fix

backend/pkg/models/participants.go

@@ -1,11 +1,13 @@
 package models
 
+import "time"
+
 type Participant struct {
 	ID      uint64 `gorm:"column:id"`
 	UserID  uint64 `gorm:"column:user_id" json:"user_id,omitempty"`
 	EventID uint64 `gorm:"column:event_id" json:"event_id,omitempty"`
 	Status  string `gorm:"column:status" json:"status,omitempty"`
-
+	CreatedAt time.Time `gorm:"column:created_at"`
 	User  User
 	Event Event
 }

backend/pkg/services/event/participant.go

@@ -2,6 +2,7 @@ package event
 
 import (
 	"context"
+	"time"
 
 	"github.com/BrosSquad/go-collect/pb"
 	"github.com/BrosSquad/go-collect/pkg/models"
@@ -23,6 +24,7 @@ func (service *ParticipantService) Evident(ctx context.Context, request pb.Parti
 		UserID:  request.UserId,
 		EventID: request.EventId,
 		Status: "in",
+		CreatedAt: time.Now(),
 	}
 
 	result := service.db.Save(&model)