diff --git a/sql/moz-fx-data-shared-prod/firefox_desktop_derived/baseline_clients_last_seen_v1/backfill.yaml b/sql/moz-fx-data-shared-prod/firefox_desktop_derived/baseline_clients_last_seen_v1/backfill.yaml
new file mode 100644
index 00000000000..53d0085a642
--- /dev/null
+++ b/sql/moz-fx-data-shared-prod/firefox_desktop_derived/baseline_clients_last_seen_v1/backfill.yaml
@@ -0,0 +1,9 @@
+2025-02-10:
+  start_date: 2021-12-01
+  end_date: 2021-12-31
+  reason: DAU computations based on baseline ping [DENG-7839]
+  watchers:
+    - gkatre@mozilla.com
+  status: Initiate
+  shredder_mitigation: false
+  override_retention_limit: true