generate excel worksheets when data is available instead of on-demand

internal/settings/settings.go

@@ -40,6 +40,7 @@ type SettingsYML struct {
 		HourlySnapshotMaxAgeDays         int      `yaml:"hourly_snapshot_max_age_days"`
 		DailySnapshotMaxAgeMonths        int      `yaml:"daily_snapshot_max_age_months"`
 		SnapshotCleanupCron              string   `yaml:"snapshot_cleanup_cron"`
+		ReportsDir                       string   `yaml:"reports_dir"`
 		HourlyJobTimeoutSeconds          int      `yaml:"hourly_job_timeout_seconds"`
 		HourlySnapshotTimeoutSeconds     int      `yaml:"hourly_snapshot_timeout_seconds"`
 		DailyJobTimeoutSeconds           int      `yaml:"daily_job_timeout_seconds"`