fix averages in aggregation jobs

README.md

@@ -28,6 +28,12 @@ Run `templ generate -path ./components` to generate code based on template files
 ## Documentation
 Run `swag init --exclude "pkg.mod,pkg.build,pkg.tools" -o server/router/docs`
 
+#### Snapshots and Reports
+- Hourly snapshots capture inventory per vCenter (concurrency via `hourly_snapshot_concurrency`).
+- Daily summaries aggregate the hourly snapshots for the day; monthly summaries aggregate daily summaries for the month.
+- Snapshots are registered in `snapshot_registry` so regeneration via `/api/snapshots/aggregate` can locate the correct tables (fallback scanning is also supported).
+- Reports (XLSX with totals/charts) are generated automatically after hourly, daily, and monthly jobs and written to a reports directory.
+
 #### Settings File
 Configuration now lives in the YAML settings file. By default the service reads
 `/etc/dtms/vctp.yml`, or you can override it with the `-settings` flag.
@@ -96,6 +102,7 @@ Snapshots:
 - `settings.hourly_snapshot_max_age_days`: retention for hourly tables
 - `settings.daily_snapshot_max_age_months`: retention for daily tables
 - `settings.snapshot_cleanup_cron`: cron expression for cleanup job
+- `settings.reports_dir`: directory to store generated XLSX reports (default: `/var/lib/vctp/reports`)
 
 Filters/chargeback:
 - `settings.tenants_to_filter`: list of tenant name patterns to exclude