feat(BE-47,48,49,50): implement inventory adjustment system

- Extend DB schema with product_warehouses and stock_logs tables
- Implement stock adjustment API (increase/decrease operations)
- Add comprehensive validation for all adjustment operations
- Implement audit log system for each adjustment with history tracking
- Include transaction handling, DTOs, seeders, and proper error handling
- Add adjustment history API with pagination and filtering

TODO: Integration testing pending

internal/modules/inventory/product-warehouses/controllers/product_warehouse.controller.go

@@ -26,7 +26,6 @@ func (u *ProductWarehouseController) GetAll(c *fiber.Ctx) error {
 	query := &validation.Query{
 		Page:        c.QueryInt("page", 1),
 		Limit:       c.QueryInt("limit", 10),
-		Search:      c.Query("search", ""),
 		ProductId:   uint(c.QueryInt("product_id", 0)),
 		WarehouseId: uint(c.QueryInt("warehouse_id", 0)),
 	}

internal/modules/inventory/product-warehouses/dto/product_warehouse.dto.go

@@ -13,7 +13,7 @@ type ProductWarehouseBaseDTO struct {
 	Id          uint `json:"id"`
 	ProductId   uint `json:"product_id"`
 	WarehouseId uint `json:"warehouse_id"`
-	Quantity    int  `json:"quantity"`
+	Quantity    float64  `json:"quantity"`
 }
 
 type ProductWarehouseListDTO struct {

internal/modules/inventory/product-warehouses/repositories/product_warehouse.repository.go

@@ -14,6 +14,7 @@ type ProductWarehouseRepository interface {
 	IsProductExist(ctx context.Context, productId uint) (bool, error)
 	IsWarehouseExist(ctx context.Context, warehouseId uint) (bool, error)
 	ExistsByID(ctx context.Context, id uint) (bool, error)
+	GetProductWarehouseByProductAndWarehouseID(ctx context.Context, productId, warehouseId uint) (*entity.ProductWarehouse, error)
 }
 
 type ProductWarehouseRepositoryImpl struct {
@@ -51,3 +52,11 @@ func (r *ProductWarehouseRepositoryImpl) IsWarehouseExist(ctx context.Context, w
 func (r *ProductWarehouseRepositoryImpl) ExistsByID(ctx context.Context, id uint) (bool, error) {
 	return repository.Exists[entity.ProductWarehouse](ctx, r.db, id)
 }
+
+func (r *ProductWarehouseRepositoryImpl) GetProductWarehouseByProductAndWarehouseID(ctx context.Context, productId, warehouseId uint) (*entity.ProductWarehouse, error) {
+	var productWarehouse entity.ProductWarehouse
+	if err := r.DB().WithContext(ctx).Where("product_id = ? AND warehouse_id = ?", productId, warehouseId).First(&productWarehouse).Error; err != nil {
+		return nil, err
+	}
+	return &productWarehouse, nil
+}

internal/modules/inventory/product-warehouses/services/product_warehouse.service.go

@@ -58,13 +58,6 @@ func (s productWarehouseService) GetAll(c *fiber.Ctx, params *validation.Query)
 			db = db.Where("warehouse_id = ?", params.WarehouseId)
 		}
 
-		// Search in related product or warehouse names
-		if params.Search != "" {
-			db = db.Joins("LEFT JOIN products ON products.id = product_warehouse.product_id").
-				Joins("LEFT JOIN warehouses ON warehouses.id = product_warehouse.warehouse_id").
-				Where("products.name ILIKE ? OR warehouses.name ILIKE ?", "%"+params.Search+"%", "%"+params.Search+"%")
-		}
-
 		return db.Order("created_at DESC").Order("updated_at DESC")
 	})
 

internal/modules/inventory/product-warehouses/validations/product_warehouse.validation.go

@@ -1,21 +1,20 @@
 package validation
 
 type Create struct {
-	ProductId   uint `json:"product_id" validate:"required,number,min=1"`
-	WarehouseId uint `json:"warehouse_id" validate:"required,number,min=1"`
-	Quantity    int  `json:"quantity" validate:"required,number,min=0"`
+	ProductId   uint    `json:"product_id" validate:"required,number,min=1"`
+	WarehouseId uint    `json:"warehouse_id" validate:"required,number,min=1"`
+	Quantity    float64 `json:"quantity" validate:"required,number,min=0"`
 }
 
 type Update struct {
-	ProductId   *uint `json:"product_id,omitempty" validate:"omitempty,number,min=1"`
-	WarehouseId *uint `json:"warehouse_id,omitempty" validate:"omitempty,number,min=1"`
-	Quantity    *int  `json:"quantity,omitempty" validate:"omitempty,number,min=0"`
+	ProductId   *uint    `json:"product_id,omitempty" validate:"omitempty,number,min=1"`
+	WarehouseId *uint    `json:"warehouse_id,omitempty" validate:"omitempty,number,min=1"`
+	Quantity    *float64 `json:"quantity,omitempty" validate:"omitempty,number,min=0"`
 }
 
 type Query struct {
-	Page        int    `query:"page" validate:"omitempty,number,min=1"`
-	Limit       int    `query:"limit" validate:"omitempty,number,min=1,max=100"`
-	Search      string `query:"search" validate:"omitempty,max=50"`
-	ProductId   uint   `query:"product_id" validate:"omitempty,number,min=1"`
-	WarehouseId uint   `query:"warehouse_id" validate:"omitempty,number,min=1"`
+	Page        int  `query:"page" validate:"omitempty,number,min=1"`
+	Limit       int  `query:"limit" validate:"omitempty,number,min=1,max=100"`
+	ProductId   uint `query:"product_id" validate:"omitempty,number,min=1"`
+	WarehouseId uint `query:"warehouse_id" validate:"omitempty,number,min=1"`
 }