 async def _fetch_inbound_conversation_event_rows(
     db: Any,
     *,
@@ -440,7 +447,7 @@ async def _fetch_outbound_rows_for_incidents(
         "incident_ids": source_ids,
     }
     if cutoff is not None:
-        base_params["cutoff"] = cutoff
+        base_params["cutoff"] = _outbound_database_cutoff(cutoff)
 
     async def fetch_branch(
         where_sql: str, params: dict[str, Any] | None = None
diff --git a/apps/api/tests/test_awooop_truth_chain_service.py b/apps/api/tests/test_awooop_truth_chain_service.py
index a89e694e6..846abedf1 100644
--- a/apps/api/tests/test_awooop_truth_chain_service.py
+++ b/apps/api/tests/test_awooop_truth_chain_service.py
@@ -233,6 +233,8 @@ async def test_batch_outbound_lookup_never_casts_full_envelope_to_text(
     assert all("source_envelope::text" not in sql for sql, _ in calls)
     assert all("FROM unnest" not in sql for sql, _ in calls)
     assert all("content_preview ILIKE" not in sql for sql, _ in calls)
+    assert all(params["cutoff"] == cutoff.replace(tzinfo=None) for _, params in calls)
+    assert all(params["cutoff"].tzinfo is None for _, params in calls)
 
 
 def test_ansible_audit_keeps_external_incident_id_in_json_not_bigint_column() -> None: