postgres optimisations and daily sqlite vacuum

internal/settings/settings.go

@@ -52,6 +52,7 @@ type SettingsYML struct {
 		NodeChargeClusters               []string `yaml:"node_charge_clusters"`
 		SrmActiveActiveVms               []string `yaml:"srm_activeactive_vms"`
 		VcenterAddresses                 []string `yaml:"vcenter_addresses"`
+		PostgresWorkMemMB                int      `yaml:"postgres_work_mem_mb"`
 	} `yaml:"settings"`
 }