initial refactori trasnfer to laying, and depretitation to 25 week

internal/common/repository/common.hppv2.repository.go

@@ -102,11 +102,17 @@ type HppV2CostRepository interface {
 	GetProjectFlockKandangContext(ctx context.Context, projectFlockKandangId uint) (*HppV2ProjectFlockKandangContext, error)
 	GetProjectFlockKandangIDs(ctx context.Context, projectFlockId uint) ([]uint, error)
 	GetLatestTransferInputByProjectFlockKandangID(ctx context.Context, projectFlockKandangId uint, period time.Time) (*HppV2LatestTransferInputRow, error)
+	// GetAllTransferInputsByProjectFlockKandangID return SEMUA approved transfer ke target kandang
+	// itu, untuk skenario multi-source di mana 1 target menerima dari multiple transfer terpisah.
+	// Setiap row = 1 transfer dengan cost basis & chick_in_date sendiri (per source). Order:
+	// effective_date ASC, id ASC (kronologis).
+	GetAllTransferInputsByProjectFlockKandangID(ctx context.Context, projectFlockKandangId uint, period time.Time) ([]HppV2LatestTransferInputRow, error)
 	GetManualDepreciationInputByProjectFlockID(ctx context.Context, projectFlockID uint) (*HppV2ManualDepreciationInputRow, error)
 	GetRecordingStockRoutingAdjustmentCostByProjectFlockID(ctx context.Context, projectFlockID uint, periodDate time.Time) (float64, error)
 	GetFarmDepreciationSnapshotByProjectFlockIDAndPeriod(ctx context.Context, projectFlockID uint, periodDate time.Time) (*HppV2FarmDepreciationSnapshotRow, error)
 	GetEarliestChickInDateByProjectFlockID(ctx context.Context, projectFlockID uint) (*time.Time, error)
-	GetDepreciationPercents(ctx context.Context, houseTypes []string, maxDay int) (map[string]map[int]float64, error)
+	GetChickinPopulationByPFKForFarm(ctx context.Context, projectFlockID uint) (map[uint]float64, error)
+	GetMultiplicationPercentages(ctx context.Context, houseTypes []string, maxDay int) (map[string]map[int]float64, error)
 	ListUsageCostRowsByProductFlags(ctx context.Context, projectFlockKandangIDs []uint, flagNames []string, date *time.Time) ([]HppV2UsageCostRow, error)
 	ListAdjustmentCostRowsByProductFlags(ctx context.Context, projectFlockKandangIDs []uint, flagNames []string, date *time.Time) ([]HppV2AdjustmentCostRow, error)
 	ListExpenseRealizationRowsByProjectFlockKandangIDs(ctx context.Context, projectFlockKandangIDs []uint, date *time.Time, ekspedisi bool) ([]HppV2ExpenseCostRow, error)
@@ -230,6 +236,62 @@ LIMIT 1
 	return &row, nil
 }
 
+func (r *HppV2RepositoryImpl) GetAllTransferInputsByProjectFlockKandangID(
+	ctx context.Context,
+	projectFlockKandangId uint,
+	period time.Time,
+) ([]HppV2LatestTransferInputRow, error) {
+	var rows []HppV2LatestTransferInputRow
+	query := `
+WITH latest_transfer_approval AS (
+	SELECT a.approvable_id, a.action
+	FROM approvals a
+	JOIN (
+		SELECT approvable_id, MAX(action_at) AS latest_action_at
+		FROM approvals
+		WHERE approvable_type = @approval_type
+		GROUP BY approvable_id
+	) la
+		ON la.approvable_id = a.approvable_id
+		AND la.latest_action_at = a.action_at
+	WHERE a.approvable_type = @approval_type
+),
+approved_transfers AS (
+	SELECT
+		lt.id,
+		lt.from_project_flock_id,
+		COALESCE(DATE(lt.effective_move_date), DATE(lt.economic_cutoff_date), DATE(lt.transfer_date)) AS effective_date
+	FROM laying_transfers lt
+	JOIN latest_transfer_approval lta ON lta.approvable_id = lt.id
+	WHERE lt.deleted_at IS NULL
+	  AND lt.executed_at IS NOT NULL
+	  AND lta.action = 'APPROVED'
+)
+SELECT
+	ltt.target_project_flock_kandang_id AS project_flock_kandang_id,
+	at.from_project_flock_id AS source_project_flock_id,
+	at.effective_date AS transfer_date,
+	ltt.total_qty AS transfer_qty,
+	at.id AS transfer_id
+FROM laying_transfer_targets ltt
+JOIN approved_transfers at ON at.id = ltt.laying_transfer_id
+WHERE ltt.deleted_at IS NULL
+  AND ltt.target_project_flock_kandang_id = @project_flock_kandang_id
+  AND at.effective_date <= DATE(@period_date)
+ORDER BY at.effective_date ASC, at.id ASC
+`
+
+	err := r.db.WithContext(ctx).Raw(query, map[string]any{
+		"approval_type":            utils.ApprovalWorkflowTransferToLaying.String(),
+		"project_flock_kandang_id": projectFlockKandangId,
+		"period_date":              period,
+	}).Scan(&rows).Error
+	if err != nil {
+		return nil, err
+	}
+	return rows, nil
+}
+
 func (r *HppV2RepositoryImpl) GetManualDepreciationInputByProjectFlockID(
 	ctx context.Context,
 	projectFlockID uint,
@@ -373,7 +435,34 @@ func (r *HppV2RepositoryImpl) GetEarliestChickInDateByProjectFlockID(ctx context
 	return selected.ChickInDate, nil
 }
 
-func (r *HppV2RepositoryImpl) GetDepreciationPercents(
+func (r *HppV2RepositoryImpl) GetChickinPopulationByPFKForFarm(
+	ctx context.Context,
+	projectFlockID uint,
+) (map[uint]float64, error) {
+	type row struct {
+		ProjectFlockKandangID uint    `gorm:"column:project_flock_kandang_id"`
+		TotalQty              float64 `gorm:"column:total_qty"`
+	}
+	var rows []row
+	err := r.db.WithContext(ctx).
+		Table("project_chickins AS pc").
+		Select("pc.project_flock_kandang_id, SUM(pc.usage_qty) AS total_qty").
+		Joins("JOIN project_flock_kandangs AS pfk ON pfk.id = pc.project_flock_kandang_id").
+		Where("pc.deleted_at IS NULL").
+		Where("pfk.project_flock_id = ?", projectFlockID).
+		Group("pc.project_flock_kandang_id").
+		Scan(&rows).Error
+	if err != nil {
+		return nil, err
+	}
+	result := make(map[uint]float64, len(rows))
+	for _, x := range rows {
+		result[x.ProjectFlockKandangID] = x.TotalQty
+	}
+	return result, nil
+}
+
+func (r *HppV2RepositoryImpl) GetMultiplicationPercentages(
 	ctx context.Context,
 	houseTypes []string,
 	maxDay int,
@@ -384,19 +473,19 @@ func (r *HppV2RepositoryImpl) GetDepreciationPercents(
 	}
 
 	type row struct {
-		HouseType           string
-		Day                 int
-		DepreciationPercent float64
+		HouseType                string
+		Day                      int
+		MultiplicationPercentage float64
 	}
 
 	rows := make([]row, 0)
-	err := r.db.WithContext(ctx).
-		Table("house_depreciation_standards").
-		Select("house_type::text AS house_type, day, depreciation_percent").
-		Where("house_type::text IN ?", houseTypes).
-		Where("day <= ?", maxDay).
-		Order("house_type ASC, day ASC").
-		Scan(&rows).Error
+	err := r.db.WithContext(ctx).Raw(`
+		SELECT DISTINCT ON (house_type::text, day)
+			house_type::text AS house_type, day, multiplication_percentage
+		FROM house_depreciation_standards
+		WHERE house_type::text IN ? AND day <= ?
+		ORDER BY house_type, day, effective_date DESC NULLS LAST
+	`, houseTypes, maxDay).Scan(&rows).Error
 	if err != nil {
 		return nil, err
 	}
@@ -405,7 +494,7 @@ func (r *HppV2RepositoryImpl) GetDepreciationPercents(
 		if _, exists := result[item.HouseType]; !exists {
 			result[item.HouseType] = make(map[int]float64)
 		}
-		result[item.HouseType][item.Day] = item.DepreciationPercent
+		result[item.HouseType][item.Day] = item.MultiplicationPercentage
 	}
 
 	return result, nil

internal/common/service/common.depreciation.service.go

@@ -6,8 +6,8 @@ import (
 )
 
 const (
-	depreciationStartAgeDayCloseHouse = 155
-	depreciationStartAgeDayOpenHouse  = 176
+	depreciationStartAgeDayCloseHouse = 175
+	depreciationStartAgeDayOpenHouse  = 175
 )
 
 func NormalizeDepreciationHouseType(raw string) string {
@@ -26,8 +26,8 @@ func DepreciationStartAgeDay(houseType string) int {
 }
 
 func FlockAgeDay(originDate time.Time, periodDate time.Time) int {
-	origin := time.Date(originDate.Year(), originDate.Month(), originDate.Day(), 0, 0, 0, 0, originDate.Location())
-	period := time.Date(periodDate.Year(), periodDate.Month(), periodDate.Day(), 0, 0, 0, 0, periodDate.Location())
+	origin := time.Date(originDate.Year(), originDate.Month(), originDate.Day(), 0, 0, 0, 0, time.UTC)
+	period := time.Date(periodDate.Year(), periodDate.Month(), periodDate.Day(), 0, 0, 0, 0, time.UTC)
 	if period.Before(origin) {
 		return 0
 	}
@@ -47,9 +47,9 @@ func CalculateDepreciationAtDayN(
 	initialPulletCost float64,
 	dayN int,
 	houseType string,
-	percentByHouseType map[string]map[int]float64,
+	multiplicationByHouseType map[string]map[int]float64,
 ) (float64, float64, float64) {
-	return CalculateDepreciationFromDayRange(initialPulletCost, 1, dayN, houseType, percentByHouseType)
+	return CalculateDepreciationFromDayRange(initialPulletCost, 1, dayN, houseType, multiplicationByHouseType)
 }
 
 func CalculateDepreciationFromDayRange(
@@ -57,8 +57,8 @@ func CalculateDepreciationFromDayRange(
 	startDay int,
 	endDay int,
 	houseType string,
-	percentByHouseType map[string]map[int]float64,
-) (float64, float64, float64) {
+	multiplicationByHouseType map[string]map[int]float64,
+) (pulletCostDayN, depreciationValue, multiplicationPercentage float64) {
 	if initialPulletCost <= 0 || endDay <= 0 {
 		return 0, 0, 0
 	}
@@ -70,30 +70,30 @@ func CalculateDepreciationFromDayRange(
 	}
 
 	normalizedHouseType := NormalizeDepreciationHouseType(houseType)
-	housePercent, exists := percentByHouseType[normalizedHouseType]
+	houseMult, exists := multiplicationByHouseType[normalizedHouseType]
 	if !exists {
 		return 0, 0, 0
 	}
 
 	current := initialPulletCost
-	pulletCostDayN := 0.0
-	depreciationValue := 0.0
-	depreciationPercent := 0.0
 	for day := startDay; day <= endDay; day++ {
-		pct := housePercent[day]
-		dep := current * (pct / 100)
+		mult, ok := houseMult[day]
+		if !ok {
+			// No standard for this day → assume no depreciation (mult=1).
+			mult = 1.0
+		}
 		if day == endDay {
 			pulletCostDayN = current
-			depreciationValue = dep
-			depreciationPercent = pct
+			multiplicationPercentage = mult
+			depreciationValue = current * (1.0 - mult)
 		}
-		current -= dep
+		current = current * mult
 		if current < 0 {
 			current = 0
 		}
 	}
 
-	return pulletCostDayN, depreciationValue, depreciationPercent
+	return pulletCostDayN, depreciationValue, multiplicationPercentage
 }
 
 func CalculateEffectiveDepreciationPercent(totalDepreciationValue, totalPulletCostDayN float64) float64 {

internal/common/service/common.hppv2.service.go

@@ -1191,26 +1191,72 @@ func (s *hppV2Service) getDepreciationComponent(
 		}, nil
 	}
 
-	if totalPulletCost <= 0 {
-		return nil, nil
-	}
-
-	transferInput, err := s.hppRepo.GetLatestTransferInputByProjectFlockKandangID(context.Background(), projectFlockKandangId, periodDate)
+	// Multi-source support: 1 target kandang bisa menerima dari MULTIPLE transfer terpisah
+	// (tiap transfer = 1 source kandang). Depresiasi per target = SUM dari per-transfer depresiasi.
+	// Setiap transfer dihitung dengan chick_in_date source-nya sendiri dan cost basis pro-rated
+	// berdasarkan qty share (transfer.qty / totalTransferQty).
+	transferInputs, err := s.hppRepo.GetAllTransferInputsByProjectFlockKandangID(context.Background(), projectFlockKandangId, periodDate)
 	if err != nil {
 		return nil, err
 	}
 
-	var part *HppV2ComponentPart
-	if transferInput != nil && transferInput.SourceProjectFlockID > 0 {
-		part, err = s.buildNormalTransferDepreciationPart(contextRow, transferInput, periodDate, totalPulletCost)
-		if err != nil {
-			return nil, err
+	// Filter valid transfers (punya source flock id)
+	validTransfers := make([]commonRepo.HppV2LatestTransferInputRow, 0, len(transferInputs))
+	totalTransferQty := 0.0
+	for _, t := range transferInputs {
+		if t.SourceProjectFlockID == 0 {
+			continue
 		}
-	} else {
-		part, err = s.buildManualCutoverDepreciationPart(projectFlockKandangId, contextRow, periodDate, totalPulletCost)
-		if err != nil {
-			return nil, err
+		validTransfers = append(validTransfers, t)
+		totalTransferQty += t.TransferQty
+	}
+
+	if len(validTransfers) > 0 {
+		if totalPulletCost <= 0 {
+			return nil, nil
 		}
+
+		totalDepreciation := 0.0
+		parts := make([]HppV2ComponentPart, 0, len(validTransfers))
+		for i := range validTransfers {
+			t := validTransfers[i]
+			// Pro-rate cost basis per transfer berdasarkan qty share.
+			// CATATAN: pendekatan ini AKURAT kalau cost per ekor sama antar source flock.
+			// Kalau cost per ekor berbeda signifikan antar source, follow-up: refactor
+			// `buildGrowingUsagePart` untuk multi-source-flock cost computation.
+			transferCostBasis := totalPulletCost
+			if totalTransferQty > 0 && len(validTransfers) > 1 {
+				transferCostBasis = totalPulletCost * (t.TransferQty / totalTransferQty)
+			}
+
+			part, partErr := s.buildNormalTransferDepreciationPart(contextRow, &t, periodDate, transferCostBasis)
+			if partErr != nil {
+				return nil, partErr
+			}
+			if part == nil {
+				continue
+			}
+			totalDepreciation += part.Total
+			parts = append(parts, *part)
+		}
+
+		if len(parts) == 0 {
+			return nil, nil
+		}
+
+		return &HppV2Component{
+			Code:   hppV2ComponentDepreciation,
+			Title:  "Depreciation",
+			Scopes: []string{hppV2ScopeProductionCost},
+			Total:  totalDepreciation,
+			Parts:  parts,
+		}, nil
+	}
+
+	// Fallback: manual cut-over (kandang tanpa transfer record)
+	part, err := s.buildManualCutoverDepreciationPart(projectFlockKandangId, contextRow, periodDate, totalPulletCost)
+	if err != nil {
+		return nil, err
 	}
 	if part == nil {
 		return nil, nil
@@ -1344,20 +1390,22 @@ func (s *hppV2Service) buildNormalTransferDepreciationPart(
 	}
 
 	houseType := NormalizeDepreciationHouseType(contextRow.HouseType)
-	percentByHouseType, err := s.hppRepo.GetDepreciationPercents(context.Background(), []string{houseType}, scheduleDay)
+	multiplicationByHouseType, err := s.hppRepo.GetMultiplicationPercentages(context.Background(), []string{houseType}, scheduleDay)
 	if err != nil {
 		return nil, err
 	}
 
-	pulletCostDayN, depreciationValue, depreciationPercent := CalculateDepreciationAtDayN(
+	pulletCostDayN, depreciationValue, multiplicationPercentage := CalculateDepreciationAtDayN(
 		totalPulletCost,
 		scheduleDay,
 		contextRow.HouseType,
-		percentByHouseType,
+		multiplicationByHouseType,
 	)
-	if depreciationValue <= 0 {
+	if depreciationValue <= 0 && pulletCostDayN <= 0 {
 		return nil, nil
 	}
+	totalValueAfter := pulletCostDayN * multiplicationPercentage
+	depreciationPercent := (1.0 - multiplicationPercentage) * 100.0
 
 	return &HppV2ComponentPart{
 		Code:   hppV2PartDepreciationNormal,
@@ -1365,13 +1413,15 @@ func (s *hppV2Service) buildNormalTransferDepreciationPart(
 		Scopes: []string{hppV2ScopeProductionCost},
 		Total:  depreciationValue,
 		Details: map[string]any{
-			"basis_total":             totalPulletCost,
-			"pullet_cost_day_n":       pulletCostDayN,
-			"depreciation_percent":    depreciationPercent,
-			"schedule_day":            scheduleDay,
-			"origin_date":             formatDateOnly(*originDate),
-			"transfer_date":           formatDateOnly(transferInput.TransferDate),
-			"source_project_flock_id": transferInput.SourceProjectFlockID,
+			"basis_total":                           totalPulletCost,
+			"pullet_cost_day_n":                     pulletCostDayN,
+			"multiplication_percentage":             multiplicationPercentage,
+			"total_value_pullet_after_depreciation": totalValueAfter,
+			"depreciation_percent":                  depreciationPercent,
+			"schedule_day":                          scheduleDay,
+			"origin_date":                           formatDateOnly(*originDate),
+			"transfer_date":                         formatDateOnly(transferInput.TransferDate),
+			"source_project_flock_id":               transferInput.SourceProjectFlockID,
 		},
 		References: []HppV2Reference{
 			{
@@ -1392,7 +1442,7 @@ func (s *hppV2Service) buildManualCutoverDepreciationPart(
 	periodDate time.Time,
 	totalPulletCost float64,
 ) (*HppV2ComponentPart, error) {
-	if contextRow == nil || totalPulletCost <= 0 {
+	if contextRow == nil {
 		return nil, nil
 	}
 
@@ -1407,6 +1457,21 @@ func (s *hppV2Service) buildManualCutoverDepreciationPart(
 		return nil, nil
 	}
 
+	populations, err := s.hppRepo.GetChickinPopulationByPFKForFarm(context.Background(), contextRow.ProjectFlockID)
+	if err != nil {
+		return nil, err
+	}
+	var totalPopulation float64
+	for _, qty := range populations {
+		totalPopulation += qty
+	}
+	kandangPopulation := populations[projectFlockKandangId]
+	if totalPopulation <= 0 || kandangPopulation <= 0 {
+		return nil, nil
+	}
+	populationShare := kandangPopulation / totalPopulation
+	basis := manualInput.TotalCost * populationShare
+
 	originDate, err := s.hppRepo.GetEarliestChickInDateByProjectFlockID(context.Background(), contextRow.ProjectFlockID)
 	if err != nil {
 		return nil, err
@@ -1427,21 +1492,24 @@ func (s *hppV2Service) buildManualCutoverDepreciationPart(
 	}
 
 	houseType := NormalizeDepreciationHouseType(contextRow.HouseType)
-	percentByHouseType, err := s.hppRepo.GetDepreciationPercents(context.Background(), []string{houseType}, reportScheduleDay)
+	multiplicationByHouseType, err := s.hppRepo.GetMultiplicationPercentages(context.Background(), []string{houseType}, reportScheduleDay)
 	if err != nil {
 		return nil, err
 	}
 
-	pulletCostDayN, depreciationValue, depreciationPercent := CalculateDepreciationFromDayRange(
-		totalPulletCost,
+	pulletCostDayN, depreciationValue, multiplicationPercentage := CalculateDepreciationFromDayRange(
+		basis,
 		startDay,
 		reportScheduleDay,
 		contextRow.HouseType,
-		percentByHouseType,
+		multiplicationByHouseType,
 	)
-	if depreciationValue <= 0 {
+	if depreciationValue <= 0 && pulletCostDayN <= 0 {
 		return nil, nil
 	}
+	totalValueAfter := pulletCostDayN * multiplicationPercentage
+	depreciationPercent := (1.0 - multiplicationPercentage) * 100.0
+	_ = totalPulletCost
 
 	return &HppV2ComponentPart{
 		Code:   hppV2PartDepreciationCutover,
@@ -1449,15 +1517,19 @@ func (s *hppV2Service) buildManualCutoverDepreciationPart(
 		Scopes: []string{hppV2ScopeProductionCost},
 		Total:  depreciationValue,
 		Details: map[string]any{
-			"basis_total":           totalPulletCost,
-			"pullet_cost_day_n":     pulletCostDayN,
-			"depreciation_percent":  depreciationPercent,
-			"schedule_day":          reportScheduleDay,
-			"start_schedule_day":    startDay,
-			"origin_date":           formatDateOnly(*originDate),
-			"cutover_date":          formatDateOnly(manualInput.CutoverDate),
-			"manual_input_id":       manualInput.ID,
-			"project_flock_kandang": projectFlockKandangId,
+			"basis_total":                           basis,
+			"manual_input_total":                    manualInput.TotalCost,
+			"population_share":                      populationShare,
+			"pullet_cost_day_n":                     pulletCostDayN,
+			"multiplication_percentage":             multiplicationPercentage,
+			"total_value_pullet_after_depreciation": totalValueAfter,
+			"depreciation_percent":                  depreciationPercent,
+			"schedule_day":                          reportScheduleDay,
+			"start_schedule_day":                    startDay,
+			"origin_date":                           formatDateOnly(*originDate),
+			"cutover_date":                          formatDateOnly(manualInput.CutoverDate),
+			"manual_input_id":                       manualInput.ID,
+			"project_flock_kandang":                 projectFlockKandangId,
 		},
 		References: []HppV2Reference{
 			{
@@ -1465,7 +1537,7 @@ func (s *hppV2Service) buildManualCutoverDepreciationPart(
 				ID:           manualInput.ID,
 				Date:         formatDateOnly(manualInput.CutoverDate),
 				Qty:          1,
-				Total:        totalPulletCost,
+				Total:        manualInput.TotalCost,
 				AppliedTotal: depreciationValue,
 			},
 		},
@@ -1724,7 +1796,7 @@ func partHasScope(part *HppV2ComponentPart, scope string) bool {
 }
 
 func dateOnly(value time.Time) time.Time {
-	return time.Date(value.Year(), value.Month(), value.Day(), 0, 0, 0, 0, value.Location())
+	return time.Date(value.Year(), value.Month(), value.Day(), 0, 0, 0, 0, time.UTC)
 }
 
 func formatDateOnly(value time.Time) string {

internal/common/service/common.hppv2.service_test.go

@@ -57,6 +57,14 @@ func (s *hppV2RepoStub) GetLatestTransferInputByProjectFlockKandangID(_ context.
 	return s.latestTransferByPFK[projectFlockKandangId], nil
 }
 
+func (s *hppV2RepoStub) GetAllTransferInputsByProjectFlockKandangID(_ context.Context, projectFlockKandangId uint, _ time.Time) ([]commonRepo.HppV2LatestTransferInputRow, error) {
+	row := s.latestTransferByPFK[projectFlockKandangId]
+	if row == nil {
+		return []commonRepo.HppV2LatestTransferInputRow{}, nil
+	}
+	return []commonRepo.HppV2LatestTransferInputRow{*row}, nil
+}
+
 func (s *hppV2RepoStub) GetManualDepreciationInputByProjectFlockID(_ context.Context, projectFlockID uint) (*commonRepo.HppV2ManualDepreciationInputRow, error) {
 	return s.manualInputByProject[projectFlockID], nil
 }
@@ -93,6 +101,18 @@ func (s *hppV2RepoStub) GetDepreciationPercents(_ context.Context, houseTypes []
 	return result, nil
 }
 
+// GetMultiplicationPercentages — alias yang sama dengan GetDepreciationPercents untuk match
+// interface HppV2CostRepository (interface dipakai method name baru ini).
+func (s *hppV2RepoStub) GetMultiplicationPercentages(ctx context.Context, houseTypes []string, maxDay int) (map[string]map[int]float64, error) {
+	return s.GetDepreciationPercents(ctx, houseTypes, maxDay)
+}
+
+// GetChickinPopulationByPFKForFarm — return populasi per PFK dari satu project flock.
+// Stub minimal: return empty map (depreciation manual cutover tidak di-test di sini).
+func (s *hppV2RepoStub) GetChickinPopulationByPFKForFarm(_ context.Context, _ uint) (map[uint]float64, error) {
+	return map[uint]float64{}, nil
+}
+
 func (s *hppV2RepoStub) ListUsageCostRowsByProductFlags(_ context.Context, projectFlockKandangIDs []uint, flagNames []string, _ *time.Time) ([]commonRepo.HppV2UsageCostRow, error) {
 	return append([]commonRepo.HppV2UsageCostRow{}, s.usageRowsByKey[stubKey(projectFlockKandangIDs, flagNames)]...), nil
 }