improve logging and concurrent vcenter inventory

internal/tasks/inventoryLifecycle.go

@@ -111,13 +111,14 @@ WHERE "Vcenter" = ? AND ("DeletedAt" IS NULL OR "DeletedAt" = 0)
 }
 
 type snapshotTable struct {
-	Table string `db:"table_name"`
-	Time  int64  `db:"snapshot_time"`
+	Table string        `db:"table_name"`
+	Time  int64         `db:"snapshot_time"`
+	Count sql.NullInt64 `db:"snapshot_count"`
 }
 
 func listHourlyTablesForDay(ctx context.Context, dbConn *sqlx.DB, dayStart, dayEnd time.Time) ([]snapshotTable, error) {
 	rows, err := dbConn.QueryxContext(ctx, `
-SELECT table_name, snapshot_time
+SELECT table_name, snapshot_time, snapshot_count
 FROM snapshot_registry
 WHERE snapshot_type = 'hourly' AND snapshot_time >= ? AND snapshot_time < ?
 ORDER BY snapshot_time ASC