feat: use shared redis client to maximize pooling usage (#39)

internal/store/redis/helper.go

@@ -91,12 +91,14 @@ func WithRetry(ctx context.Context, client redis.UniversalClient, key string, fn
 				continue
 			}
 
-			return err
+			return errors.WithStack(err)
 		}
 
 		return nil
 	}
 
+	logger.Error(ctx, "redis error", logger.E(errors.WithStack(err)))
+
 	return errors.WithStack(redis.TxFailedErr)
 }