feat[BE]: enhance expense management with location and project flock integration, including updates to migrations, entities, services, and validations

internal/entities/expense.go

@@ -12,6 +12,8 @@ type Expense struct {
 	SupplierId              uint64         `gorm:""`
 	Category                string         `gorm:"type:varchar(50);not null"`
 	PoNumber                string         `gorm:"type:varchar(50)"`
+	LocationId              uint64         `gorm:"not null"`
+	ProjectFlockId          *string        `gorm:"type:json"`
 	RealizationDate         time.Time      `gorm:"type:date;column:realization_date"`
 	TransactionDate         time.Time      `gorm:"type:date;not null"`
 	Notes                   string         `gorm:"type:text;column:notes"`
@@ -21,6 +23,7 @@ type Expense struct {
 	DeletedAt               gorm.DeletedAt `gorm:"index" json:"-"`
 
 	Supplier             *Supplier         `gorm:"foreignKey:SupplierId;references:Id"`
+	Location             *Location         `gorm:"foreignKey:LocationId;references:Id"`
 	CreatedUser          *User             `gorm:"foreignKey:CreatedBy;references:Id"`
 	Nonstocks            []ExpenseNonstock `gorm:"foreignKey:ExpenseId;references:Id"`
 	Documents            []Document        `gorm:"foreignKey:DocumentableId;references:Id"`