letter outgoint attachment

internal/entities/letter_outgoing.go

@@ -76,6 +76,7 @@ type LetterOutgoingAttachment struct {
 	FileType       string     `gorm:"not null" json:"file_type"`
 	UploadedBy     *uuid.UUID `json:"uploaded_by,omitempty"`
 	UploadedAt     time.Time  `gorm:"autoCreateTime" json:"uploaded_at"`
+	IsFinal        bool       `gorm:"default:false" json:"is_final"`
 }
 
 func (LetterOutgoingAttachment) TableName() string { return "letter_outgoing_attachments" }