fixup! Postgres db macro

ansible/plays/templates/macro/postgres.j2

@@ -31,6 +31,7 @@
       - POSTGRES_DB={{ db | mandatory }}
       - POSTGRES_PASSWORD={{ pass | mandatory }}
       - POSTGRES_EXTRA_OPTS=-Z6 --schema=public --blobs
+      - REMOVE_BEFORE=3 # keep 3 days of backups
       - SCHEDULE={{ schedule | mandatory }}
 {% endmacro %}