feat(BE): add excluded stockables support in FIFO allocation and fetching methods

internal/common/service/common.fifo.service.go

@@ -228,7 +228,13 @@ func (s *fifoService) Consume(ctx context.Context, req StockConsumeRequest) (*St
 
 		switch {
 		case delta > 0:
-			allocationRes, err := s.allocateFromStock(ctx, tx, productWarehouseID, req.UsableKey, req.UsableID, delta)
+
+			var excludedStockables []fifo.StockableKey
+			if cfg.ExcludedStockables != nil {
+				excludedStockables = cfg.ExcludedStockables
+			}
+
+			allocationRes, err := s.allocateFromStock(ctx, tx, productWarehouseID, req.UsableKey, req.UsableID, delta, excludedStockables)
 			if err != nil {
 				return err
 			}
@@ -410,8 +416,9 @@ func (s *fifoService) allocateFromStock(
 	usableKey fifo.UsableKey,
 	usableID uint,
 	requestQty float64,
+	excludedStockables []fifo.StockableKey,
 ) (*allocationOutcome, error) {
-	lots, err := s.fetchStockLots(ctx, tx, productWarehouseID)
+	lots, err := s.fetchStockLots(ctx, tx, productWarehouseID, excludedStockables)
 	if err != nil {
 		return nil, err
 	}
@@ -492,14 +499,24 @@ func (s *fifoService) allocateFromStock(
 	}, nil
 }
 
-func (s *fifoService) fetchStockLots(ctx context.Context, tx *gorm.DB, productWarehouseID uint) ([]stockLot, error) {
+func (s *fifoService) fetchStockLots(ctx context.Context, tx *gorm.DB, productWarehouseID uint, excludedStockables []fifo.StockableKey) ([]stockLot, error) {
 	configs := fifo.Stockables()
 	if len(configs) == 0 {
 		return nil, nil
 	}
 
+	// Create exclusion set for faster lookup
+	excludedSet := make(map[fifo.StockableKey]bool)
+	for _, key := range excludedStockables {
+		excludedSet[key] = true
+	}
+
 	var lots []stockLot
 	for key, cfg := range configs {
+		// Skip excluded stockables
+		if excludedSet[key] {
+			continue
+		}
 
 		usesNumericTime := cfg.Columns.CreatedAt == cfg.Columns.ID
 
@@ -616,7 +633,13 @@ func (s *fifoService) resolvePendingForWarehouse(ctx context.Context, tx *gorm.D
 			continue
 		}
 
-		outcome, err := s.allocateFromStock(ctx, tx, productWarehouseID, candidate.UsableKey, candidate.UsableID, candidate.Pending)
+		// Get excluded stockables from candidate usable config
+		var excludedStockables []fifo.StockableKey
+		if candidate.Config.ExcludedStockables != nil {
+			excludedStockables = candidate.Config.ExcludedStockables
+		}
+
+		outcome, err := s.allocateFromStock(ctx, tx, productWarehouseID, candidate.UsableKey, candidate.UsableID, candidate.Pending, excludedStockables)
 		if err != nil {
 			return nil, err
 		}

internal/utils/fifo/registry.go

@@ -54,11 +54,12 @@ type StockableConfig struct {
 
 // UsableConfig registers a table that consumes stock (recordings, adjustments, sales, etc).
 type UsableConfig struct {
-	Key     UsableKey
+	Key                UsableKey
-	Table   string
+	Table              string
-	Columns UsableColumns
+	Columns            UsableColumns
-	OrderBy []string
+	OrderBy            []string
-	Scope   QueryScope
+	Scope              QueryScope
+	ExcludedStockables []StockableKey // Stockables to exclude when consuming stock
 }
 
 var (