avoid vcenter totals pages scanning whole database

README.md

@@ -80,6 +80,13 @@ use:
 vctp -settings /path/to/vctp.yml -db-cleanup
 ```
 
+If you want a one-time cache backfill for the vCenter totals cache tables
+(`vcenter_latest_totals` and `vcenter_aggregate_totals`) and exit, use:
+
+```shell
+vctp -settings /path/to/vctp.yml -backfill-vcenter-cache
+```
+
 ## Database Configuration
 By default the app uses SQLite and creates/opens `db.sqlite3`.