fix(entity): complete PiggyBank and ReqKindBox entities

entity/piggy_bank.go

@@ -5,6 +5,8 @@ import "time"
 type PiggyBank struct {
 	ID              uint
 	TotalAmount     uint
+	RecieverId      uint
+	SenderId        uint
 	SerialNumber    string
 	Status          uint
 	StatusChangedAt *time.Time

entity/reqkindbox.go

@@ -8,4 +8,5 @@ type ReqKindBox struct {
 	NikokarId      uint
 	Status         uint
 	Description    string
+	StatusChangedAt *time.Time
 }