diff --git a/initialize/migrate/database/02139_invite_gift_days.down.sql b/initialize/migrate/database/02139_invite_gift_days.down.sql
new file mode 100644
index 0000000..3203bf9
--- /dev/null
+++ b/initialize/migrate/database/02139_invite_gift_days.down.sql
@@ -0,0 +1,4 @@
+DELETE
+FROM `system`
+WHERE `category` = 'invite'
+  AND `key` = 'GiftDays';
diff --git a/initialize/migrate/database/02139_invite_gift_days.up.sql b/initialize/migrate/database/02139_invite_gift_days.up.sql
new file mode 100644
index 0000000..a33752c
--- /dev/null
+++ b/initialize/migrate/database/02139_invite_gift_days.up.sql
@@ -0,0 +1,14 @@
+INSERT INTO `system` (`category`, `key`, `value`, `type`, `desc`, `created_at`, `updated_at`)
+SELECT 'invite',
+       'GiftDays',
+       '3',
+       'int',
+       'Invite gift days',
+       NOW(3),
+       NOW(3)
+WHERE NOT EXISTS (
+    SELECT 1
+    FROM `system`
+    WHERE `category` = 'invite'
+      AND `key` = 'GiftDays'
+);
diff --git a/internal/logic/admin/system/updateInviteConfigLogic.go b/internal/logic/admin/system/updateInviteConfigLogic.go
index 8e2201f..9a96bcf 100644
--- a/internal/logic/admin/system/updateInviteConfigLogic.go
+++ b/internal/logic/admin/system/updateInviteConfigLogic.go
@@ -43,11 +43,26 @@ func (l *UpdateInviteConfigLogic) UpdateInviteConfig(req *types.InviteConfig) er
 			fieldName := t.Field(i).Name
 			// Get the field value to string
 			fieldValue := tool.ConvertValueToString(v.Field(i))
-			// Update the invite config
-			err = db.Model(&system.System{}).Where("`category` = 'invite' and `key` = ?", fieldName).Update("value", fieldValue).Error
+			// Update existing row; if missing (RowsAffected=0), create it to avoid silent config loss.
+			updateResult := db.Model(&system.System{}).
+				Where("`category` = 'invite' and `key` = ?", fieldName).
+				Update("value", fieldValue)
+			err = updateResult.Error
 			if err != nil {
 				break
 			}
+			if updateResult.RowsAffected == 0 {
+				err = db.Create(&system.System{
+					Category: "invite",
+					Key:      fieldName,
+					Value:    fieldValue,
+					Type:     getSystemFieldType(v.Field(i)),
+					Desc:     "invite config: " + fieldName,
+				}).Error
+				if err != nil {
+					break
+				}
+			}
 		}
 		if err != nil {
 			return err
@@ -62,3 +77,24 @@ func (l *UpdateInviteConfigLogic) UpdateInviteConfig(req *types.InviteConfig) er
 	initialize.Invite(l.svcCtx)
 	return nil
 }
+
+func getSystemFieldType(field reflect.Value) string {
+	kind := field.Kind()
+	if kind == reflect.Ptr && !field.IsNil() {
+		kind = field.Elem().Kind()
+	}
+	switch kind {
+	case reflect.Bool:
+		return "bool"
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return "int"
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return "uint"
+	case reflect.Float32, reflect.Float64:
+		return "float"
+	case reflect.String:
+		return "string"
+	default:
+		return "string"
+	}
+}
diff --git a/ppanel.json b/ppanel.json
index 2b9464f..b08bf4c 100644
--- a/ppanel.json
+++ b/ppanel.json
@@ -5043,13 +5043,18 @@
         "only_first_purchase": {
           "type": "boolean",
           "format": "boolean"
+        },
+        "gift_days": {
+          "type": "integer",
+          "format": "int64"
         }
       },
       "title": "GetInviteConfigResponse",
       "required": [
         "forced_invite",
         "referral_percentage",
-        "only_first_purchase"
+        "only_first_purchase",
+        "gift_days"
       ]
     },
     "GetListByPageRequest": {
@@ -6383,13 +6388,18 @@
         "only_first_purchase": {
           "type": "boolean",
           "format": "boolean"
+        },
+        "gift_days": {
+          "type": "integer",
+          "format": "int64"
         }
       },
       "title": "UpdateInviteConfigRequest",
       "required": [
         "forced_invite",
         "referral_percentage",
-        "only_first_purchase"
+        "only_first_purchase",
+        "gift_days"
       ]
     },
     "UpdateNodeConfigRequest": {