improve concurrency handling for inventory job

internal/tasks/inventoryLifecycle.go

@@ -137,9 +137,15 @@ ORDER BY snapshot_time ASC
 		if err := db.ValidateTableName(t.Table); err != nil {
 			continue
 		}
-		hasRows, err := db.TableHasRows(ctx, dbConn, t.Table)
-		if err != nil || !hasRows {
-			continue
+		if t.Count.Valid {
+			if t.Count.Int64 <= 0 {
+				continue
+			}
+		} else {
+			hasRows, err := db.TableHasRows(ctx, dbConn, t.Table)
+			if err != nil || !hasRows {
+				continue
+			}
 		}
 		tables = append(tables, t)
 	}