Attempt to write items to backfeed_retry set upon error.

main.go

@@ -169,14 +169,30 @@ func (that *ProjectBackfeedManager) Do() {
 			}
 			resultMap[key] = pipe.Do(context.Background(), args...)
 		}
+		var sAddErrItems []any
 		if _, err := pipe.Exec(context.Background()); err != nil {
 			log.Printf("%s", err)
+			for _, items := range keyMap {
+				for _, item := range items {
+					sAddErrItems = append(sAddErrItems, item)
+				}
+			}
+			if err := that.ProjectRedis.SAdd(context.Background(), fmt.Sprintf("%s:backfeed_retry", that.Name), sAddErrItems...).Err(); err != nil {
+				log.Printf("failed to sadd failed items for %s: %s", that.Name, err)
+			}
+			continue
 		}
 		var sAddItems []any
 		for key, items := range keyMap {
 			res, err := resultMap[key].BoolSlice()
 			if err != nil {
 				log.Printf("%s", err)
+				for _, item := range items {
+					sAddErrItems = append(sAddErrItems, item)
+				}
+				if err := that.ProjectRedis.SAdd(context.Background(), fmt.Sprintf("%s:backfeed_retry", that.Name), sAddErrItems...).Err(); err != nil {
+					log.Printf("failed to sadd failed items for %s: %s", that.Name, err)
+				}
 				continue
 			}
 			if len(res) != len(keyMap[key]) {