Added transaction feature, fixed some mistakes

backend/src/domain/transaction.go

@@ -0,0 +1,48 @@
+package domain
+
+import "time"
+
+type Transaction struct {
+	ID          int64
+	FamilyID    int64
+	Description *string
+	Type        string
+	DateTime    time.Time
+	Category    string
+	Amount      float64
+	CreatedAt   time.Time
+	CreatedBy   int64
+	ReceiptID   *int64
+}
+
+type CreateTransactionRequest struct {
+	FamilyID    int64
+	Description *string
+	Type        string
+	DateTime    time.Time
+	Category    string
+	Amount      float64
+	CreatedBy   int64
+	ReceiptID   *int64
+}
+
+type UpdateTransactionRequest struct {
+	Description   *string
+	Type          *string
+	DateTime      *time.Time
+	Category      *string
+	Amount        *float64
+	ReceiptID     *int64
+	DetachReceipt bool
+}
+
+type TransactionListFilter struct {
+	FamilyID  *int64
+	CreatedBy *int64
+	Type      *string
+	Category  *string
+	DateFrom  *time.Time
+	DateTo    *time.Time
+	Limit     int
+	Offset    int
+}