diff --git a/backend/models/models.go b/backend/models/models.go
index 0524c64..29eed3a 100644
--- a/backend/models/models.go
+++ b/backend/models/models.go
@@ -212,10 +212,12 @@ type Conversation struct {
 	MessageID  string         `gorm:"uniqueIndex;not null"`
 	Type       string         `gorm:"not null"`
 	Content    string         `gorm:"type:text"`
-	Direction  string         `gorm:"not null"` // inbound/outbound
-	Status     string         `gorm:"type:varchar(20)"` // sent, delivered, read, failed
+	Direction  string         `gorm:"not null"`               // inbound / outbound
+	Status     string         `gorm:"type:varchar(20)"`       // sent, delivered, read, failed
+	ParentID   *uint          `gorm:"index"`                  // lien vers le message parent (nullable)
 }
 
+
 func NewTextMessage(to string, body string) WhatsappMessage {
 	return WhatsappMessage{
 		MessagingProduct: "whatsapp",