fix[BE]Reset chickin pending usage and skip zero entries

internal/modules/production/chickins/services/chickin.service.go

@@ -572,6 +572,7 @@ func (s *chickinService) convertChickinsToTarget(ctx *fiber.Ctx, chickins []enti
 	}
 
 	ProjectFlockPopulationRepotx := s.ProjectflockPopulationRepo.WithTx(dbTransaction)
+	chickinRepoTx := s.Repository.WithTx(dbTransaction)
 
 	var totalQuantityAdded float64
 
@@ -601,6 +602,13 @@ func (s *chickinService) convertChickinsToTarget(ctx *fiber.Ctx, chickins []enti
 			return err
 		}
 
+		// Reset PendingUsageQty to 0 since population has been created
+		if err := chickinRepoTx.PatchOne(ctx.Context(), chickin.Id, map[string]any{
+			"pending_usage_qty": 0,
+		}, nil); err != nil {
+			return fmt.Errorf("failed to reset pending usage qty for chickin %d: %w", chickin.Id, err)
+		}
+
 		totalQuantityAdded += quantityToConvert
 	}